中文摘要：

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1058．3HV0．2；耐磨损性能也最好且主要以粘着磨损为主，磨损量为0．0011g，摩擦系数为0．181。

英文摘要：

Preparation of CNTs/SiC/Ni60A composite coating on the 45^# steel by using laser cladding technology with semiconductor lasers. The effect of CNTs content on the microstructure, wear resistance and microhardness of the alloy was analyzed by using Zeiss AxioVert. A1 of metallographic microscope, M-2000 wear test machine, HXD-1000TMB/LCD micro hardness of meter. And combined with SEM, EDS and XRD to carry out comprehensive and specific analysis for microscopic and physical. The results show that： with the increase of the content of CNTs, the microhardness and wear resistance were increased first and then decreased and the friction coefficient decreases first and then increases. When the content of CNTs reached 3 %, the macroscopic surface of the coating become smooth, without obvious pores and cracks. The microstructures of the coating is evenly distributed and mainly existed in the form of equiaxed crystal; and coating performance is best, microhardness of maxi- mum value is 1 058.3HV0.2. The wear resistance of the cladding coating is best and the worn mechanism is mainly adhesive wear. The wear volume is 0. 001 1 g and the coefficient of friction is 0. 181.