Dielectric metamaterials based on ceramics have attracted considerable in-terest in the past few years owing to their low dielectric loss,simple structure,excellent multifield tunability,and good environmental adaptab...Dielectric metamaterials based on ceramics have attracted considerable in-terest in the past few years owing to their low dielectric loss,simple structure,excellent multifield tunability,and good environmental adaptability.They are considered to be promising alternative to metal-based metamaterials and can lead to a new strategy for the development of passive devices.In this review,the recent progress of ceramic-based dielectric metamaterials in electro-magnetic applications,energy applications,non-Hermitian systems,and natural materials with near-zero or negative refraction are summarized.The design principle and mechanism,as well as manufacturing technologies,are also introduced,and the current development trend of ceramic-based dielectric metamaterials are proposed.展开更多
Compared with other secondary batteries,lithium-sulfur batteries(LSBs)have unparalleled advantages such as high energy density,low cost,etc.In liquid LSB systems,it is extremely easy to cause severe‘‘shuttle effecto...Compared with other secondary batteries,lithium-sulfur batteries(LSBs)have unparalleled advantages such as high energy density,low cost,etc.In liquid LSB systems,it is extremely easy to cause severe‘‘shuttle effecto and safety issues.Hence,the development of solid-state LSBs(SSLSBs)has been attracting much more attention.As the most essential part of the SSLSBs,the solid-state electrolyte(SSE)has received significant attention from researchers.In this review,we concentrate on discussing the core of SSLSBs,which is the SSE.Moreover,we also highlight the differences in the properties of the different SSEs,which are polymer-based electrolytes and ceramic-based electrolytes.In addition,the challenges and advances in different types of SSEs are also compared and described systematically.Furthermore,the prospects for new SSE systems and the design of effective SSE structures to achieve highperformance SSLSBs are also discussed.Thus,this review is expected to give readers a comprehensive and systematic understanding of SSEs for SSLSBs.展开更多
By means of different checks and measures, we obserced and analysed the microstructure of Fe-Al/ Al2O3 composite material, We found that not only intragranular nanostructure grains and rod-like crystals but also fine-...By means of different checks and measures, we obserced and analysed the microstructure of Fe-Al/ Al2O3 composite material, We found that not only intragranular nanostructure grains and rod-like crystals but also fine-grained structure of the composite material as well as the bridging of the Fe-Al intermetallics compound contribute to the material＇s strength and toughness, It is shoun that the strengthening and toughening of the Fe- Al/ Al2O3 composite is the joint effect of a multiplicute strengthening and tougheniug mechanism.展开更多
In the upcoming 6-generation(6G)revolution,the achievement of low power consumption has become a key objective in research concerning terahertz devices.As an important component of passive devices,there are very few l...In the upcoming 6-generation(6G)revolution,the achievement of low power consumption has become a key objective in research concerning terahertz devices.As an important component of passive devices,there are very few low-loss dielectric ceramics in the terahertz range.To elucidate the mechanism of loss and promote the application of microwave dielectric ceramics for future 6G technology(covering microwave and terahertz frequencies),the terahertz responses of ANb_(2)O_(6)(A=Zn,Co,Mn,and Ni)columbite niobates were studied.The influences of magnetic loss on the Qxf values in the microwave range with different transition metal ions in the A-site were reasonably analyzed.Moreover,due to the weakened magnetic relaxation properties in the terahertz range,the samples all exhibited low loss and approximate transparency,especially for MnNb_(2)O_(6) and NiNb_(2)O_(6)(tano<0.01 and absorption coefficient<10 cm^(-1) below 1.2 THz),which subverted the definition of traditional low-loss microwave dielectric ceramics.Ultimately,based on Mie theory,we designed a prototypical broadband metamaterial reflector to validate the applicability of the ANb_(2)O_(6) system in the terahertz band,which is highly important for the development of terahertz ceramic-based passive devices.展开更多
This work used high velocity oxygen fuel spraying technology to prepare three types of ceramic-based self-lubricating sealing coating on C/SiC substrates,with Yttria-stabilized zirconia as the matrix and different mas...This work used high velocity oxygen fuel spraying technology to prepare three types of ceramic-based self-lubricating sealing coating on C/SiC substrates,with Yttria-stabilized zirconia as the matrix and different mass fractions of Mo and Ag as lubricating phases.The compositions are S1(50%YSZ40%CaF_(2)10%Mo),S2(50%YSZ40%CaF_(2)10%Ag)and S3(40%YSZ30%CaF_(2)10%Mo10%Ag10%SiO_(2)).The friction coefficient and wear rate of the coating were examined at room temperature(RT),400℃and 800℃.The effects of different lubricating phases on the tribological properties of the coating were compared.The wear mechanism of the coating under different temperature environments will be revealed by clarifying the evolution law of the microstructure of the coating.The results show that the addition of Ag can improve the lubricating ability of the coating.Ag element forms a continuous and smooth tribo-layer on the sliding surface to reduce the friction coefficient of the coating.In addition,the lubricating effect of Ag element is more significant at medium and low temperatures.At 800℃,the S3 coating with both Ag and Mo exhibited excellent tribological properties.The wear mechanism of the coating is that it starts with adhesive wear and gradually transitions to abrasive wear as friction continues.This work provides theoretical support and experimental evidence for the construction of ceramic-based self-lubricating sealing coating with a wide temperature range.展开更多
基金Basic Science Center Project of NSFC,Grant/Award Number:No.51788104
文摘Dielectric metamaterials based on ceramics have attracted considerable in-terest in the past few years owing to their low dielectric loss,simple structure,excellent multifield tunability,and good environmental adaptability.They are considered to be promising alternative to metal-based metamaterials and can lead to a new strategy for the development of passive devices.In this review,the recent progress of ceramic-based dielectric metamaterials in electro-magnetic applications,energy applications,non-Hermitian systems,and natural materials with near-zero or negative refraction are summarized.The design principle and mechanism,as well as manufacturing technologies,are also introduced,and the current development trend of ceramic-based dielectric metamaterials are proposed.
