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Corrosion mechanism of CuAl-NiC abradable seal coating system——The influence of porosity,multiphase,and multilayer structure on the corrosion failure 被引量:13
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作者 Yumeng Ni Fan Zhang +4 位作者 Demian I.Njoku Yingjie Yu Jinshan Pan Meijiang Meng Ying Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2021年第29期258-269,共12页
In this study,the corrosion behavior of the CuAl-NiC abradable seal coating system in chloride solution was investigated to systematically research the effect of porosity,multiphase,and multilayer structure on the cor... In this study,the corrosion behavior of the CuAl-NiC abradable seal coating system in chloride solution was investigated to systematically research the effect of porosity,multiphase,and multilayer structure on the corrosion failure.Through the composition and structure analysis,the corrosion process of the system was predicted and then verified with mercury intrusion porosimetry,cross-section SEM/EDS analysis,and electrochemical measurements.The results demonstrated that the interphase selective corrosion caused the porosity of the top layer to decrease first and then increase during the corrosion development.The interlayer galvanic corrosion,determined by the pore connectivity,is crucial for corrosion failure. 展开更多
关键词 Abradable seal coating system Galvanic corrosion MULTILAYER POROSITY
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Effect of carbon on microstructure of CrAlC_xN_(1-x) coatings by hybrid coating system 被引量:2
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作者 Sung-Kyu AHN Se-Hun KWON Kwang-Ho KIM 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第A01期78-82,共5页
A systematic investigation of the microstructure of CrA1CxN1-x coatings as a function of carbon contents was conducted. Quaternary CrA1CxN1-x coatings were deposited on Si wafers by a hybrid coating system combining a... A systematic investigation of the microstructure of CrA1CxN1-x coatings as a function of carbon contents was conducted. Quaternary CrA1CxN1-x coatings were deposited on Si wafers by a hybrid coating system combining an arc-ion plating technique and a DC reactive magnetron sputtering technique using Cr and AI targets in the Ar/N2/CH4 gaseous mixture. The effect of carbon content on microstructure of CrA1C^N~ x coatings was investigated with instrumental analyses of X-ray diffraction, X-ray photoelectron, and high-resolution transmission electron microscopy. The results show that the carbon content of CrA1CxN1-x coatings linearly increases with increasing CH4/(CH4/N2) gas flow rate ratio. The surface roughness of the CrA1CxN1-x coating layer decreases with the increase of carbon content. 展开更多
关键词 CrA1C N1-x coating NANOCOMPOSITE MICROSTRUCTURE hybrid coating system
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Evaluation of long-term corrosion durability and self-healing ability of scratched coating systems on carbon steel in a marine environment
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作者 赵霞 陈长伟 +3 位作者 徐玮辰 朱庆军 戈成岳 侯保荣 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2017年第5期1094-1107,共14页
Defects in protective-coating systems on steel surfaces are inevitable in practical engineering applications. A composite coating system, including a primer, middle coat and topcoat, were used to protect carbon steel ... Defects in protective-coating systems on steel surfaces are inevitable in practical engineering applications. A composite coating system, including a primer, middle coat and topcoat, were used to protect carbon steel from corrosion in a marine environment. Two environmental additives, glass fibers and thiourea, were applied in the middle coat to modify the coating system. The long-term corrosion durability and self-healing ability of the scratched coating system were evaluated by multiple methods. Results of the electrochemical technologies indicated that the coating system that contained 0.5 wt.% fibers and 0.5 wt.% thiourea presented good corrosion protection and self-healing for carbon steel when immersed in 3.5% NaCl for 120 d. Evolution of localized corrosion factors with time, as obtained from the current distribution showed that fibers combined with thiourea could inhibit the occurrence of local corrosion in scratched coating systems and retarded the corrosion development significantly. Surface characterization suggested that adequate thiourea could be absorbed tmiformly on fibers for a long time to play an important role in protecting the carbon steel. Finally, schematic models were established to demonstrate the action of fibers and thiourea on the exposed surface of the carbon steel and the scratched coating system in the entire deterioration process. 展开更多
