在Ti和h-BN粉末中添加不同含量的CeO2作为原料, 采用激光熔覆技术在Ti3Al2V表面原位合成TiB/TiN复合陶瓷强化涂层。通过测试分别研究了不同含量的CeO2对熔覆层的强化相微观组织形貌、显微硬度和摩擦磨损性能的影响。结果表明, 熔覆层原位合成了TiB和TiN强化相; 通过添加适量的CeO2, 熔覆层中的强化相变得更加细小, 组织分布更加均匀, 硬度和摩擦磨损性能得到提高。CeO2加入量的质量分数为2%时, 熔覆层的表层硬度可达1400 HV, 耐磨损性能最佳。

The TiN/TiB-reinforced titanium matrix composite coatings are prepared on the surface of Ti3Al2V by laser cladding using different CeO2 contents in Ti and h-BN powders as the raw materials. The effects of different CeO2 contents on the strengthening phase microstructure morphology, microhardness and wear property of the laser cladding coating are studied and characterized. The results indicate that the cladding layers of TiB and TiN matrix composite is in-situ synthesized. The addition of appropriate CeO2 refines the structure of the reinforced phase, enhances the microstructural uniformity and improves the microhardness and wear property of coating. When the mass fraction of CeO2 is 2%, the surface hardness of the coatings is up to 1400 HV, and the wear property of coating is optimum.