采用激光熔覆技术在TC4基材表面制备了TiC+TiB₂增强Ni基自润滑复合涂层,研究了CeO₂含量对涂层物相组成、微观组织、显微硬度和摩擦磨损性能的影响。结果表明,添加不同CeO₂含量涂层的物相主要由基底γ-Ni、陶瓷增强相TiC和TiB₂、金属间化合物Ti₂Ni及润滑相Ti₃SiC₂组成。添加适量的CeO₂可以减小涂层增强相的尺寸,细化晶粒。当CeO₂添加量为1.5%时,涂层的显微硬度为1400 HV左右,涂层的最小摩擦系数为0.22~0.24,最小磨损量为1.7 mg,涂层具有良好的自润滑耐磨性能。

The TiC+TiB2 reinforced Ni-based self-lubricant composite coatings are prepared on the TC4 matrix surface by the laser cladding technique, and the effect of CeO2 content on the phase compositions, microstructures, microhardness and friction and wear performances of these coatings is investigated. The results show that the phase compositions of these coatings with different CeO2 contents are mainly composed of matrix γ-Ni, ceramic-reinforced phases of TiC and TiB2, intermetallic compound of Ti2 Ni, and lubricant phase of Ti3SiC2. The addition of suitable content of CeO2 can make the reinforced phase size decreased and grains refined. When the CeO2 content is 1.5%, the microhardness is around 1400 HV, the lowest friction coefficient is between 0.22 and 0.24, and the lowest wear mass loss is 1.7 mg, which indicate that these coatings possess nice self-lubricant and wear-resistant performances.