304不锈钢表面激光制备Ti3SiC2-Ni基自润滑复合涂层的高温摩擦学性能  

High-temperature Tribological Properties of Ti3SiC2-Ni Based Self-lubricating Composite Coatings Prepared on 304 Stainless Steel by Laser Cladding

作　　者：欧阳春生 刘秀波 罗迎社[3] 梁珏 孟元 王跃明 OUYANG Chun-sheng;LIU Xiu-bo;LUO Ying-she;LIANG Jue;MENG Yuan;WANG Yue-ming(Hunan Province Key Laboratory of Materials Surface/Interface Science&Technology,Central South University of Forestry&Technology,Changsha 410004,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Hunan Institute of Traffic Engineering,Hengyang 421000,China;Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]中南林业科技大学材料表界面科学与技术湖南省重点实验室,长沙410004 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000 [3]湖南交通工程学院,湖南衡阳421000 [4]湖南科技大学,湖南湘潭411201

出　　处：《表面技术》2020年第8期161-171,共11页Surface Technology

基　　金：国家自然科学基金(U1737112);中国科学院兰州化学物理研究所固体润滑国家重点实验开放基金(LSL-1802);长沙市科技计划项目(kq1901134)。

摘　　要：目的提高304不锈钢减摩耐磨性能。方法使用LDM-8060型半导体激光加工系统,制备出三种不同配比的Ti3SiC2-Ni基自润滑耐磨复合涂层。使用X射线衍射仪(XRD)、扫描电镜(SEM)及其自带的能谱仪(EDS)对304不锈钢与Ti3SiC2-Ni基涂层进行表征,并系统地分析其在室温和600℃下的摩擦学性能和磨损机理。结果复合涂层主要由Cr0.19Fe0.7Ni0.11固溶体,硬质相Fe2C、Cr7C3和TiC,润滑相Ti3SiC2组成。其平均显微硬度分别为451.14、419.33、359.92HV0.5,明显高于304不锈钢基体的平均显微硬度(238.91HV0.5)。室温下,Ti3SiC2-Ni基复合涂层摩擦系数的平均值分别为0.41,0.46和0.48,磨损率分别为6.37×10^−5、16.52×10^−5、4.16×10^−5 mm^3/(N·m),均低于304不锈钢(0.56、46.35×10^−5 mm^3/(N·m))。在600℃下,Ti3SiC2-Ni基复合涂层的平均摩擦系数分别为0.38,0.43和0.41,磨损率分别为12.51×10^−5、7.58×10^−5、7.79×10^−5 mm^3/(N·m),也均低于304不锈钢(0.66,24.25×10^−5 mm^3/(N·m))。结论在室温和600℃下,Ti3SiC2-Ni基复合涂层能有效地提高304不锈钢的显微硬度,进而提升其摩擦学性能。其中添加10%Ti3SiC2的Ti3SiC2-Ni基复合涂层在600℃下表现出最好的耐磨性,而添加5%Ti3SiC2的Ti3SiC2-Ni基复合涂层在室温和600℃下表现出最好的减摩性能。The work aims to improve the wear resistance and friction reduction performance of the 304 stainless steel.The Ti3SiC2-Ni based self-lubricating wear-resistant composite coatings with three different ratios were prepared by LDM-8060 semiconductor laser processing system.XRD,SEM and built-in EDS were adopted to characterize 304 stainless steel and Ti3SiC2-Ni based coatings,and their tribological properties and wear mechanisms at room temperature and 600℃were analyzed systematically.The composite coatings were mainly composed of Cr0.19Fe0.7Ni0.11 solid solution,hard phase Fe2C,Cr7C3 and TiC as well as lubricating phase Ti3SiC2.The average microhardness of the coatings was 451.14,419.33 and 359.92HV0.5 respectively,significantly higher than those of 304 stainless steel(238.91HV0.5).At room temperature(RT),the average coefficient of friction(ACOF)of Ti3SiC2-Ni based composite coatings was 0.41,0.46 and 0.48,respectively,wear rate was 6.37×10^−5,16.52×10^−5 and 4.16×10^−5 mm^3/(N·m),respectively,which were lower than those of 304 stainless steel(0.56,46.35×10^−5 mm^3/(N·m)).At 600℃,the ACOF of the Ti3SiC2-Ni based composite coatings was 0.38,0.43 and 0.41,respectively,wear rate was 12.51×10^−5,7.58×10^−5 and 7.79×10^−5 mm^3/(N·m),respectively,which were also lower than those of 304 stainless steel(0.66,24.25×10^−5 mm^3/(N·m)).At room temperature and 600℃,Ti3SiC2-Ni based composite coatings can effectively improve the micro-hardness of 304 stainless steel,and then improve the tribological properties.The Ti3SiC2-Ni based composite coating with 10%Ti3SiC2 shows the best wear resistance at 600℃,while the Ti3SiC2-Ni based composite coating with 5%Ti3SiC2 shows the best friction reduction performance at RT and 600℃.

关 键 词：304不锈钢 激光熔覆 TI3SIC2 自润滑 耐磨复合涂层 高温摩擦性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]