关键词 scratched coating system CORROSION carbon steel LONG-TERM SELF-HEALING
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Preparation and Characterization of Controlled Heparin Release Waterborne Polyurethane Coating Systems 被引量:6
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作者 Yuan-qing Song Yun-long Gao +6 位作者 Zhi-cheng Pan Yi Zhang 李洁华 Kun-jie Wang Jian-shu Li 谭鸿 Qiang Fu 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2016年第6期679-687,共9页
In this study, to improve hemocompatibility of biomedical materials, a waterborne polyurethane (WPU)haepafin release coating system (WPU/heparin) is fabricated via simply blending biodegradable WPU emulsions with ... In this study, to improve hemocompatibility of biomedical materials, a waterborne polyurethane (WPU)haepafin release coating system (WPU/heparin) is fabricated via simply blending biodegradable WPU emulsions with heparin aqueous solutions. The surface compositions and hydrophilicity of these WPU/heparin blend coatings are characterized by attenuated total reflectance infrared spectroscopy (ATR-FTIR) and water contact angle measurements. These WPU/heparin blend coatings show effectively controlled release of heparin, as determined by the toluidine blue method. Furthermore, the biocompatibility and anticoagulant activity of these blend coatings are evaluated based on the protein adsorption, platelet adhesion, activated partial thromboplastin time (APTT), thrombin time (TT), hemolysis, and cytotoxicity. The results indicate that better hemocompatibility and cytocompatilibity are obtained due to blending heparin into this waterborne polyurethane. Thus, the WPU/heparin blend coating system is expected to be valuable for various biomedical applications. 展开更多
关键词 Waterborne polyurethane HEPARIN Blend coating Hemocompatibility.
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Improvement of thermally grown oxide layer in thermal barrier coating systems with nano alumina as third layer 被引量:6
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作者 Mohammadreza DAROONPARVAR Muhamad Azizi Mat YAJID +5 位作者 Noordin Mohd YUSOF Saeed FAR AHANY Mohammad Sakhawat HUSSAIN Hamid Reza BAKHSHESHIRAD Z.VALEFI Ahmad ABDOLAHI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第5期1322-1333,共12页
A thermally grown oxide(TGO)layer is formed at the interface of bond coat/top coat.The TGO growth during thermal exposure in air plays an important role in the spallation of the ceramic layer from the bond coat.High t... A thermally grown oxide(TGO)layer is formed at the interface of bond coat/top coat.The TGO growth during thermal exposure in air plays an important role in the spallation of the ceramic layer from the bond coat.High temperature oxidation resistance of four types of atmospheric plasma sprayed TBCs was investigated.These coatings were oxidized at 1000°C for 24,48 and 120 h in a normal electric furnace under air atmosphere.Microstructural characterization showed that the growth of the TGO layer in nano NiCrAlY/YSZ/nano Al2O3 coating is much lower than in other coatings.Moreover,EDS and XRD analyses revealed the formation of Ni(Cr,Al)2O4 mixed oxides(as spinel)and NiO onto the Al2O3(TGO)layer.The formation of detrimental mixed oxides(spinels)on the Al2O3(TGO)layer of nano NiCrAlY/YSZ/nano Al2O3 coating is much lower compared to that of other coatings after 120 h of high temperature oxidation at 1000°C. 展开更多
关键词 high temperature oxidation nano thermal barrier coatings TGO layer SPINELS
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Investigation on behavior of crack penetration/deflection at interfaces in intelligent coating system 被引量:3
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作者 Yang SUN Wenjuan WANG +1 位作者 Binbin LI Mabao LIU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2015年第4期465-474,共10页
Based on the three-phase model, the propagation behavior of a matrix crack in an intelligent coating system is investigated by an energy criterion. The effect of the elastic mismatch parameters and the thickness of th... Based on the three-phase model, the propagation behavior of a matrix crack in an intelligent coating system is investigated by an energy criterion. The effect of the elastic mismatch parameters and the thickness of the interface layer on the ratio of the energy release rate for infinitesimal deflected and penetrated crack is evaluated with the finite element method. The results show that the ratio of the energy release rates strongly depends on the elastic mismatch al between the substrate and the driving layer. It also strongly depends on the elastic mismatch a2 between the driving layer and the sensing layer for a thinner driving layer when a primary crack reaches an interface between the substrate and the driving layer. Moreover, with the increase in the thickness of the driving layer, the dependence on a2 gradually decreases. The experimental observation on aluminum alloys monitored with intelligent coating shows that the established model can better explain the behavior of matrix crack penetration and can be used in optimization design of intelligent coating. 展开更多
