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向WC陶瓷镍基合金粉末中添加不同质量分数的La2O3粉末制成混合粉末,采用大功率半导体激光器通过同轴送粉方式,在A3钢基材上制备熔覆层。利用SEM、EDAX、XRD分析研究了不同稀土加入量对熔覆层显微组织和相结构的影响,用显微硬度计、滑动摩擦磨损试验机分别测试了复合涂层的硬度、耐磨性。结果表明:由于稀土的加入,复合涂层的晶粒进一步细化,组织趋向均匀,硬度和耐磨性得到了提高,最终得出涂层粉末的最佳配比为(质量分数)59%Ni60,40%WC,1.0%La2O3。
To WC ceramic nickel-based alloy powder added different mass fraction of La2O3 powder made of mixed powder, the use of high-power semiconductor laser by coaxial powder feeding method, the A3 steel substrate prepared cladding layer. The microstructure and phase structure of the coatings were investigated by SEM, EDAX and XRD. The hardness and wear resistance of the coatings were tested by micro-hardness tester and sliding friction tester respectively. The results show that due to the addition of rare earth, the grain size of the composite coating is further refined, the microstructure tends to be uniform, and the hardness and wear resistance are improved. Finally, the optimum proportion of coating powder is 59% Ni60 , 40% WC, 1.0% La2O3.