摘要
为了进一步提高钛合金激光熔覆层的质量,以Ni Cr/Cr_3C_2-WS2复合粉末为原料,采用激光熔覆技术在Ti6Al4V(TC4)钛合金表面制备了自润滑耐磨复合涂层,并将复合涂层在600℃下保温1 h,采用扫描电镜、X射线衍射仪、摩擦磨损试验系统地分析了涂层热处理前后的组织、显微硬度和摩擦学性能的变化及其机理,研究了热处理对自润滑耐磨复合涂层性能的影响。结果表明:自润滑耐磨复合涂层的主要物相为韧性相Ni Ti2,增强相Cr_3C_2、Cr7C_3、Ti C以及润滑相Ti_2SC、Cr S;热处理1 h后涂层的显微硬度(928.8 HV5 N)相对于未热处理涂层(1 076.1HV5 N)略有下降;相对于未热处理涂层,热处理1 h后的涂层表现出良好的耐磨减摩性能,其磨损机理为磨粒磨损。
NiCr/Cr_3C_2-WS_2 self-lubricating anti-wear composite coatings were obtained on Ti6A14 V alloy by laser cladding,and the coatings were heated at 600 ℃ for1 h.The microstructure,micro-hardness and tribological properties of coatings with and without heat treatment were investigated systematically by scanning electron microscope,X-ray diffractometer and friction-wear tests,and the effect of heat treatment on the performance of composite coating was studied further.Results showed that the main phases of self-lubricating anti-wear composite coatings was ductile- phase(NiTi_2),reinforced- phase(Cr_3C_2,Cr_7C_3 and TiC) and lubrication-phase(Ti_2SC,CrS).After heat treatment for 1 h,the micro-hardness of coaling slightly decreased to 928.8 HV_(5N) from 1 076.1 HV_(5N).Besides,compared with the coating without heat treatment,the coating after heat treatment for 1 h exhibited better anti- wear and friction reduction properties,and the wear mechanism was mainly slightly abrasive wear.
出处
《材料保护》
CAS
CSCD
北大核心
2016年第6期5-8,1,共4页
Materials Protection
基金
国家自然科学基金委员会-中国民航局民航联合研究基金(U1533101)
清华大学摩擦学国家重点实验室开放基金(SKLTKF15B01)
江苏高校品牌专业建设工程资助项目(PPZY2015B186)
关键词
TI6AL4V钛合金
激光熔覆层
热处理
耐磨减摩
自润滑
Ti6Al4V alloy
laser cladding
heat treatment
antiwear and friction reduction
self-lubrication
