To mitigate the impact of interdiffusion reactions between the silicide slurry and Ta12W alloy substrate during vacuum sintering process on the oxidation resistance of the silicide coating,a micro-arc oxidation pretre...To mitigate the impact of interdiffusion reactions between the silicide slurry and Ta12W alloy substrate during vacuum sintering process on the oxidation resistance of the silicide coating,a micro-arc oxidation pretreatment was employed to construct a Ta_(2)O_(5)ceramic layer on the Ta12W alloy surface.Subsequently,a slurry spraying-vacuum sintering method was used to prepare a Si-Cr-Ti-Zr coating on the pretreated substrate.Comparative studies were conducted on the microstructure,phase composition,and isothermal oxidation resistance(at 1600℃)of the as-prepared coatings with and without the micro-arc oxidation ceramic layer.The results show that the Ta_(2)O_(5)layer prepared at 400 V is more continuous and has smaller pores than that prepared at 350 V.After microarc oxidation pretreatment,the Si-Cr-Ti-Zr coating on Ta12W alloy consists of three distinct layers:an upper layer dominated by Ti_(5)Si_(3),Ta_(5)Si_(3),and ZrSi;a middle layer dominated by TaSi_(2);a coating/substrate interfacial reaction layer dominated by Ta_(5)Si_(3).Both the Si-Cr-Ti-Zr coatings with and without the Ta_(2)O_(5)ceramic layer do not fail after isothermal oxidation at 1600℃for 5 h.Notably,the addition of the Ta2O5 ceramic layer reduces the high-temperature oxidation rate of the coating.展开更多
A calcium zirconate crucible material with excellent performance was prepared by fixing the particle size proportion and exploring the addition of Y_(2)O_(3).The results show that Y^(3+)solid-dissolves into c-ZrO_(2)t...A calcium zirconate crucible material with excellent performance was prepared by fixing the particle size proportion and exploring the addition of Y_(2)O_(3).The results show that Y^(3+)solid-dissolves into c-ZrO_(2)to occupy the Zr^(4+)positions,leading to structural defects and promoting the sintering of calcium zirconate.Adding 0.5 wt.%Y_(2)O_(3)into calcium zirconate can enhance the modulus of rupture,reduce the thermal expansion coefficient,and improve the thermal shock resistance.Through high-temperature test,it is found that adding 0.5 wt.%Y_(2)O_(3)significantly improves the corrosion resistance of the sample.展开更多
The limited high-temperature oxidation resistance of Mg alloys is a key factor restricting their development and application.The addition of some rare earth elements(REs),owing to their unique physical and chemical pr...The limited high-temperature oxidation resistance of Mg alloys is a key factor restricting their development and application.The addition of some rare earth elements(REs),owing to their unique physical and chemical properties,can significantly enhance the oxidation resistance of Mg alloys.Based on our previous study,we conclude that REs such as Gd,Y,and Ce enhance the oxidation resistance of Mg-RE alloys.This article comprehensively reviews recent research progress on high-temperature oxidation behavior and the potential mechanism in Mg-RE alloys.Based on the thermodynamic and kinetic analyses,the evolution of the complex oxide system formed during the high-temperature oxidation of Mg-RE alloys is first summarized.The diffusion behavior and concentration control mechanisms of REs during the oxidation process and how these mechanisms affect the sustained growth of the oxide film and antioxidant properties were elucidated.Moreover,the different structures of the oxide films were classified,and their properties were discussed.Finally,this paper introduces the applications of commonly used REs in Mg alloys and frontier research on their oxidation mechanisms.Based on the above review,we propose that future research perspectives can be explored in terms of expanding the experimental temperature range for oxidation tests,optimizing the chemical composition by adding trace REs to study their synergistic mechanism,revealing the underlying oxidation mechanism through advanced in situ microscopic characterization methods,and investigating the mechanical properties of oxide films using diverse approaches.展开更多
TiB_(2)coatings can significantly enhance the high-temperature oxidation resistance of molybdenum,which would broaden the application range of molybdenum and alloys thereof.However,traditional methods for preparing Ti...TiB_(2)coatings can significantly enhance the high-temperature oxidation resistance of molybdenum,which would broaden the application range of molybdenum and alloys thereof.However,traditional methods for preparing TiB_(2)coatings have disadvantages such as high equipment costs,complicated processes,and highly toxic gas emissions.This paper proposes an environmentally friendly method,which requires inexpensive equipment and simple processing,for preparing TiB_(2)coating on molybdenum via electrophoretic deposition within Na3AlF6-based molten salts.The produced TiB_(2)layer had an approximate thickness of 60μm and exhibited high density,outstanding hardness(38.2 GPa)and robust adhesion strength(51 N).Additionally,high-temperature oxidation experiments revealed that,at900℃,the TiB_(2)coating provided effective protection to the molybdenum substrate against oxidation for 3 h.This result indicates that the TiB_(2)coating prepared on molybdenum using molten salt electrophoretic deposition possesses good high-temperature oxidation resistance.展开更多
In this study,the design,analysis,manufacturing,and testing of a 3D-printed conformal microstrip array antenna for high-temperature environments is presented.3D printing technology is used to fabricate a curved cerami...In this study,the design,analysis,manufacturing,and testing of a 3D-printed conformal microstrip array antenna for high-temperature environments is presented.3D printing technology is used to fabricate a curved ceramic substrate,and laser sintering and microdroplet spraying processes are used to add the conductive metal on the curved substrate.The problems of gain loss,bandwidth reduction,and frequency shift caused by high temperatures are addressed by using a proper antenna design,with parasitic patches,slots,and metal resonant cavities.The antenna prototype is characterized by the curved substrates and the conductive metals for the power dividers,the patch,and the ground plane;its performance is examined up to a temperature of 600℃in a muffle furnace and compared with the results from the numerical analysis.The results show that the antenna can effectively function at 600℃and even higher temperatures.展开更多
The austenite(γ)reversely transformed from lath martensite(LM),lath bainite(LB),granular bainite(GB)and pearlite+ferrite(P+F)in a high-strength steel was studied at high temperatures using in-situ electron backscatte...The austenite(γ)reversely transformed from lath martensite(LM),lath bainite(LB),granular bainite(GB)and pearlite+ferrite(P+F)in a high-strength steel was studied at high temperatures using in-situ electron backscatter diffraction(EBSD).The memory effect of initial γ significantly affects the nucleation of the reverted γ in LM and GB structures,while a weak influence on that of LB and P+F structures.This results in a significant difference in γ grain size after complete austenitization,with the first two obtaining larger γ grains while the latter two are relatively small.Crystallographic analysis revealed that the reverted γ with acicular morphology(γA),most of which maintained the same orientation with the prior γ,dominated the reaustenitization behavior of LM and GB structures through preferential nucleation within γ grains and coalesced growth modes.Although globular reverted γ(γ_(G))with random orientation or large deviation from the prior γ can nucleate at the grain boundaries or within the grains,it is difficult for it to grow and play a role in segmenting and refining the prior γ due to the inhibition of γ_(A) coalescing.For LB and P+F structures,the nucleation rate of intragranular γ_(G) increases with increasing temperature,and always shows a random orientation.These γ_(G) grains can coarsen simultaneously with the intergranular γ_(G),ultimately playing a role in jointly dividing and refining the finalγgrains.Research also found that the differences in the effects of four different microstructures on revertedγnucleation are closely related to the variant selection of the matrix structure,as well as the content and size of cementite(θ).High density of block boundaries induced by weakening of variant selection and many fineθformed in the lath are the key to promoting LB structure to obtain more intragranular γ_(G) formation,as well as the important role of the large-sized θ in P+F structure.展开更多
