Microstructure and Wear Behavior of FeCoCrNiMo0.2 High Entropy Coatings Prepared by Air Plasma Spray and the High Velocity Oxy-Fuel Spray Processes
In the present research,the spherical FeCoCrNiMo0.2 high entropy alloy(HEA)powders with a single FCC solid solution structure were prepared by gas atomization.Subsequently,the FeCoCrNiMo0.2 coatings with a different content of oxide inclusions were prepared by air plasma spraying(APS)and high-velocity oxy-fuel spraying(HVOF),respectively.The microstructure,phase composition,mechanical properties,and tribological behaviors of these HEA coatings were investigated.The results showed that both HEA coatings showed a typical lamellar structure with low porosity.Besides the primary FCC phase,a mixture of Fe2O3,Fe3O4,and AB2O4(A = Fe,Co,Ni,and B = Fe,Cr)was identified as the oxide inclusions.The oxide content of the APS coating and HVOF coating was calculated to be 47.0%and 12.7%,respectively.The wear resistance of the APS coating was approximately one order of magnitude higher than that of the HVOF coating.It was mainly attributed to the self-lubricated effect caused by the oxide films.The mass loss of the APS coating was mainly ascribed to the breakaway of the oxide film,while the main wear mechanism of the HVOF coating was the abrasive wear.
high entropy thermal spray microstructure wear behavior
Li Tianchen Liu Yong Liu Bin Guo Wenmin Xu Liyou
State Key Laboratory for Powder Metallurgy,Central South University,Changsha 410083,China College of Mechanical and Energy Engineering,Shaoyang University,Shaoyang 422000,China
国际会议
北京
英文
1337-1348
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）