关键词 intelligent coating energy criterion INTERFACE crack deflection crackpenetration finite element method
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Methodology for predicting the life of plasma-sprayed thermal barrier coating system considering oxidation-induced damage 被引量:3
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作者 Keekeun Kim Damhyun Kim +2 位作者 Kibum Park Junghan Yun Chang-Sung Seok 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第10期45-56,共12页
The lifespan of plasma-sprayed thermal barrier coating(TBC)systems is difficult to predict owing to the variety of microstructures and deterioration histories.In this study,we developed a novel TBC damage model to ref... The lifespan of plasma-sprayed thermal barrier coating(TBC)systems is difficult to predict owing to the variety of microstructures and deterioration histories.In this study,we developed a novel TBC damage model to reflect deterioration histories;thus,it can be applied to various TBCs.Damage to TBCs is classifed into oxidation and mechanical damage;therefore,a detailed deterioration history can be reflected.In addition,by introducing a virtual S–N diagram,a life prediction model that can be applied to TBCs with various microstructures was established.We used the proposed damage and life prediction models in isothermal aging and thermal cycle tests with different aging cycles.The predicted lifespan of TBCs by using the proposed models was within 95%of the results obtained by performing actual tests in the temperature range of 1150–1350℃. 展开更多
关键词 Thermal barrier coatings Damage model Temperature history Thermal fatigue Life prediction model
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Oxidation and Hot Corrosion Behavior of a Composite Coating System 被引量:1
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作者 Dongbai XIE and Fuhui WANGState Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2003年第6期567-570,共4页
The oxidation and hot corrosion behavior of Co-Ni-Cr-AI-Ta-Y coating produced by magnetron sputtering with and without enamel coating has been investigated in air at 900℃ and in molten 75 wt pct NaCl+25 wt pct Na2SO4... The oxidation and hot corrosion behavior of Co-Ni-Cr-AI-Ta-Y coating produced by magnetron sputtering with and without enamel coating has been investigated in air at 900℃ and in molten 75 wt pct NaCl+25 wt pct Na2SO4 at 850℃. The results show that the enamel coating possesses good hot corrosion resistance in the molten salts, in comparison with the sputtered Co-Ni-Cr-AI-Ta-Y coating. In the hot corrosion test, breakaway corrosion did not occur on the samples with enamel coating and the composition of enamel coating did not significantly change either. The oxidation resistance of the sputtered coating, which offers good adhesion, can be improved by the enamel coating. 展开更多
关键词 Enamel coating Sputtered coating Hot corrosion Isothermal oxidation
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Thermal properties of glass-ceramic bonded thermal barrier coating system 被引量:1
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作者 S.GHOSH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第2期457-464,共8页
The thermal properties of a thermal barrier coating (TBC) system comprised of BaO-MgO-SiO_2 based glass-ceramic bond coating, 8% (mass fraction) yttria stabilized zirconia (8YSZ) top coating and nimonic alloy su... The thermal properties of a thermal barrier coating (TBC) system comprised of BaO-MgO-SiO_2 based glass-ceramic bond coating, 8% (mass fraction) yttria stabilized zirconia (8YSZ) top coating and nimonic alloy substrate were evaluated. The thermal diffusivity and thermal conductivity of the TBC coated substrate were lower than those of bare substrate and glass-ceramic coated substrate under identical conditions. The specific heat capacity, thermal diffusivity and thermal conductivity of the TBC coated substrate increase with the increase of the temperature. Further, it is observed that the thermal conductivity of the TBC system decreases with the increase in the top coating thickness. 展开更多
