等离子熔覆镍基复合涂层的组织及性能  

Microstructure and Properties of Plasma Clad Ni Composite Coating

作　　者：刘胜林[1] 孙冬柏[1] 樊自拴[1] 俞宏英[1] 王旭东[1] 孟惠民[1] 李辉勤[1] 

机构地区：[1]北京科技大学腐蚀与防护中心,北京100083

出　　处：《稀有金属材料与工程》2006年第A02期232-235,共4页Rare Metal Materials and Engineering

基　　金：国家"863"计划(2002AA331080);北京市重大科技项目(H020420050021)资助

摘　　要：采用等离子熔覆工艺在不锈钢基材上熔覆镍基合金,获得了一定厚度的复合熔覆层。分析了熔覆层的显微组织、硬度和耐磨性及物相形貌和相结构等。结果表明:涂层中镶嵌着大量与基体合金结合良好的WC颗粒:熔覆过程中WC颗粒发生部分溶解;涂层与基板为冶金结合;所得涂层具有较高硬度,涂层基体硬度6000 MPa,WC颗粒硬度达18 780 MPa;熔覆层的土要强化机制是WC颗粒的弥散强化和C,Cr及B等合金元素溶入γ-Ni(Me)中产生的固溶强化。A composite coating was made on 1Cr18Ni9Ti steel substrate by plasma arc cladding with Ni and WC powders. The microstructural morphology and the phase structure were studied in detail. In the coating there is large quantity of WC particles, which are well bonded with the matrix alloy. Partial dissolution of WC particles occurred in the process of plasma cladding. The coating is metallurgical bonded with the substrate. The obtained composite coating has good hardness. The hardness for the matrix is 6000 MPa and up to 18780 MPa for the WC particles. The microstructural morphology and the phase structure were studied in detail. It is proved that the main hardening mechanism of the coating belongs to the dispersion hardening of WC particles in the γ-Ni（Me） matrix, the solution hardening duo to dissolving of C, Cr and B etc. into γ-Ni（Me）.

关 键 词：等离子熔覆 显微组织 显微硬度 

分 类 号：TG174[金属学及工艺—金属表面处理]