激光熔覆Ni基微－纳米WC金属陶瓷涂层组织及干滑动磨损性能
Microstructure and Wear Properties Under Dry Sliding for Micro-nano WC Composite Coatings Prepared by Laser Cladding
匡建新, 汪新衡, 黄开有
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作者单位：湖南工学院 机械工程系, 湖南 衡阳 421002
中文关键字：激光熔覆； 微-纳米WC； 复合涂层； 干滑动磨损
英文关键字：laser cladding; micro-nano WC; composite coating; dry sliding wear
中文摘要：在45钢表面进行添加微-纳米WC颗粒的镍基自熔粉末激光熔覆处理，得到不同Ni基WC合金涂层。对熔覆层进行显微组织观察、硬度测定以及室温干摩擦磨损试验。结果表明，纳米晶WC的加入能改善涂层的耐磨性能，在本试验条件下，当添加的纳米级WC和微米级WC各为15%时，涂层耐磨性能最佳；但纯纳米晶WC增强涂层耐磨性不佳，其主要磨损破坏方式随涂层中WC晶粒尺寸变化而有所变化。
英文摘要：The laser cladding was carried out on the surface of 45 steel using self-fused Ni-based ceramic powder with micro-nano WC particle. Different Ni-based WC composite coatings were formed. The microstructure of cross section was observed, the microhardness was measured, the wear properties under dry sliding and room temperature were checked. The results show that the wear resistance of coating is improved for the affiliation of nanostructure-WC. Under the experimental conditions, the coating with 15wt% nanostructure-WCl5wt% microstructure-WC can get the best wear performance, but the wear resistance of the coating only with nanostructure-WC is not perfect. And the main wear mechanism of the coating can alter as the difference of WC crystal size.