The suspension gap is a critical operational parameter for high-speed maglev trains and significantly impacts their aerodynamic performance.Based on an engineering prototype of the high-temperature superconducting(HTS...The suspension gap is a critical operational parameter for high-speed maglev trains and significantly impacts their aerodynamic performance.Based on an engineering prototype of the high-temperature superconducting(HTS)pinning maglev train,this study established a detailed three-dimensional model,and then the aerodynamic characteristics of the HTS maglev train at 600 km/h with suspension gaps of 10 mm,20 mm,and 30 mm were simulated based on the improved delayed detached eddy simulation(IDDES)turbulence model and SST kωtwo-equation.The results demonstrated that the underbody design of the HTS maglev train leads to unique aerodynamic drag and aerothermal distribution phenomena.The head car experiences the smallest drag,while the tail car experiences the largest.The aerothermal temperature on the train's bottom surface progressively increases from the head to the tail.Additionally,the U-shaped track significantly constrains the flow around the train body,forming strong vortex structures.As the suspension gap increases from 10 mm to 30 mm,the airflow velocity in the train-track gap rises,reducing the underbody pressure and decreasing the lift of the head car by 12.43%.The drag of the head car increases by 10.98%,primarily due to changes in pressure drag.Additionally,the temperature at the underbody of the tail car rises further due to significant airflow deceleration.These findings provide valuable insights for advancing the engineering design and application of the high-speed HTS maglev technology.展开更多
The high-temperature oxidation resistance of AISI 321 stainless steel used in solar thermal power heat exchangers determines its service life.In this study,aluminizing and subsequent laser shock peening(LSP)treatments...The high-temperature oxidation resistance of AISI 321 stainless steel used in solar thermal power heat exchangers determines its service life.In this study,aluminizing and subsequent laser shock peening(LSP)treatments were employed to improve the high-temperature oxidation resistance of AISI 321 stainless steel at 620°C.These two treatments decreased the oxidation rate of AISI 321 steel.Specifically,the optimal oxidation resistance was observed in aluminized steel before oxidation for 144 h owing to the increased entropy of the LSP-treated specimen.After 144 h,LSP-treated steel achieved the best oxidation resistance because of the formation of a protectiveα-Al2O3film.Moreover,the large amount of subgrain boundaries formed on the aluminized layer of the LSP-treated samples could act as short-circuit paths for the outward diffusion of Al,facilitating the rapid nucleation ofα-Al2O3.Meanwhile,the aluminized layer could isolate the contact between the oxidation environment and matrix,thereby decreasing the oxidation rate.Furthermore,the minimum oxidation parabolic constant was calculated for LSP-treated steel(6.45787×10^(-14)),which was 69.18%and 36.36%that of aluminized and 321 steel,respectively,during the entire oxidation process.Therefore,the combination of aluminizing and LSP treatments can improve the high-temperature oxidation resistance of 321 stainless steel,providing a new idea for its surface treatment to achieve a long service life at high temperatures.展开更多
Maintaining high piezoelectric response and piezoelectric temperature stability of lead-based piezoceramics is critical for applications under high-temperature environments.Unfortunately,the piezoelectric response of ...Maintaining high piezoelectric response and piezoelectric temperature stability of lead-based piezoceramics is critical for applications under high-temperature environments.Unfortunately,the piezoelectric response of lead-based piezoceramics shows strong temperature dependence.Herein,an innovative strategy was proposed to solve this problem.The method consisted of constructing“slush-like”polar states by introducing localized heterostructures in the tetragonal phase structure to lower the energy barriers.The presence of the tetragonal phase stabilized the domain structure,providing excellent temperature stability,while the localized heterostructures also flattened the free energy landscape and enhanced the piezo-electric response.The strategy was implemented by using 0.11Pb(In_(0.5)Nb_(0.5))O_(3)-0.89Pb(Hf_(0.47)Ti_(0.53))O_(3)(PIN-PHT)piezoceramics doped with heterovalent ion Nb^(5+)to form a“slush-like”polar state with strong in-teractions inside the ceramics.The piezoelectric response and relaxor behavior of the ceramics were then investigated using piezoelectric force microscopy to reveal the mapping relationship between the complex ferroelectric domain structure and both the piezoelectric response and temperature stability.At Nb5+doping amount of 0.8 mol%,the ceramics showed excellent comprehensive performances with d_(33)=764 pC/N,T_(c)=319.1℃,ε_(r)=3253.59,k_(p)=0.67,and tan δ=0.0122.At an external ambient temperature of 300℃,the d_(33) of PIN-PHT-0.8Nb^(5+) remained high at 734 pC/N,with piezoelectric performance retention of 96.1%,showing excellent temperature stability.Overall,a new path was proposed for developing Pb-based piezoceramics with both good piezoelectric response and high-temperature stability,promising to broaden the temperature range of high-temperature piezoceramics for various applications.展开更多
During the production processes of energy,metallurgy,chemical engineering,and other process industries,substantial high-temperature dustladen flue gas is generated.Asymmetric silicon carbide(SiC)membranes exhibit sign...During the production processes of energy,metallurgy,chemical engineering,and other process industries,substantial high-temperature dustladen flue gas is generated.Asymmetric silicon carbide(SiC)membranes exhibit significant potential in flue gas filtration since they enable direct filtration of high-temperature gas and facilitate thermal energy recovery.However,membrane particle penetration is a prevalent issue when constructing membrane layer directly on macroporous support,which contributes to a considerable mass transfer resistance.Herein,a novel hydrophobic modification strategy was developed to avoid the slurry penetration,thereby fabricating the asymmetric SiC membrane without the necessity of any intermediate or sacrificial layer.Firstly,the modifier concentration was adjusted to guarantee that the support was hydrophobic enough to prevent the slurry from penetrating.Subsequently,the slurry surface tension was fine-tuned by introducing ethanol to enhance the integrity of the SiC membrane.Furthermore,the effect of solid content was systematically investigated.It was demonstrated that the optimized SiC membranes obtained excellent gas permeance from 100.8 to 199.8 m^(3)·m^(-2)·h^(-1)·kPa^(-1)with the pore size ranging from 1.93 to 3.89μm.Also,the SiC membrane exhibited excellent stability for 24 h and achieved an excellent dust removal efficiency(99.99%)when filtering ultrafine dust particles(~300 nm)under high temperatures.This method effectively bridges the membrane particle penetration issue caused by the particle size disparity among different layers of the asymmetric membrane,establishing an efficient strategy to fabricate highpermeance SiC membranes applied in high-temperature dust-laden gas filtration.展开更多
