摘要
采用大气等离子喷涂技术制备了CoCrAl-B4C涂层,测试了涂层的硬度、结合强度、热震性能及不同条件下的摩擦系数。结果表明:涂层的平均显微硬度为980HV0.2,平均结合强度为17.5MPa,经900℃水淬热震循环10次仍然完好;涂层经700℃热处理后,摩擦系数较低且波动小,水蒸气的存在有利于涂层摩擦系数的降低,其主要原因是涂层表面在热处理与摩擦过程中生成了B2O3和H3BO3自润滑相。
CoCrAl-B4C coating was successfully deposited by air plasma spray technology. The coating micro-structure, microhardness, bonding strength, thermal shock and tribological performance were analyzed. The results show that the microhardness and bonding strength of CoCrALB4C coating are 980HV0.2 and 17.5 MPa respectively, and no failure occurs after ten time＇s thermal shock tests at 900 ℃ The lower friction coefficients of CoCrAl-B4 C coating appear when the coating in water vapor atmosphere or preheating treatment at 700℃, which are attributed to the formation of B2O3 and Ha BO3 lubricating phases on the worn surface.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2012年第3期1-4,共4页
Surface Technology
基金
国家自然科学基金(51001093)
江苏省自然科学基金(BK2011452)
关键词
等离子喷涂
碳化硼
微观结构
力学性能
自润滑
plasma spray
boron carbide
microstructure
mechanical properties
solid lubrication