关键词 vglass-ceramic coating thermal barrier coating thermal properties yttria stabilized zirconia
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Weakening effect of plastic yielding inception in thin hard coating systems 被引量:1
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作者 Xiao Huang Shujun Zhou Tianmin Shao 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第3期493-501,共9页
Hard coatings have been widely applied to enhance tribological performance of mechanical components.However,it was predicted that thin hard coatings may have a weakening effect which could reduce the coating/substrate... Hard coatings have been widely applied to enhance tribological performance of mechanical components.However,it was predicted that thin hard coatings may have a weakening effect which could reduce the coating/substrate system’s resistance to plastic yielding compared with the uncoated substrate material.In this paper,analytical simulation is utilized to investigate the origin of weakening effect.The functions of material mechanical properties and coating thickness on the weakening effect are theoretically investigated.Partial-unloading spherical nanoindentation tests are performed on tungsten coated single crystalline silicon and copper to acquire the stress-strain curves and compared with the uncoated cases.The experimental results are in consistence with the analytical solutions,demonstrating the presence of weakening effect. 展开更多
关键词 plastic yielding weakening effect spherical nanoindentation PVD coating
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Experimental study on the interfacial delamination in a thermal barrier coating system at elevated temperatures 被引量:1
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作者 Peng-fei ZHAO Fu-lin SHANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2010年第10期794-803,共10页
The failure mode and adhesion of thermal barrier coating (TBC) 8YSZ (ZrO2+8% (w/w) Y2O3) deposited on NiCoCrAlTaY bond coat by atmospheric plasma spraying were investigated. A grooved modified three-point bending spec... The failure mode and adhesion of thermal barrier coating (TBC) 8YSZ (ZrO2+8% (w/w) Y2O3) deposited on NiCoCrAlTaY bond coat by atmospheric plasma spraying were investigated. A grooved modified three-point bending specimen that can generate a single interface crack to facilitate the control of crack growth was adopted for testing, which was conducted at the ambient temperature of 100 °C. The morphology and composition of fractured surfaces were examined by means of a scanning electron microscopy (SEM) and an energy disperse spectroscopy (EDS). Images and spectrum show that cracks are initiated and propagated exclusively within YSZ layer adjacent to top/bond coat interface. The load-displacement curves obtained exhibit similar shapes that indicate two distinct stages in crack initiation and stable crack growth. Finite element analyses were performed to extract the adhesion strength of the TBCs. The delamination toughness of the plasma-sprayed 8YSZ coatings at 100 °C, in terms of critical strain energy release rate Gc, can be reliably obtained from an analytical solution. 展开更多
关键词 Thermal barrier coating (TBC) Three-point bending test Finite element analysis Delamination toughness
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Rheological Behaviour, Synthesis and Performance of Smart Thermal Barrier Coating Systems Based on Hollow Alumina 被引量:1
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作者 F. Pedraza B. Rannou +2 位作者 G. Boissonnet B. Bouchaud Z. Maache-Rezzoug 《Journal of Materials Science and Chemical Engineering》 2015年第12期17-22,共6页
The stability of three water-based slurries containing different loads of Al microparticles was measured by laser scattering. The slurries displayed a Newtonian behaviour and the evolution of viscosity over nine days ... The stability of three water-based slurries containing different loads of Al microparticles was measured by laser scattering. The slurries displayed a Newtonian behaviour and the evolution of viscosity over nine days was found to be constant. Ground surfaces of nickel were also wetted similarly irrespective of the Al content in the slurries (30, 40 or 50 wt%) thereby demonstrating that the 1/10 PVA/H2O water based slurries are adequate for spraying. After deposition and annealing of the as-sprayed coatings, a thermal barrier coating system was formed with a top coat of hollow alumina spheres, an intermediate thermally grown oxide and a bottom aluminized bond coat. The coating system is shown to display very low thermal conductivity and remarkable oxidation resistance at high temperatures. 展开更多
