超音速等离子喷涂Al-35Si-4Fe涂层制备工艺优化及摩擦学性能  

Preparation Process Optimization and Tribological Properties of Al-35Si-4Fe Coating Prepared By Supersonic Plasma Spraying

作　　者：顾宗强 雷秋骏 姚春欢 徐逸铭 徐浩博 GU Zongqiang;LEI Qiujun;YAO Chunhuan;XU Yiming;XU Haobo(Guangzhou Locomotive Depot,China Railway Guangzhou Group Co.,Ltd.,Guangzhou 510499,China;Hangzhou Rolling Stock Depot,China Railway Shanghai Group Co.,Ltd.,Hangzhou 310000,China;CRRC Qishuyan Co.,Ltd.,Changzhou 213011,Jiangsu,China;Houston International College,Dalian Maritime University,Dalian 116085,Liaoning,China;CITIC Heavy Industry Machinery Co.,Ltd.,Luoyang 471600,Henan,China)

机构地区：[1]中国铁路广州局集团有限公司广州机务段,广州510499 [2]中国铁路上海局集团有限公司杭州机辆段,杭州310000 [3]中车戚墅堰机车有限公司,江苏常州213011 [4]大连海事大学休斯敦国际学院,辽宁大连116085 [5]中信重工机械股份有限公司,河南洛阳471600

出　　处：《热喷涂技术》2024年第1期80-85,共6页Thermal Spray Technology

摘　　要：为改善铝硅合金的摩擦学性能,以YL113铝硅合金为基体,喷涂功率、总气流量和喷涂距离为试验因素,显微硬度和孔隙率为考核指标,采用三因素三水平的正交试验法得到了超音速等离子喷涂Al-35Si-4Fe涂层的最佳制备工艺;研究了此工艺下涂层的摩擦学性能。结果表明:在喷涂功率65 kW,总气流量110 L min,喷涂距离95 mm时,涂层质量最佳,Al-35Si-4Fe涂层的显微硬度达到(465±24.4)HV_(0.2),涂层孔隙率为1.3%。试验条件下,Al-35Si-4Fe涂层的磨损机制以疲劳磨损为主,磨粒磨损为辅。Al-35Si-4Fe涂层的磨损率为1.88×10^(-4) mm^(3)(N·m),摩擦因数为0.37。优化后的Al-35Si-4Fe涂层能有效保护内部YL113铝硅合金,延长其使用寿命,并应对更加复杂的工况。In order to improve the tribological properties of Al-Si alloy,the optimum preparation process of supersonic plasma spraying Al-35Si-4Fe coating was obtained adopting three factor and three level orthogonal experimental method by using YL113 Al-Si alloy as the substrate,with spraying power,total gas flow rate,and spraying distance as experimental factors,microhardness and porosity as assessment indicators.The tribological properties of the coating under this process were studied.The results show that the coating quality is best when the spraying power is 65 kW,the total air flow rate is 110 L min,and the spraying distance is 95 mm,the microhardness of the Al-35Si-4Fe coating reaches(465±24.4)HV_(0.2),and the porosity of the coating is 1.3%.Under experimental conditions,the wear mechanism of Al-35Si-4Fe coating is mainly fatigue wear,supplemented by abrasive wear.The wear rate of Al-35Si-4Fe coating is 1.88×10^(-4) mm^(3)(N·m),and the friction coefficient is 0.37.The optimized Al-35Si-4Fe coating can effectively protect the internal YL113 Al-Si alloy,extend its service life,and cope with more complex working conditions.

关 键 词：超音速等离子喷涂 正交试验 铝硅涂层 摩擦学性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]