采用激光熔覆技术在45钢基体表面熔覆MoB/CoCr金属陶瓷覆层,对MoB/CoCr覆层进行X射线衍射（XRD）、扫描电镜（SEM）、能谱（EDS）的微观组织结构分析和对覆层的硬度进行测试。结果表明：熔覆层组织致密,与基体结合牢固且呈冶金结合;熔覆层的主要物相为CoMo2B2和CoMoB,主要的化学成分是Mo、Cr和Co,合金化区中Fe元素的含量明显增加。硬度测试表明熔覆层的硬度值是45钢硬度值的10倍以上。
MoB/CoCr cermet coating was prepared on 45 steel surface by laser cladding. Microstructure of MoB/CoCr coating was characterized by XRD, SEM and EDS,and mierohardness of the coating was also studied. The results show that MoB/CoCr cermet coating with metallurgical bonding to substrate is dense. The main phases of the cladding layer are CoMo2B2and CoMoB, and its main chemical composition is Mo, Cr and Co, the content of Fe increases obviously in the alloying zone of the cladding layer. The hardness of the cladding layer is much higher than that of the substrate.
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