关键词 SLURRY Viscosity WETTING THERMAL Barrier coating THERMAL CONDUCTIVITY Oxidation
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Optimization and Sensitivity Analysis of Non-Isothermal Carreau Fluid Flow in Roll Coating Systems with Fixed Boundary Constraints:A Comparative Investigation
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作者 Mujahid Islam Fateh Ali +2 位作者 Xinlong Feng M.Zahid Sana Naz Maqbool 《Computer Modeling in Engineering & Sciences》 2025年第12期3511-3561,共51页
Roll coating is a vital industrial process used in printing,packaging,and polymer film production,where maintaining a uniform coating is critical for product quality and efficiency.This work models non-isothermal Carr... Roll coating is a vital industrial process used in printing,packaging,and polymer film production,where maintaining a uniform coating is critical for product quality and efficiency.This work models non-isothermal Carreau fluid flow between a rotating roll and a stationary wall under fixed boundary constraints to evaluate how non-Newtonian and thermal effects influence coating performance.The governing equations are transformed into non-dimensional form and simplified using lubrication approximation theory.Approximate analytical solutions are obtained via the perturbation technique,while numerical results are computed using both the finite difference method and the BVPMidrich technique.Furthermore,Response surface methodology(RSM)is employed for optimization and sensitivity analysis.Analytical and numerical results show strong agreement(<1%deviation).The model predicts coating thickness 0.55≤λ≤0.64,power input 1.05≤P_(w)≤1.99,and separation force 0.91≤S_(f)≤1.82 for 0.1≤We≤0.9 and 0.01≤F≤0.09.Increasing We enhances the coating thickness and power input but reduces velocity and separation force.The findings provide physical insight into elastic and viscous effects in roll coating,providing insight for optimizing coating uniformity,minimizing wear,improving industrial coating processes,and extending substrate lifespan. 展开更多
关键词 Roll coating process finite difference method carreau fluid model sensitivity analysis response surface methodology lubrication theory
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High-temperature oxidation resistance of TiB_(2)coatings on molybdenum produced by molten salt electrophoretic deposition
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作者 Qian Kou Chuntao Ge +6 位作者 Yanlu Zhou Wenjuan Qi Junjie Xu Weiliang Jin Jun Zhang Hongmin Zhu Saijun Xiao 《International Journal of Minerals,Metallurgy and Materials》 2026年第1期282-291,共10页
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
关键词 molten salt electrophoretic deposition MOLYBDENUM TiB_(2)coating high-temperature oxidation resistance
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Role of coatings and materials of external fixation pins on the rates of pin tract infection:A systematic review and meta-analysis 被引量:2
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作者 Cristhopher Stoffel Bruno Eltz Mauro Jose Salles 《World Journal of Orthopedics》 2021年第11期920-930,共11页
BACKGROUND Infection at the pin tract is a frequent and feared complication of external fixators(EF).The type of pin material and coatings have been regarded as possibly influencing infection rates.Over the last 20 ye... BACKGROUND Infection at the pin tract is a frequent and feared complication of external fixators(EF).The type of pin material and coatings have been regarded as possibly influencing infection rates.Over the last 20 years,few prospective clinical studies and systematic reviews addressed the role of coated pins on the rate of pin site infection in human clinical studies.AIM To assess the EF literature over the past 20 years on the clinical benefits of pins manufactured from varied materials and coating systems and their possible role in pin tract infection rates.METHODS We performed a systematic review according to the PRISMA and PICOS guidelines using four scientific platforms:PubMed,LiLacs,SciELO,and Cochrane.We searched the literature for related publications over the past 20 years.RESULTS A literature search yielded 29 articles,among which seven met the inclusion criteria.These studies compared stainless-steel pins and pins coated with hydroxyapatite(HA),titanium and silver.The pin tract infection definitions were arbitrary and not standardized among studies.Most studies included a low number of patients in the analysis and used a short follow-up time.Three metaanalyses were carried out,comparing stainless steel vs silver pins,stainless steel vs HA-coated pins,and titanium vs HA-coated pins.None of this analysis resulted in statistically significant differences in pin tract infection rates.CONCLUSION Currently,no clinical evidence supports the advantage of EF pins manufactured with materials other than stainless steel or coated over uncoated pins in reducing the rates of pin tract infections.A standardized definition of pin tract infection in external fixation is still lacking. 展开更多