While the enhancement of elastomer properties through nanofiller addition has been widely explored,developing high-performance elastomers for electrically insulating electromagnetic interference(EMI)shielding material...While the enhancement of elastomer properties through nanofiller addition has been widely explored,developing high-performance elastomers for electrically insulating electromagnetic interference(EMI)shielding materials using a simple approach remains crucial.In this study,high-performance composite silicone rubber(SR)elastomers were fabricated through a combination of straightforward physical mixing and chemical grafting approach.Specifically,the incorporation of components aluminum trioxide nanoparticles(n-Al_(2)O_(3))and reactive small molecule 2-isocyanoethyl acrylate(ICA)and 2-Amino-4-hydroxy-6-methylpyrimidine(UPY)into SR significantly improved both the mechanical strength and ther-mal resistance of the composites due to the synergistic effects of nanoparticles and hydrogen bonding.In addition,as flexible electronics become more complex and miniaturised,there is an increasing demand for stretchable electrically insulating EMI shielding materials.Liquid metal(LM)with extreme fluidity is ideal for the preparation of stretchable EMI shielding materials.By introducing LM,we prepared a stretchable electrically insulating EMI shielding material with a sandwich structure using a simple mechanical sintering and lamination process,and the EMI shielding properties of the material remained stable before and after stretching.The modified insulating layer has excellent elasticity and thermal stability,which en-sures the normal use of the composite EMI shielding material under high temperatures and mechanical deformation conditions.This research provides valuable insights into the development of shielding materials with high-performance electrical insulation and strain-invariant EMI shielding behavior.展开更多
The thiol-imidazole functionalized(p-triphenyl-pentafluorobenzaldehyde)polymer(IMPTP)was prepared and quaternized with different side chains to obtain imidazolium-modified Me-IMPTP,He-IMPTP and BIM-IMPTP membranes for...The thiol-imidazole functionalized(p-triphenyl-pentafluorobenzaldehyde)polymer(IMPTP)was prepared and quaternized with different side chains to obtain imidazolium-modified Me-IMPTP,He-IMPTP and BIM-IMPTP membranes for application in high-temperature proton exchange membrane fuel cells(HT-PEMFCs).The presence of the thioether group in the polymers enabled radical scavenging for antioxidant properties,while imidazolium cations interacted strongly with H_(2)PO_(4) to prevent phosphoric acid(PA)leaching.The prepared BIM-IMPTP membrane incorporating bisimidazolium cation string with a long alkyl spacer demonstrated the highest mass retention of 82.93%after being immersed in Fenton's reagent for 24 h.Additionally,the PA-doped BIM-IMPTP membranes exhibited excellent PA retention under high-humidity conditions(80℃/100%RH).The single cell equipped with the BIM-IMPTP/320%PA membrane achieved a maximum power density(PDmax)of 945 mW cm^(-2)at 160℃.Among the four membranes with a similar acid doping content(ADC),the BIM-IMPTP/163%PA membrane with bis-cation pairs in the side chains exhibited a well-developed microphase-separated structure and high proton conductivity(119.0 mS cm^(-1)at 180℃).The single cell assembled with BIM-IMPTP/163%PA membrane maintained a PDmax of 613 mW cm^(-2)at 160℃ and demonstrated long-term operational stability under both 150/400 mA cm^(-2)and 80℃/200 mA cm^(-2)conditions.These results indicate that the introduction of thioether and bis-cation pairs in the structural design of polymers contributes significantly to the long-term stability of HT-PEMs.展开更多
High-temperature thin-film strain sensors are advanced technological devices for monitoring stress and strain in extreme environments,but the coupling of temperature and strain at high temperature is a challenge for t...High-temperature thin-film strain sensors are advanced technological devices for monitoring stress and strain in extreme environments,but the coupling of temperature and strain at high temperature is a challenge for their use.Here,this issue is addressed by creating a composite ink that combines Pb_(2)Ru_(2)O_(6) and TiB_(2) using polysilazane(PSZ)as a binder.After direct writing and annealing the PSZ/Pb_(2)Ru_(2)O_(6)/TiB_(2) film at 800℃ in air,the resulting thin film exhibits a low temperature coefficient of resistance(TCR)of only 281 ppm/℃ over a wide temperature range from 100℃ to 700℃,while also demonstrating high sensitivity with a gauge factor approaching 19.8.This exceptional performance is attributed to the intrinsic properties of Pb_(2)Ru_(2)O_(6),which has positive TCR at high temperature,and TiB2,which has negative TCR at high temperature.Combining these materials reduces the overall TCR of the film.Tests showed that the PSZ/Pb_(2)Ru_(2)O_(6)/TiB_(2) film maintains stable strain responses and significant signal output even under varying temperature.These findings provide valuable insights for developing high-temperature strain sensors with low TCR and high sensitivity,highlighting their potential for applications in high-temperature strain measurements.展开更多
This study investigated the physicochemical properties,enzyme activities,volatile flavor components,microbial communities,and sensory evaluation of high-temperature Daqu(HTD)during the maturation process,and a standar...This study investigated the physicochemical properties,enzyme activities,volatile flavor components,microbial communities,and sensory evaluation of high-temperature Daqu(HTD)during the maturation process,and a standard system was established for comprehensive quality evaluation of HTD.There were obvious changes in the physicochemical properties,enzyme activities,and volatile flavor components at different storage periods,which affected the sensory evaluation of HTD to a certain extent.The results of high-throughput sequencing revealed significant microbial diversity,and showed that the bacterial community changed significantly more than did the fungal community.During the storage process,the dominant bacterial genera were Kroppenstedtia and Thermoascus.The correlation between dominant microorganisms and quality indicators highlighted their role in HTD quality.Lactococcus,Candida,Pichia,Paecilomyces,and protease activity played a crucial role in the formation of isovaleraldehyde.Acidic protease activity had the greatest impact on the microbial community.Moisture promoted isobutyric acid generation.Furthermore,the comprehensive quality evaluation standard system was established by the entropy weight method combined with multi-factor fuzzy mathematics.Consequently,this study provides innovative insights for comprehensive quality evaluation of HTD during storage and establishes a groundwork for scientific and rational storage of HTD and quality control of sauce-flavor Baijiu.展开更多
Co-based alloy coating was prepared on Zr alloy using laser melting and cladding technique to study the difference in the high-temperature oxidation behavior between pure metal Co coatings and Co-T800 alloy coatings,a...Co-based alloy coating was prepared on Zr alloy using laser melting and cladding technique to study the difference in the high-temperature oxidation behavior between pure metal Co coatings and Co-T800 alloy coatings,as well as the wear resistance of the coatings.Besides,the effect of changing the laser melting process on the coatings was also investigated.The oxidation mass gain at 800–1200℃and the high-temperature oxidation behavior during high-temperature treatment for 1 h of two coated Zr alloy samples were studied.Results show that the Co coating and the Co-T800 coating have better resistance against high-temperature oxidation.After oxidizing at 1000℃for 1 h,the thickness of the oxide layer of the uncoated sample was 241.0μm,whereas that of the sample with Co-based coating is only 11.8–35.5μm.The friction wear test shows that the depth of the abrasion mark of the coated sample is only 1/2 of that of the substrate,indicating that the hardness and wear resistance of the Zr substrate are greatly improved.The disadvantage of Co-based coatings is the inferior corrosion resistance in 3.5wt%NaCl solution.展开更多
