La2O3对激光熔覆镍基碳化钛复合涂层组织和耐腐蚀性能的影响
Effect of La2O3 on Microstructure and Corrosion Resistance of Ni/TiC Composite Coating Prepared by Laser Cladding
匡建新1, 汪新衡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 421000)
中文关键字：La2O3； 激光熔覆； 显微组织； 裂纹； 耐腐蚀性
英文关键字：La2O3; laser cladding; microstructure; crack; corrosion resistance
中文摘要：在45钢基材表面进行加入Ni60+30wt%镍包碳化钛合金粉末的激光熔覆，研究了La2O3含量和激光功率对激光熔覆层的显微组织、裂纹情况及耐腐蚀性能的影响。结果表明：适量La2O3的加入能使镍基碳化钛金属陶瓷熔覆层组织细化，裂纹大为减少甚至消失，宏观质量得到明显改善。添加适量La2O3的激光熔覆层的耐腐蚀能力比不含La2O3的激光熔覆层要高。
英文摘要：Ni60+Ni/TiC composite coating on 45 steel surface was prepared by laser cladding technology. The effects of La2O3 content and laser power on the microstructure, crack and corrosion resistance were studied. The results show that the microstructure of laser cladding coating is greatly refined and the crack is obviously reduced or even vanished by adding La2O3. The corrosion resistance of the coating with La2O3 is better than that without La2O3.