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将SiC颗粒和Fe基合金粉末经球磨后作为熔覆材料,在P20塑料模具钢表面采用激光熔覆技术制备了Fe基SiC金属陶瓷涂层。利用光学显微镜、X-射线衍射仪与数字显微硬度计对涂层的显微组织与硬度进行研究。结果表明:SiC颗粒几乎完全溶解,并与Fe基合金交互作用后,在树枝状晶过饱和马氏体α-Fe的枝晶间析出M7C3(M=Fe,Cr与Ni)型碳化物与Fe2Si型硅化物,涂层的平均显微硬度达572 HV0.2;获得的Fe基SiC金属陶瓷涂层无气孔与裂纹、与P20塑料模具钢呈冶金结合,硬度约是P20塑料模具钢的1.5倍。
SiC particles and Fe-based alloy powders were ball-milled as cladding materials, and Fe-based SiC cermet coatings were prepared on the surface of P20 plastic mold steel by laser cladding. The microstructure and hardness of the coatings were investigated by optical microscope, X-ray diffraction and digital microhardness tester. The results show that the SiC particles dissolve almost completely and interact with the Fe-based alloy. The M7C3 (M = Fe, Cr and Ni) carbides precipitate between the dendrites of the dendritic supersaturated martensite α-Fe and Fe2Si Type silicide coating with an average microhardness of 572 HV0.2. The obtained Fe-based SiC cermet coating has no pores and cracks and is metallurgically bonded with the P20 plastic mold steel and has a hardness of about 1.5 times that of the P20 plastic mold steel .