In order to understand the effect of Mo element on the high-temperature fatigue behavior of 15CrNbTi ferritic stainless steel, the stress-controlled fatigue tests have been performed for both 15CrNbTi and 15Cr0.5MoNbT...In order to understand the effect of Mo element on the high-temperature fatigue behavior of 15CrNbTi ferritic stainless steel, the stress-controlled fatigue tests have been performed for both 15CrNbTi and 15Cr0.5MoNbTi ferritic stainless steels at 800 ℃ in laboratory air. The fatigue test results indicate that the fatigue resistance of 15Cr0.5MoNbTi steel is manifestly higher than that of 15CrNbTi steel at the maximum stress below 57 MPa; the 15Cr0.5MoNbTi steel possesses a fatigue limit of 35 MPa, which is higher than that of 15CrNbTi steel. The TEM observations reveal that the Mo element can suppress the formation of coarsened Fe3Nb3C precipitates and result in the fatigue resistance enhancement. The dislocation networks formed during the cyclic load favor to improve the fatigue resistance of 15Cr0.5MoNbTi steel at 800 ℃.展开更多
Effects of 405 stainless steel(405 SS) on crevice corrosion behavior of Alloy 690 in high-temperature pure water were investigated.Results revealed that the corrosion rate of Alloy 690 was low within the crevice.It wa...Effects of 405 stainless steel(405 SS) on crevice corrosion behavior of Alloy 690 in high-temperature pure water were investigated.Results revealed that the corrosion rate of Alloy 690 was low within the crevice.It was likely attributed to the fact that a Cr-rich inner oxide film and a Ni-rich layer beneath this oxide film formed upon Alloy 690,inhibiting the diffu sion of oxygen towards the oxide/matrix interface.Moreover,the Fe2+ions dissolved from 405 SS consumed most of oxygen,leading to less oxygen participating in the oxidation of Alloy 690.In addition,it was found that Fe concentration continuously decreased from the surface of the inner oxide film to the oxide/matrix interface of Alloy 690 within the crevice,which was probably due to the diffusion of Fe2+ions dissolved from 405 SS into the inner oxide film.展开更多
The kinetic curve of the high-temperature oxidation of austenitie stainless steel Crl8Ni11 Cu3Al3MnNb at different temperatures was measured by weighting method. It is showed that the oxidation curves at 700 and 800 ...The kinetic curve of the high-temperature oxidation of austenitie stainless steel Crl8Ni11 Cu3Al3MnNb at different temperatures was measured by weighting method. It is showed that the oxidation curves at 700 and 800 ℃ followed the parabolic law, and the steel presented an excellent anti-oxidation. The surface morphology and structure of the oxide film were studied by scanning electron microscopy and X-ray diffraction methods. A dense oxide film was attained at 700 and 800 ℃, mainly composed of the hexagonal Al2 O3, Fe2 O3, and a small amount oxide of Cr at 700 ℃. At 900 ℃ the oxide film started to delaminate, and was composed of （Cr,Fe）2O3 and the spinel CuCrMnO4 and Fe（Cr, Al） 2O3.展开更多
High-nickel ternary cathodes hold a great application prospect in solid-state lithium metal batteries to achieve high-energy density,but they still suffer from structural instability and detrimental side reactions wit...High-nickel ternary cathodes hold a great application prospect in solid-state lithium metal batteries to achieve high-energy density,but they still suffer from structural instability and detrimental side reactions with the solid-state electrolytes.To circumvent these issues,a continuous uniform layer polyacrylonitrile(PAN)was introduced on the surface of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2) via in situ polymerization of acrylonitrile(AN).Furthermore,the partial-cyclized treatment of PAN(cPAN)coating layer presents high ionic and electron conductivity,which can accelerate interfacial Li+and electron diffusion simultaneously.And the thermodynamically stabilized cPAN coating layer cannot only effectively inhibit detrimental side reactions between cathode and solid-state electrolytes but also provide a homogeneous stress to simultaneously address the problems of bulk structural degradation,which contributes to the exceptional mechanical and electrochemical stabilities of the modified electrode.Besides,the coordination bond interaction between the cPAN and NCM811 can suppress the migration of Ni to elevate the stability of the crystal structure.Benefited from these,the In-cPAN-260@NCM811 shows excellent cycling performance with a retention of 86.8%after 300 cycles and superior rate capability.And endow the solid-state battery with thermal safety stability even at hightemperature extreme environment.This facile and scalable surface engineering represents significant progress in developing high-performance solid-state lithium metal batteries.展开更多
High-temperature industries,as the primary consumers of energy,are greatly concerned with energy savings.Designing refractory linings with low thermal conductivity to reduce heat dissipation through high-temperature f...High-temperature industries,as the primary consumers of energy,are greatly concerned with energy savings.Designing refractory linings with low thermal conductivity to reduce heat dissipation through high-temperature furnace linings is a critical concern.In this study,a series of novel entropy-stabilized spinel materials are reported,and their potential applications in high-temperature industries are investigated.XRD and TEM results indicate that all materials possess a cubic spinel crystal structure with the■space group.Furthermore,these materials exhibit good phase stability at high temperatures.All entropy-stabilized spinel aggregates demonstrated high refractoriness(>1800℃)and a high load softening temperature(>1700℃).The impact of configurational entropy on the properties of entropy-stabilized spinel materials was also studied.As configurational entropy increased,the thermal conductivity of the entropy-stabilized spinel decreased,while slag corrosion resistance deteriorated.For the entropy-stabilized spinel with a configurational entropy value of 1.126R,it showed good high-temperature stability,reliable resistance to slag attack,and a low thermal conductivity of 2.776 W·m^(-1)·K^(-1)at 1000℃.展开更多
基金National Natural Science Foundation of China(52071274)Key Research and Development Projects of Shaanxi Province(2023-YBGY-442)Science and Technology Nova Project-Innovative Talent Promotion Program of Shaanxi Province(2020KJXX-062)。
文摘To mitigate the impact of interdiffusion reactions between the silicide slurry and Ta12W alloy substrate during vacuum sintering process on the oxidation resistance of the silicide coating,a micro-arc oxidation pretreatment was employed to construct a Ta_(2)O_(5)ceramic layer on the Ta12W alloy surface.Subsequently,a slurry spraying-vacuum sintering method was used to prepare a Si-Cr-Ti-Zr coating on the pretreated substrate.Comparative studies were conducted on the microstructure,phase composition,and isothermal oxidation resistance(at 1600℃)of the as-prepared coatings with and without the micro-arc oxidation ceramic layer.The results show that the Ta_(2)O_(5)layer prepared at 400 V is more continuous and has smaller pores than that prepared at 350 V.After microarc oxidation pretreatment,the Si-Cr-Ti-Zr coating on Ta12W alloy consists of three distinct layers:an upper layer dominated by Ti_(5)Si_(3),Ta_(5)Si_(3),and ZrSi;a middle layer dominated by TaSi_(2);a coating/substrate interfacial reaction layer dominated by Ta_(5)Si_(3).Both the Si-Cr-Ti-Zr coatings with and without the Ta_(2)O_(5)ceramic layer do not fail after isothermal oxidation at 1600℃for 5 h.Notably,the addition of the Ta2O5 ceramic layer reduces the high-temperature oxidation rate of the coating.