基金Financial support provided by the National Natural Science Foundation of China(21606065,52072105,21676067,51972093,U1910210,and U1810204)the Anhui Provincial Natural Science Foundation(1708085QE98 and 1908085QE178)+3 种基金the Fundamental Research Funds for the Central Universities(PA2021KCPY0028,PA2021GDGP0059,JZ2018HGBZ0138,JZ2020YYPY0109,and PA2020GDJQ0026)the Australian Research Council(ARC)Discovery Project(DP180101453)the Key Technologies Research and Development Program of Anhui Province(202104a05020044)the Major Science and Technology Projects in Anhui Province(2021e03020001 and 202003a05020014)。
文摘Compared with other secondary batteries,lithium-sulfur batteries(LSBs)have unparalleled advantages such as high energy density,low cost,etc.In liquid LSB systems,it is extremely easy to cause severe‘‘shuttle effecto and safety issues.Hence,the development of solid-state LSBs(SSLSBs)has been attracting much more attention.As the most essential part of the SSLSBs,the solid-state electrolyte(SSE)has received significant attention from researchers.In this review,we concentrate on discussing the core of SSLSBs,which is the SSE.Moreover,we also highlight the differences in the properties of the different SSEs,which are polymer-based electrolytes and ceramic-based electrolytes.In addition,the challenges and advances in different types of SSEs are also compared and described systematically.Furthermore,the prospects for new SSE systems and the design of effective SSE structures to achieve highperformance SSLSBs are also discussed.Thus,this review is expected to give readers a comprehensive and systematic understanding of SSEs for SSLSBs.
文摘By means of different checks and measures, we obserced and analysed the microstructure of Fe-Al/ Al2O3 composite material, We found that not only intragranular nanostructure grains and rod-like crystals but also fine-grained structure of the composite material as well as the bridging of the Fe-Al intermetallics compound contribute to the material＇s strength and toughness, It is shoun that the strengthening and toughening of the Fe- Al/ Al2O3 composite is the joint effect of a multiplicute strengthening and tougheniug mechanism.
基金This work was supported by the National Key R&D Program of China(No.2022YFB3806000)the Basic Science Center Project of National Natural Science Foundation of China(No.52388201)+2 种基金the National Natural ScienceFoundationof China(Nos.52202370 and 52172122)the China Postdoctoral Science Foundation(No.2023T160359)the Natural Science Foundation of Shandong Province(No.ZR2023QF040)。
文摘In the upcoming 6-generation(6G)revolution,the achievement of low power consumption has become a key objective in research concerning terahertz devices.As an important component of passive devices,there are very few low-loss dielectric ceramics in the terahertz range.To elucidate the mechanism of loss and promote the application of microwave dielectric ceramics for future 6G technology(covering microwave and terahertz frequencies),the terahertz responses of ANb_(2)O_(6)(A=Zn,Co,Mn,and Ni)columbite niobates were studied.The influences of magnetic loss on the Qxf values in the microwave range with different transition metal ions in the A-site were reasonably analyzed.Moreover,due to the weakened magnetic relaxation properties in the terahertz range,the samples all exhibited low loss and approximate transparency,especially for MnNb_(2)O_(6) and NiNb_(2)O_(6)(tano<0.01 and absorption coefficient<10 cm^(-1) below 1.2 THz),which subverted the definition of traditional low-loss microwave dielectric ceramics.Ultimately,based on Mie theory,we designed a prototypical broadband metamaterial reflector to validate the applicability of the ANb_(2)O_(6) system in the terahertz band,which is highly important for the development of terahertz ceramic-based passive devices.
基金supported by the National Natural Science Foundation of China(No.52105211)the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(Grant No.2023-TS-04)the Research Fund of Pre-research Projects(No.0730-2411080386).
文摘This work used high velocity oxygen fuel spraying technology to prepare three types of ceramic-based self-lubricating sealing coating on C/SiC substrates,with Yttria-stabilized zirconia as the matrix and different mass fractions of Mo and Ag as lubricating phases.The compositions are S1(50%YSZ40%CaF_(2)10%Mo),S2(50%YSZ40%CaF_(2)10%Ag)and S3(40%YSZ30%CaF_(2)10%Mo10%Ag10%SiO_(2)).The friction coefficient and wear rate of the coating were examined at room temperature(RT),400℃and 800℃.The effects of different lubricating phases on the tribological properties of the coating were compared.The wear mechanism of the coating under different temperature environments will be revealed by clarifying the evolution law of the microstructure of the coating.The results show that the addition of Ag can improve the lubricating ability of the coating.Ag element forms a continuous and smooth tribo-layer on the sliding surface to reduce the friction coefficient of the coating.In addition,the lubricating effect of Ag element is more significant at medium and low temperatures.At 800℃,the S3 coating with both Ag and Mo exhibited excellent tribological properties.The wear mechanism of the coating is that it starts with adhesive wear and gradually transitions to abrasive wear as friction continues.This work provides theoretical support and experimental evidence for the construction of ceramic-based self-lubricating sealing coating with a wide temperature range.
