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采用激光熔覆技术用半导体激光器在45~#钢上制备了CNTs/SiC/Ni60A复合涂层,分别运用蔡司AxioVert.A1金相显微镜、M-2000型磨损试验机、HXD-1000TMB/LCD显微硬度计研究了CNTs含量对合金显微组织、磨损性能、显微硬度的影响,并结合了SEM、EDS和XRD对涂层进行了更综合、具体的显微分析和物相分析。研究表明,随着CNTs含量的增大,涂层的显微硬度和耐磨性均先增大后降低;而摩擦系数则先减小后增大,当CNTs含量为3%时,涂层宏观表面光滑,未见明显的气孔和裂纹;涂层显微组织分布均匀,主要以等轴晶形式存在,且涂层性能也最好,显微硬度最大值为1 058.3HV0.2;耐磨损性能也最好且主要以粘着磨损为主,磨损量为0.001 1g,摩擦系数为0.181。
The CNTs / SiC / Ni60A composite coatings were prepared on 45 ~ # steel by laser cladding using a laser diode. The microstructures of the CNTs / SiC / Ni60A coatings were characterized by ZEISS AxioVert.A1 microscope, M-2000 wear tester and HXD-1000TMB / The effects of CNTs content on the microstructure, wear properties and microhardness of the alloy were investigated by hardness tester. The microstructure and phase analysis of the coating were also investigated by SEM, EDS and XRD. The results show that with the increase of CNTs content, the microhardness and wear resistance of the coatings first increase and then decrease, while the friction coefficient first decreases and then increases. When CNTs content is 3% Smooth surface, no obvious pores and cracks; coating microstructure evenly distributed, mainly in the form of equiaxed grains, and the coating performance is also the best, the maximum microhardness of 1 058.3HV0.2; wear Performance is also the best and mainly sticking wear-based, wear volume of 0.001 1g, the friction coefficient of 0.181.