基金provided by the National Natural Science Foundation of China(NSFC)through the Joint Fund Project(No.U24A202815)the Youth Science Fund Project(No.52302031).
文摘A calcium zirconate crucible material with excellent performance was prepared by fixing the particle size proportion and exploring the addition of Y_(2)O_(3).The results show that Y^(3+)solid-dissolves into c-ZrO_(2)to occupy the Zr^(4+)positions,leading to structural defects and promoting the sintering of calcium zirconate.Adding 0.5 wt.%Y_(2)O_(3)into calcium zirconate can enhance the modulus of rupture,reduce the thermal expansion coefficient,and improve the thermal shock resistance.Through high-temperature test,it is found that adding 0.5 wt.%Y_(2)O_(3)significantly improves the corrosion resistance of the sample.
基金supported by the Key R&D Program of Shandong Province,China(No.2025CXGC 010412)the National Key Research and Development Program of China(No.2022YFB3709300)the National Natural Science Foundation of China(No.U21A2048).
文摘The limited high-temperature oxidation resistance of Mg alloys is a key factor restricting their development and application.The addition of some rare earth elements(REs),owing to their unique physical and chemical properties,can significantly enhance the oxidation resistance of Mg alloys.Based on our previous study,we conclude that REs such as Gd,Y,and Ce enhance the oxidation resistance of Mg-RE alloys.This article comprehensively reviews recent research progress on high-temperature oxidation behavior and the potential mechanism in Mg-RE alloys.Based on the thermodynamic and kinetic analyses,the evolution of the complex oxide system formed during the high-temperature oxidation of Mg-RE alloys is first summarized.The diffusion behavior and concentration control mechanisms of REs during the oxidation process and how these mechanisms affect the sustained growth of the oxide film and antioxidant properties were elucidated.Moreover,the different structures of the oxide films were classified,and their properties were discussed.Finally,this paper introduces the applications of commonly used REs in Mg alloys and frontier research on their oxidation mechanisms.Based on the above review,we propose that future research perspectives can be explored in terms of expanding the experimental temperature range for oxidation tests,optimizing the chemical composition by adding trace REs to study their synergistic mechanism,revealing the underlying oxidation mechanism through advanced in situ microscopic characterization methods,and investigating the mechanical properties of oxide films using diverse approaches.
基金supported by the Original Exploratory Program of the National Natural Science Foundation of China(No.52450012)。
文摘TiB_(2)coatings can significantly enhance the high-temperature oxidation resistance of molybdenum,which would broaden the application range of molybdenum and alloys thereof.However,traditional methods for preparing TiB_(2)coatings have disadvantages such as high equipment costs,complicated processes,and highly toxic gas emissions.This paper proposes an environmentally friendly method,which requires inexpensive equipment and simple processing,for preparing TiB_(2)coating on molybdenum via electrophoretic deposition within Na3AlF6-based molten salts.The produced TiB_(2)layer had an approximate thickness of 60μm and exhibited high density,outstanding hardness(38.2 GPa)and robust adhesion strength(51 N).Additionally,high-temperature oxidation experiments revealed that,at900℃,the TiB_(2)coating provided effective protection to the molybdenum substrate against oxidation for 3 h.This result indicates that the TiB_(2)coating prepared on molybdenum using molten salt electrophoretic deposition possesses good high-temperature oxidation resistance.
基金National Natural Science Foundation of China(No.U2241205)the Natural Science Basic Research Program of Shaanxi(Nos.2022JC-33,2023-GHZD-35,and 2024JC-ZDXM-25)+1 种基金the Fundamental Research Funds for the Central Universitiesthe National 111 Project to provide fund for conducting experiments。
文摘In this study,the design,analysis,manufacturing,and testing of a 3D-printed conformal microstrip array antenna for high-temperature environments is presented.3D printing technology is used to fabricate a curved ceramic substrate,and laser sintering and microdroplet spraying processes are used to add the conductive metal on the curved substrate.The problems of gain loss,bandwidth reduction,and frequency shift caused by high temperatures are addressed by using a proper antenna design,with parasitic patches,slots,and metal resonant cavities.The antenna prototype is characterized by the curved substrates and the conductive metals for the power dividers,the patch,and the ground plane;its performance is examined up to a temperature of 600℃in a muffle furnace and compared with the results from the numerical analysis.The results show that the antenna can effectively function at 600℃and even higher temperatures.
基金financially supported by the National Natural Science Foundation of China(Nos.52271089 and 52001023)the Basic Research and Application Basic Research Foundation of Guangdong Province(Nos.2022A1515240016 and 2023B1515250006)the Fundamental Research Funds for the Central Universities(No.FRF-BD-23-01).
文摘The austenite(γ)reversely transformed from lath martensite(LM),lath bainite(LB),granular bainite(GB)and pearlite+ferrite(P+F)in a high-strength steel was studied at high temperatures using in-situ electron backscatter diffraction(EBSD).The memory effect of initial γ significantly affects the nucleation of the reverted γ in LM and GB structures,while a weak influence on that of LB and P+F structures.This results in a significant difference in γ grain size after complete austenitization,with the first two obtaining larger γ grains while the latter two are relatively small.Crystallographic analysis revealed that the reverted γ with acicular morphology(γA),most of which maintained the same orientation with the prior γ,dominated the reaustenitization behavior of LM and GB structures through preferential nucleation within γ grains and coalesced growth modes.Although globular reverted γ(γ_(G))with random orientation or large deviation from the prior γ can nucleate at the grain boundaries or within the grains,it is difficult for it to grow and play a role in segmenting and refining the prior γ due to the inhibition of γ_(A) coalescing.For LB and P+F structures,the nucleation rate of intragranular γ_(G) increases with increasing temperature,and always shows a random orientation.These γ_(G) grains can coarsen simultaneously with the intergranular γ_(G),ultimately playing a role in jointly dividing and refining the finalγgrains.Research also found that the differences in the effects of four different microstructures on revertedγnucleation are closely related to the variant selection of the matrix structure,as well as the content and size of cementite(θ).High density of block boundaries induced by weakening of variant selection and many fineθformed in the lath are the key to promoting LB structure to obtain more intragranular γ_(G) formation,as well as the important role of the large-sized θ in P+F structure.
