激光熔覆Cu_(ss)/Cr_5Si_3金属硅化物复合涂层组织及耐磨性的研究  

Microstructure and Wear Resistance of Laser Clad Cu_(ss)/Cr_5Si_3 Metal Silicide Composite Coatings

作　　者：尹延西[1] 王华明[1] 

机构地区：[1]北京航空航天大学材料学院激光材料加工制造技术实验室,北京100083

出　　处：《摩擦学学报》2006年第3期214-217,共4页Tribology

基　　金：国家自然科学基金资助项目(50331010;50471006);航空基础科学基金资助项目(05H51009)

摘　　要：利用激光熔覆技术在奥氏体1Cr18N i9Ti不锈钢表面制备出由Cuss增韧铜基固溶体(Cr5S i3)金属硅化物新型耐磨复合涂层,分析了其显微组织,并在室温干滑动摩损条件下评价其耐磨性能.结果表明:涂层中高硬度耐磨相Cr5S i3得到Cuss基体的有力支撑,同时由于Cuss的高导热、低摩擦及自润滑效果,使得复合涂层在室温干滑动磨损条件下具有优异的耐磨性能;随着铜基固溶体体积分数增加,涂层的硬度和耐磨性明显降低.Wear resistant Cuss/Cr5Si3 metal silicide composite coating was fabricated on a substrate of an austenitic stainless steel 1Cr18Ni9Ti by laser cladding process. Microstructure of the Cuss/CrsSi3 metal silicide composite coating was characterized by OM, SEM, XRD and EDS. Microhardness was measured using a MH-6 semi-automatic Vickers micro-hardness tester. The volume fraction of Cuss has a remarkable influence on hardness and wear resistance of the coating. The hardness and the wear resistance of the coating increase with the decreasing volume fraction of Cuss. The laser clad Cuss/Cr5Si3 metal silicide composite coating exhibits excellent wear resistance under room-temperature dry sliding.

关 键 词：激光熔覆 金属硅化物 显微组织 耐磨性 

分 类 号：TH117.3[机械工程—机械设计及理论]