关键词 External fixator Pin tract infection Stainless steel pin Coated pin coating systems Pin site infection
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Simulation of residual stresses and their effects on thermal barrier coating systems using finite element method 被引量:15
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作者 ZHU JianGuo CHEN Wei XIE HuiMin 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第3期49-58,共10页
Thermal barrier coating(TBC)systems are widely used in industrial gas-turbine engines.However,premature failures have impaired the use of TBCs and cut down their lifetime,which requires a better understanding of their... Thermal barrier coating(TBC)systems are widely used in industrial gas-turbine engines.However,premature failures have impaired the use of TBCs and cut down their lifetime,which requires a better understanding of their failure mechanisms.In the present study,experimental studies of isothermal cycling are firstly carried out with the observation and estimation of microstructures.According to the experimental results,a finite element model is established for the analysis of stress perpendicular to the TBC/BC interface.Detailed residual stress distributions in TBC are obtained to reflect the influence of mechanical properties,oxidation,and interfacial roughness.The calculated results show that the maximum tensile stress concentration appears at the peak of TBC and continues to increase with thermal cycles.Because of the microstructural characteristics of plasma-sprayed TBCs,cracks initialize in tensile stress concentration(TSC)regions at the peaks of TBC and propagate along the TBC/BC interface resulting in the spallation of TBC.Also,the inclusion of creep is crucial to failure prediction and is more important than the inclusion of sintering in the simulation. 展开更多
关键词 residual stress failure mechanism finite element method thermal barrier coating
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Potential bioactive coating system for high-performance absorbable magnesium bone implants 被引量:7
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作者 Murni Nazira Sarian Nida Iqbal +4 位作者 Pedram Sotoudehbagha Mehdi Razavi Qamar Uddin Ahmed Cortino Sukotjo Hendra Hermawan 《Bioactive Materials》 SCIE 2022年第6期42-63,共22页
Magnesium alloys are considered the most suitable absorbable metals for bone fracture fixation implants.The main challenge in absorbable magnesium alloys is their high corrosion/degradation rate that needs to be contr... Magnesium alloys are considered the most suitable absorbable metals for bone fracture fixation implants.The main challenge in absorbable magnesium alloys is their high corrosion/degradation rate that needs to be controlled.Various coatings have been applied to magnesium alloys to slow down their corrosion rates to match their corrosion rate to the regeneration rate of the bone fracture.In this review,a bioactive coating is proposed to slow down the corrosion rate of magnesium alloys and accelerate the bone fracture healing process.The main aim of the bioactive coatings is to enhance the direct attachment of living tissues and thereby facilitate osteoconduction.Hydroxyapatite,collagen type I,recombinant human bone morphogenetic proteins 2,simvastatin,zoledronate,and strontium are six bioactive agents that show high potential for developing a bioactive coating system for high-performance absorbable magnesium bone implants.In addition to coating,the substrate itself can be made bioactive by alloying magnesium with calcium,zinc,copper,and manganese that were found to promote bone regeneration. 展开更多
关键词 Absorbable metals Bioactive agent Bone fracture coating Magnesium alloys
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Stability of NiCrAlY coating/titanium alloy system under pure thermal exposure 被引量:3
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作者 Xiao-Min Peng An-Ru Wu +3 位作者 Li-Jun Dong You-Rui Tao Wei-Guo Gao Xiang-Lin Zhou 《Rare Metals》 SCIE EI CAS CSCD 2017年第8期659-665,共7页
