添加CeO_2激光熔覆Ni基WC金属陶瓷涂层的高温干摩擦磨损性能

High-temperature Dry Friction and Wear Properties of Ni-based WC Ceramic Coating by Laser Cladding Added CeO_2

采用CO2横流激光器在21-4-N耐热钢表面熔覆添加0.5%CeO2的不同成分Ni基WC金属陶瓷复合层;对熔覆层进行了显微组织观察、显微硬度测量以及不同温度下的高温干摩擦磨损试验。结果表明,Ni21+25%WC+0.5%CeO2熔覆层组织均匀细小,高温下以粘着磨损和氧化磨损为主,干摩擦磨损性能优良。

The Ni-based WC metal-ceramic coating with different Ni content and adding 0.5%CeO2 on the surface of 21-4-N heat-resisting steel was cladded by great power CO2 laser.The microstructure of the coating was observed.The microhardness,high-temperature dry friction and wear properties of the coating at different temperature were measured.The results show that the microstructure of Ni21＋20%WC＋0.5%CeO2 cladded layer is even small,adhesive wear and oxidation wear is the main mode at high temperature,and dry friction and wear properties are excellent.