热处理对钛合金激光熔覆自润滑耐磨复合涂层组织和摩擦学性能的影响  

Effects of Heat Treatment on Microstructure and Tribological Properties of Self-Lubrication Anti-Wear Composite Coatings Prepared by Laser Cladding on Titanium Alloy

作　　者：翟永杰[1] 刘秀波[1,2] 乔世杰[1] 陆小龙[1] 余鹏程[1] 吴少华[3] 石皋莲[3] 

机构地区：[1]苏州大学机电工程学院,江苏苏州215006 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [3]苏州工业职业技术学院,江苏苏州215104

出　　处：《材料保护》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)

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.

关 键 词：TI6AL4V钛合金 激光熔覆层 热处理 耐磨减摩 自润滑 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG166.5[金属学及工艺—金属学]