添加CeO2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 CeO2
匡建新1, 汪新衡1, 唐明华1, 朱航生2
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作者单位：(1. 湖南工学院 机械工程系, 湖南 衡阳 421002; 2. 衡阳丰顺车桥有限公司 产品部, 湖南 衡阳 421002)
中文关键字：激光熔覆； CeO2稀土氧化物； 镍基WC金属陶瓷涂层； 高温干摩擦磨损
英文关键字：laser cladding; CeO2 rare-earth oxide; Ni-based WC metal-ceramic coating; dry friction and wear properties at high-temperature
中文摘要：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。
英文摘要：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.