基金Project(U24B20125)supported by the National Natural Science Foundation of ChinaProject(K2024T005)supported by the China National Railway Group Science and Technology Program。
文摘The suspension gap is a critical operational parameter for high-speed maglev trains and significantly impacts their aerodynamic performance.Based on an engineering prototype of the high-temperature superconducting(HTS)pinning maglev train,this study established a detailed three-dimensional model,and then the aerodynamic characteristics of the HTS maglev train at 600 km/h with suspension gaps of 10 mm,20 mm,and 30 mm were simulated based on the improved delayed detached eddy simulation(IDDES)turbulence model and SST kωtwo-equation.The results demonstrated that the underbody design of the HTS maglev train leads to unique aerodynamic drag and aerothermal distribution phenomena.The head car experiences the smallest drag,while the tail car experiences the largest.The aerothermal temperature on the train's bottom surface progressively increases from the head to the tail.Additionally,the U-shaped track significantly constrains the flow around the train body,forming strong vortex structures.As the suspension gap increases from 10 mm to 30 mm,the airflow velocity in the train-track gap rises,reducing the underbody pressure and decreasing the lift of the head car by 12.43%.The drag of the head car increases by 10.98%,primarily due to changes in pressure drag.Additionally,the temperature at the underbody of the tail car rises further due to significant airflow deceleration.These findings provide valuable insights for advancing the engineering design and application of the high-speed HTS maglev technology.
基金Supported by National Natural Science Foundation of China(Grant Nos.52075048,51675058,12232004)Hunan Provincial Excellent Youth Project of the Education Department(Grant No.21B0304)+2 种基金Natural Science Foundation of Hunan Province(Grant No.2023JJ30025)Science and Technology Innovation Program of Hunan Province(Grant No.2023RC1058)Scientific Research Innovation Project for Graduate Student of Changsha University of Science and Technology(Grant No.CLSJCX22096)。
文摘The high-temperature oxidation resistance of AISI 321 stainless steel used in solar thermal power heat exchangers determines its service life.In this study,aluminizing and subsequent laser shock peening(LSP)treatments were employed to improve the high-temperature oxidation resistance of AISI 321 stainless steel at 620°C.These two treatments decreased the oxidation rate of AISI 321 steel.Specifically,the optimal oxidation resistance was observed in aluminized steel before oxidation for 144 h owing to the increased entropy of the LSP-treated specimen.After 144 h,LSP-treated steel achieved the best oxidation resistance because of the formation of a protectiveα-Al2O3film.Moreover,the large amount of subgrain boundaries formed on the aluminized layer of the LSP-treated samples could act as short-circuit paths for the outward diffusion of Al,facilitating the rapid nucleation ofα-Al2O3.Meanwhile,the aluminized layer could isolate the contact between the oxidation environment and matrix,thereby decreasing the oxidation rate.Furthermore,the minimum oxidation parabolic constant was calculated for LSP-treated steel(6.45787×10^(-14)),which was 69.18%and 36.36%that of aluminized and 321 steel,respectively,during the entire oxidation process.Therefore,the combination of aluminizing and LSP treatments can improve the high-temperature oxidation resistance of 321 stainless steel,providing a new idea for its surface treatment to achieve a long service life at high temperatures.
基金support of the National Ceramic Industry Design Institute of China(No.NI-CID2022Z02)the Instrumental Analysis Center of Xidian University for providing test equipment,the Shaanxi Key Laboratory of High-Orbits-Electron Materials and Protection Technology for Aerospace,the Aeronautical Science Foundation of China(No.2022Z033081001)+1 种基金the Xidian University Specially Funded Project for Interdisciplinary Exploration(No.TZJH2024055)the financial supports of the Key Research and Development Program of Shaanxi(No.2022GY-184).
文摘Maintaining high piezoelectric response and piezoelectric temperature stability of lead-based piezoceramics is critical for applications under high-temperature environments.Unfortunately,the piezoelectric response of lead-based piezoceramics shows strong temperature dependence.Herein,an innovative strategy was proposed to solve this problem.The method consisted of constructing“slush-like”polar states by introducing localized heterostructures in the tetragonal phase structure to lower the energy barriers.The presence of the tetragonal phase stabilized the domain structure,providing excellent temperature stability,while the localized heterostructures also flattened the free energy landscape and enhanced the piezo-electric response.The strategy was implemented by using 0.11Pb(In_(0.5)Nb_(0.5))O_(3)-0.89Pb(Hf_(0.47)Ti_(0.53))O_(3)(PIN-PHT)piezoceramics doped with heterovalent ion Nb^(5+)to form a“slush-like”polar state with strong in-teractions inside the ceramics.The piezoelectric response and relaxor behavior of the ceramics were then investigated using piezoelectric force microscopy to reveal the mapping relationship between the complex ferroelectric domain structure and both the piezoelectric response and temperature stability.At Nb5+doping amount of 0.8 mol%,the ceramics showed excellent comprehensive performances with d_(33)=764 pC/N,T_(c)=319.1℃,ε_(r)=3253.59,k_(p)=0.67,and tan δ=0.0122.At an external ambient temperature of 300℃,the d_(33) of PIN-PHT-0.8Nb^(5+) remained high at 734 pC/N,with piezoelectric performance retention of 96.1%,showing excellent temperature stability.Overall,a new path was proposed for developing Pb-based piezoceramics with both good piezoelectric response and high-temperature stability,promising to broaden the temperature range of high-temperature piezoceramics for various applications.
基金Financial support was provided by the National Natural Science Foundation of China(22325804,22578197)National Key Research and Development Project of China(2021YFB3801302,2022YFC3900300)+1 种基金Jiangsu Future Membrane Technology Innovation Center(No.BM2021804)Natural Science Foundation of Jiangsu Higher Education Institutions of China(No.25KJA530003).
文摘During the production processes of energy,metallurgy,chemical engineering,and other process industries,substantial high-temperature dustladen flue gas is generated.Asymmetric silicon carbide(SiC)membranes exhibit significant potential in flue gas filtration since they enable direct filtration of high-temperature gas and facilitate thermal energy recovery.However,membrane particle penetration is a prevalent issue when constructing membrane layer directly on macroporous support,which contributes to a considerable mass transfer resistance.Herein,a novel hydrophobic modification strategy was developed to avoid the slurry penetration,thereby fabricating the asymmetric SiC membrane without the necessity of any intermediate or sacrificial layer.Firstly,the modifier concentration was adjusted to guarantee that the support was hydrophobic enough to prevent the slurry from penetrating.Subsequently,the slurry surface tension was fine-tuned by introducing ethanol to enhance the integrity of the SiC membrane.Furthermore,the effect of solid content was systematically investigated.It was demonstrated that the optimized SiC membranes obtained excellent gas permeance from 100.8 to 199.8 m^(3)·m^(-2)·h^(-1)·kPa^(-1)with the pore size ranging from 1.93 to 3.89μm.Also,the SiC membrane exhibited excellent stability for 24 h and achieved an excellent dust removal efficiency(99.99%)when filtering ultrafine dust particles(~300 nm)under high temperatures.This method effectively bridges the membrane particle penetration issue caused by the particle size disparity among different layers of the asymmetric membrane,establishing an efficient strategy to fabricate highpermeance SiC membranes applied in high-temperature dust-laden gas filtration.
