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以Ni-Cr-C-CaF_2复合合金粉末为原料,采用激光熔覆技术,在γ-TiAl合金基体表面制备出高温自润滑耐磨复合材料涂层,采用X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)等手段对所制备复合材料涂层的显微组织进行了分析。结果表明,该复合材料涂层由初生的短棒状或树枝状TiC和次生的块状Al_4C_3碳化物增强相以及细小、弥散、球状分布的CaF_2固体润滑颗粒均匀分布在塑韧性良好的NiCrAlTi(γ)固溶体基体中,其平均显微硬度约为HV 650,是基体TiAl合金的2倍。
The Ni-Cr-C-CaF 2 composite alloy powder was used as raw material to prepare the high temperature self-lubricating and wear-resistant composite coating on the γ-TiAl alloy substrate by laser cladding technique. XRD, SEM, (SEM) and energy dispersive spectrometer (EDS) were used to analyze the microstructure of the prepared composite coatings. The results show that the composite coating consists of primary short rod or dendritic TiC and secondary massive Al_4C_3 carbides reinforcing particles, and fine, dispersed and spherical CaF_2 solid lubricating particles uniformly distributed on the surface of NiCrAlTi (γ ) Solid solution matrix, the average microhardness is about HV650, which is twice that of the matrix TiAl alloy.