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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。
The MoB / CoCr cermet coating was cladded on the surface of 45 steel by laser cladding, and the microstructure of MoB / CoCr coating was analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) And the hardness of the coating to be tested. The results show that: the cladding layer is dense, tightly bonded to the substrate and metallurgically bonded; the main phases of the cladding layer are CoMo2B2 and CoMoB, the main chemical components are Mo, Cr and Co, and the content of Fe in the alloying zone is obviously increase. Hardness tests show that the hardness of the cladding is more than 10 times the hardness of 45 steel.