基金the financial support from the Director’s Fund of the Hefei Institute of Materials Research,Chinese Academy of Sciences(Nos.YZJJQY202405 and YZJJ2024QN36).
文摘While the enhancement of elastomer properties through nanofiller addition has been widely explored,developing high-performance elastomers for electrically insulating electromagnetic interference(EMI)shielding materials using a simple approach remains crucial.In this study,high-performance composite silicone rubber(SR)elastomers were fabricated through a combination of straightforward physical mixing and chemical grafting approach.Specifically,the incorporation of components aluminum trioxide nanoparticles(n-Al_(2)O_(3))and reactive small molecule 2-isocyanoethyl acrylate(ICA)and 2-Amino-4-hydroxy-6-methylpyrimidine(UPY)into SR significantly improved both the mechanical strength and ther-mal resistance of the composites due to the synergistic effects of nanoparticles and hydrogen bonding.In addition,as flexible electronics become more complex and miniaturised,there is an increasing demand for stretchable electrically insulating EMI shielding materials.Liquid metal(LM)with extreme fluidity is ideal for the preparation of stretchable EMI shielding materials.By introducing LM,we prepared a stretchable electrically insulating EMI shielding material with a sandwich structure using a simple mechanical sintering and lamination process,and the EMI shielding properties of the material remained stable before and after stretching.The modified insulating layer has excellent elasticity and thermal stability,which en-sures the normal use of the composite EMI shielding material under high temperatures and mechanical deformation conditions.This research provides valuable insights into the development of shielding materials with high-performance electrical insulation and strain-invariant EMI shielding behavior.
基金supported by the National Natural Science Foundation of China(No.22179047)the Development of Scientific and Technological Project of Jilin Province(20230201139GX).
文摘The thiol-imidazole functionalized(p-triphenyl-pentafluorobenzaldehyde)polymer(IMPTP)was prepared and quaternized with different side chains to obtain imidazolium-modified Me-IMPTP,He-IMPTP and BIM-IMPTP membranes for application in high-temperature proton exchange membrane fuel cells(HT-PEMFCs).The presence of the thioether group in the polymers enabled radical scavenging for antioxidant properties,while imidazolium cations interacted strongly with H_(2)PO_(4) to prevent phosphoric acid(PA)leaching.The prepared BIM-IMPTP membrane incorporating bisimidazolium cation string with a long alkyl spacer demonstrated the highest mass retention of 82.93%after being immersed in Fenton's reagent for 24 h.Additionally,the PA-doped BIM-IMPTP membranes exhibited excellent PA retention under high-humidity conditions(80℃/100%RH).The single cell equipped with the BIM-IMPTP/320%PA membrane achieved a maximum power density(PDmax)of 945 mW cm^(-2)at 160℃.Among the four membranes with a similar acid doping content(ADC),the BIM-IMPTP/163%PA membrane with bis-cation pairs in the side chains exhibited a well-developed microphase-separated structure and high proton conductivity(119.0 mS cm^(-1)at 180℃).The single cell assembled with BIM-IMPTP/163%PA membrane maintained a PDmax of 613 mW cm^(-2)at 160℃ and demonstrated long-term operational stability under both 150/400 mA cm^(-2)and 80℃/200 mA cm^(-2)conditions.These results indicate that the introduction of thioether and bis-cation pairs in the structural design of polymers contributes significantly to the long-term stability of HT-PEMs.
基金the National Key Research and Development Program of China(Grant No.2021YFB2012100)the Major Science and Technology Projects in Fujian Province(Grant No.2023HZ021005)+1 种基金the Open Project Program of Fujian Key Laboratory of Special Intelligent Equipment Measurement and Control(Grant No.FJIES2023KF06)the Industry-University-Research Co-operation Fund of the Eighth Research Institute of China Aerospace Science and Technology Corporation(Grant No.SAST2023-061).
文摘High-temperature thin-film strain sensors are advanced technological devices for monitoring stress and strain in extreme environments,but the coupling of temperature and strain at high temperature is a challenge for their use.Here,this issue is addressed by creating a composite ink that combines Pb_(2)Ru_(2)O_(6) and TiB_(2) using polysilazane(PSZ)as a binder.After direct writing and annealing the PSZ/Pb_(2)Ru_(2)O_(6)/TiB_(2) film at 800℃ in air,the resulting thin film exhibits a low temperature coefficient of resistance(TCR)of only 281 ppm/℃ over a wide temperature range from 100℃ to 700℃,while also demonstrating high sensitivity with a gauge factor approaching 19.8.This exceptional performance is attributed to the intrinsic properties of Pb_(2)Ru_(2)O_(6),which has positive TCR at high temperature,and TiB2,which has negative TCR at high temperature.Combining these materials reduces the overall TCR of the film.Tests showed that the PSZ/Pb_(2)Ru_(2)O_(6)/TiB_(2) film maintains stable strain responses and significant signal output even under varying temperature.These findings provide valuable insights for developing high-temperature strain sensors with low TCR and high sensitivity,highlighting their potential for applications in high-temperature strain measurements.
文摘This study investigated the physicochemical properties,enzyme activities,volatile flavor components,microbial communities,and sensory evaluation of high-temperature Daqu(HTD)during the maturation process,and a standard system was established for comprehensive quality evaluation of HTD.There were obvious changes in the physicochemical properties,enzyme activities,and volatile flavor components at different storage periods,which affected the sensory evaluation of HTD to a certain extent.The results of high-throughput sequencing revealed significant microbial diversity,and showed that the bacterial community changed significantly more than did the fungal community.During the storage process,the dominant bacterial genera were Kroppenstedtia and Thermoascus.The correlation between dominant microorganisms and quality indicators highlighted their role in HTD quality.Lactococcus,Candida,Pichia,Paecilomyces,and protease activity played a crucial role in the formation of isovaleraldehyde.Acidic protease activity had the greatest impact on the microbial community.Moisture promoted isobutyric acid generation.Furthermore,the comprehensive quality evaluation standard system was established by the entropy weight method combined with multi-factor fuzzy mathematics.Consequently,this study provides innovative insights for comprehensive quality evaluation of HTD during storage and establishes a groundwork for scientific and rational storage of HTD and quality control of sauce-flavor Baijiu.
