等离子熔敷Cr_7C_3金属陶瓷增强复合涂层组织与耐磨性研究  

Study on Microstructure and Wear Resistance of Plasma Clad Cr_7C_3/γ-Fe Ceramal Reinforced Composite Coating

作　　者：刘元富[1] 韩建民[1] 徐向阳[1] 李荣华[1] 李卫京[1] 

机构地区：[1]北京交通大学机电工程学院材料研究所,北京100044

出　　处：《摩擦学学报》2006年第3期270-274,共5页Tribology

基　　金：国家高技术研究发展计划(863计划)资助项目(2003AA331190)

摘　　要：利用等离子熔敷技术,以Fe-Cr-C合金粉末为原料在正火态C级钢表面制备出Cr7C3金属陶瓷增强复合涂层,分析了复合涂层的显微组织结构,评价了复合涂层在室温干滑动磨损条件下的耐磨性.结果表明:等离子熔敷Cr7C3金属陶瓷增强复合涂层的组织均匀、与基材之间为完全冶金结合,涂层显微组织为规则块状Cr7C3金属陶瓷相均匀分布于Cr7C3与γ-Fe固溶体构成的共晶基体上,其硬度较高;涂层在室温干滑动磨损条件下表现出优异的耐磨性,复合涂层磨损质量损失随载荷增加变化缓慢.Cr7 C3 ceramal reinforced composite coating was fabricated on substrate of a normalized carbon steel by plasma cladding using Fe-Cr-C alloy powders. Microstructure of the composite coating was characterized. Wear resistance of the coating was evaluated under dry sliding test condition at room temperature. Results indicate that plasma clad Cr7C3 ceramal reinforced composite coating has a fine and homogeneous microstructure consisting of Cr7C3 ceramal primary particles uniformly distributed in the Cr7C3/γ-Fe eutectic matrix and is metallurgically bonded to the carbon steel. The plasma clad composite coating has high hardness and excellent wear resistance under dry sliding condition. With increasing load, volume loss of the composite coating increaseds very slowly.

关 键 词：等离子熔敷 Cr7C3 涂层 磨损性能 

分 类 号：TG115[金属学及工艺—物理冶金] TH117.3[金属学及工艺—金属学]