In this paper,NiCrAlY coating was deposited on TC4 titanium alloy using arc ion plating,and the stability of NiCrAlY coating/TC4 substrate system under pure thermal exposure was analyzed in a wide temperature range.Du... In this paper,NiCrAlY coating was deposited on TC4 titanium alloy using arc ion plating,and the stability of NiCrAlY coating/TC4 substrate system under pure thermal exposure was analyzed in a wide temperature range.During the thermal exposure,β→γ′→γphase transformation takes place in the NiCrAlY coating.The NiCrAlY coating phases totally decompose above the allotropic transformation temperature of TC4.The allotropic transformation ofα-Ti to β-Ti of the substrate significantly influences the stability of NiCrAlY coating/TC4 substrate system.NiCrAlY coating elements are mainly consumed by interfacial reactions below the allotropic transformation temperature of TC4.Above the allotropic transformation temperature of TC4,NiCrAlY coating elements are mainly consumed by element dissolution in β-Ti.The NiCrAlY coating totally degrades for the dissolution of coating elements in the substrate to form thickβ-Ti stabilized layer. 展开更多
关键词 NiCrAlY coating Titanium alloy STABILITY Pure thermal exposure DEGRADATION
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Effects of yttria content on the CMAS infiltration resistance of yttria stabilized thermal barrier coatings system 被引量:3
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作者 Juan JGomez Chavez Ravisankar Naraparaju +3 位作者 Peter Mechnich Klemens Kelm Uwe Schulz C.V.Ramana 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2020年第8期74-83,共10页
The effects of YO(1.5)doping in yttria-zirconia based thermal barrier coatings(TBCs)against CMAS interaction/infiltration are discussed.The TBCs with an YO(1.5)content ranging from 43–67 mol.%(balance Zr O2)were prod... The effects of YO(1.5)doping in yttria-zirconia based thermal barrier coatings(TBCs)against CMAS interaction/infiltration are discussed.The TBCs with an YO(1.5)content ranging from 43–67 mol.%(balance Zr O2)were produced by electron beam physical vapor deposition(EB-PVD)techniques.The results reveal a trend of higher apatite formation probability with the higher free YO(1.5)available in the yttriazirconia system.Additionally,the infiltration resistance and amount of consumed coating appears to be strongly dependent on the YO(1.5)content in the coating.The thinnest reaction layer and lowest infiltration was found for the highest produced 67 YO(1.5)coating.Complementary XRD experiments with volcanic ash/YO(1.5)powder mixtures with higher yttria contents than in the coatings(80 YO(1.5)and pure YO(1.5))also showed higher apatite formation with respect to increasing yttria content.The threshold composition to promote apatite-based reaction products was found to be around 50 YO(1.5)in zirconia which was proved in the coatings and XRD powder experiments.An YO(1.5)-ZrO2-Fe O-TiO2 bearing zirconolite-type phase was formed as a reaction product for all the coating compositions which implicates that TiO2 in the melt acts as a trigger for zirconolite formation.This phase could be detrimental for CMAS/volcanic ash infiltration resistance since it can be formed alongside with apatite which controls or limits the amount of Y^(3+)available for glass crystallization.The Fe rich garnet phase containing all the possible elements exhibited a slower nucleation compared to apatite and its growth was enhanced with slow cooling rates.The implications of phase stability and heat treatment effects on the reaction products are discussed for tests performed at 1250°C. 展开更多
关键词 CMAS Volcanic ash INFILTRATION Electron beam physical vapor deposition Thermal barrier coating
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Computerized three-dimensional design system for rectangular tile coating on hull surface 被引量:4
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作者 CHEN Zhi-biao ZHAO Yao YAN Jun 《Journal of Marine Science and Application》 2006年第2期13-18,共6页
To better guide the coating process of rectangular tiles on a ship hull, a computerized three-dimensional design method is proposed. Research was done on a tile generating algorithm, tile laying design flow, tiles gap... To better guide the coating process of rectangular tiles on a ship hull, a computerized three-dimensional design method is proposed. Research was done on a tile generating algorithm, tile laying design flow, tiles gap examination algorithm, and tiles slight displacement, as well as cutting and rotating algorithms.A three-dimensional design system was developed using an MDT platform. The application of this system indicates that using the design arrangement to coat tiles on a ship’s hull can result in enhanced coating quality. 展开更多
关键词 rectangular tile hull coating ship design
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