基金National Natural Science Foundation of China(52071126)Natural Science Foundation of Tianjin City,China(22JCQNJC01240)+2 种基金Central Guidance on Local Science and Technology Development Fund of Hebei Province(226Z1009G)Special Funds for Science and Technology Innovation in Hebei(2022X19)Anhui Provincial Natural Science Foundation(2308085ME135)。
文摘Co-based alloy coating was prepared on Zr alloy using laser melting and cladding technique to study the difference in the high-temperature oxidation behavior between pure metal Co coatings and Co-T800 alloy coatings,as well as the wear resistance of the coatings.Besides,the effect of changing the laser melting process on the coatings was also investigated.The oxidation mass gain at 800–1200℃and the high-temperature oxidation behavior during high-temperature treatment for 1 h of two coated Zr alloy samples were studied.Results show that the Co coating and the Co-T800 coating have better resistance against high-temperature oxidation.After oxidizing at 1000℃for 1 h,the thickness of the oxide layer of the uncoated sample was 241.0μm,whereas that of the sample with Co-based coating is only 11.8–35.5μm.The friction wear test shows that the depth of the abrasion mark of the coated sample is only 1/2 of that of the substrate,indicating that the hardness and wear resistance of the Zr substrate are greatly improved.The disadvantage of Co-based coatings is the inferior corrosion resistance in 3.5wt%NaCl solution.
基金supported by the National Natural Science Foundation of China (No. 51134010)
文摘In order to understand the effect of Mo element on the high-temperature fatigue behavior of 15CrNbTi ferritic stainless steel, the stress-controlled fatigue tests have been performed for both 15CrNbTi and 15Cr0.5MoNbTi ferritic stainless steels at 800 ℃ in laboratory air. The fatigue test results indicate that the fatigue resistance of 15Cr0.5MoNbTi steel is manifestly higher than that of 15CrNbTi steel at the maximum stress below 57 MPa; the 15Cr0.5MoNbTi steel possesses a fatigue limit of 35 MPa, which is higher than that of 15CrNbTi steel. The TEM observations reveal that the Mo element can suppress the formation of coarsened Fe3Nb3C precipitates and result in the fatigue resistance enhancement. The dislocation networks formed during the cyclic load favor to improve the fatigue resistance of 15Cr0.5MoNbTi steel at 800 ℃.
基金supported by the National Natural Science Foundation of China No.51671201the National Scienceand Technology Major Project No.2017ZX06002003-004-002+1 种基金the Key Programs of the Chinese Academy of Sciences Research on the Development of Nuclear Power Materials and Service Security Technology,No.ZDRW-CN-2017-1the Innovation Fund of Institute of Metal Research,Chinese Academy of Sciences No.SCJJ-2013-ZD-02。
文摘Effects of 405 stainless steel(405 SS) on crevice corrosion behavior of Alloy 690 in high-temperature pure water were investigated.Results revealed that the corrosion rate of Alloy 690 was low within the crevice.It was likely attributed to the fact that a Cr-rich inner oxide film and a Ni-rich layer beneath this oxide film formed upon Alloy 690,inhibiting the diffu sion of oxygen towards the oxide/matrix interface.Moreover,the Fe2+ions dissolved from 405 SS consumed most of oxygen,leading to less oxygen participating in the oxidation of Alloy 690.In addition,it was found that Fe concentration continuously decreased from the surface of the inner oxide film to the oxide/matrix interface of Alloy 690 within the crevice,which was probably due to the diffusion of Fe2+ions dissolved from 405 SS into the inner oxide film.
基金Item Sponsored by Special Fund of Jiangsu Province of China for Transformation of Scientific and Technological Achievements (BA2010053)
文摘The kinetic curve of the high-temperature oxidation of austenitie stainless steel Crl8Ni11 Cu3Al3MnNb at different temperatures was measured by weighting method. It is showed that the oxidation curves at 700 and 800 ℃ followed the parabolic law, and the steel presented an excellent anti-oxidation. The surface morphology and structure of the oxide film were studied by scanning electron microscopy and X-ray diffraction methods. A dense oxide film was attained at 700 and 800 ℃, mainly composed of the hexagonal Al2 O3, Fe2 O3, and a small amount oxide of Cr at 700 ℃. At 900 ℃ the oxide film started to delaminate, and was composed of （Cr,Fe）2O3 and the spinel CuCrMnO4 and Fe（Cr, Al） 2O3.
基金financially supported by the National Natural Science Foundation of China(Nos.22102212 and 22479067).
文摘High-nickel ternary cathodes hold a great application prospect in solid-state lithium metal batteries to achieve high-energy density,but they still suffer from structural instability and detrimental side reactions with the solid-state electrolytes.To circumvent these issues,a continuous uniform layer polyacrylonitrile(PAN)was introduced on the surface of LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2) via in situ polymerization of acrylonitrile(AN).Furthermore,the partial-cyclized treatment of PAN(cPAN)coating layer presents high ionic and electron conductivity,which can accelerate interfacial Li+and electron diffusion simultaneously.And the thermodynamically stabilized cPAN coating layer cannot only effectively inhibit detrimental side reactions between cathode and solid-state electrolytes but also provide a homogeneous stress to simultaneously address the problems of bulk structural degradation,which contributes to the exceptional mechanical and electrochemical stabilities of the modified electrode.Besides,the coordination bond interaction between the cPAN and NCM811 can suppress the migration of Ni to elevate the stability of the crystal structure.Benefited from these,the In-cPAN-260@NCM811 shows excellent cycling performance with a retention of 86.8%after 300 cycles and superior rate capability.And endow the solid-state battery with thermal safety stability even at hightemperature extreme environment.This facile and scalable surface engineering represents significant progress in developing high-performance solid-state lithium metal batteries.
基金financially supported by the National Natural Science Foundation of China(Nos.52472032 and 52172023)the Key Program of Natural Science Foundation of Hubei Province(No.2024AFA083)
文摘High-temperature industries,as the primary consumers of energy,are greatly concerned with energy savings.Designing refractory linings with low thermal conductivity to reduce heat dissipation through high-temperature furnace linings is a critical concern.In this study,a series of novel entropy-stabilized spinel materials are reported,and their potential applications in high-temperature industries are investigated.XRD and TEM results indicate that all materials possess a cubic spinel crystal structure with the■space group.Furthermore,these materials exhibit good phase stability at high temperatures.All entropy-stabilized spinel aggregates demonstrated high refractoriness(>1800℃)and a high load softening temperature(>1700℃).The impact of configurational entropy on the properties of entropy-stabilized spinel materials was also studied.As configurational entropy increased,the thermal conductivity of the entropy-stabilized spinel decreased,while slag corrosion resistance deteriorated.For the entropy-stabilized spinel with a configurational entropy value of 1.126R,it showed good high-temperature stability,reliable resistance to slag attack,and a low thermal conductivity of 2.776 W·m^(-1)·K^(-1)at 1000℃.
