激光熔覆NiCr/Cr3C2-Ag-BaF2/CaF2金属基高温自润滑耐磨覆层的组织结构及摩擦学性能

俞友军<sup>1; 2</sup>; 周健松<sup>1</sup>; 陈建敏<sup>1</sup>; 周惠娣<sup>1</sup>; 郭  纯<sup>1; 2</sup>

引用本文:	俞友军，周健松，陈建敏，周惠娣，郭纯.激光熔覆NiCr/Cr3C2-Ag-BaF2/CaF2金属基高温自润滑耐磨覆层的组织结构及摩擦学性能[J].中国表面工程,2010,(3):64~69
	YU You–jun, ZHOU Jian–song, CHEN Jian–min, ZHOU Hui–di, GUO Chun.Microstructure and Tribological Behavior of Laser Cladding NiCr/Cr3C2-Ag-BaF2/CaF2 Self-lubrication Wear-resistant Metal Matrix Composite Coating[J].China Surface Engineering,2010,(3):64~69

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激光熔覆NiCr/Cr3C2-Ag-BaF2/CaF2金属基高温自润滑耐磨覆层的组织结构及摩擦学性能
俞友军，周健松，陈建敏，周惠娣，郭纯^1,2
1.中国科学院兰州化学物理研究所固体润滑国家重点试验室，兰州 730000;2.中国科学院研究生院，北京 100049

摘要:

利用激光熔覆技术在不锈钢表面制备了NiCr/Cr3C2-Ag-BaF2/CaF2金属基高温自润滑耐磨覆层,用X射线衍射仪分析了复合粉末及其激光熔覆耐磨覆层的物相组成,用扫描电子显微镜分析了耐磨覆层横截面的显微组织结构特征.在干滑动磨损试验条件下测试了覆层的耐磨性能,并用扫描电子显微镜观察和分析了覆层的摩擦磨损机理.试验结果表明,激光熔覆NiCr/Cr3C2-Ag-BaF2/CaF2金属基高温自润滑耐磨覆层,从室温到500 ℃试验温度范围内表现出了良好的减摩抗磨效果,并且随着温度的升高覆层材料表现出了不同的摩擦磨损机理,从室温到200 ℃温度范围主要表现为粘着磨损和磨粒磨损共同作用,温度超过200 ℃后主要表现为塑性变形和轻微的粘着磨损.

关键词: 激光熔覆金属基复合覆层自润滑摩擦磨损

DOI：

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基金项目:国家自然科学基金委创新研究群体科学基金(NNSFC, No. 50421502)；“西部之光”基金项目

Microstructure and Tribological Behavior of Laser Cladding NiCr/Cr3C2-Ag-BaF2/CaF2 Self-lubrication Wear-resistant Metal Matrix Composite Coating

YU You–jun, ZHOU Jian–song, CHEN Jian–min, ZHOU Hui–di, GUO Chun^1,2

1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000;2. Graduate School, Chinese Academy of Sciences, Beijing 100049

Abstract:

The self–lubrication wear–resistant NiCr/Cr3C2–Ag–BaF2/CaF2 metal matrix composite coating was fabricated on 1Cr18Ni9Ti stainless steel substrate by means of laser cladding. The phase compositions and cross-sectional microstructures of the coating were analyed by means of scanning electron microscopy and X–ray diffraction. The friction and wear behavior of the composite coating sliding against Si3N4 ceramic ball from ambient to 500 ℃ was evaluated using a ball–on–disc friction and wear tester, and the worn surface morphologies of the composite coating were observed using a scanning electron microscopy. It was found that the laser cladding NiCr/Cr3C2–Ag–BaF2/CaF2 metal matrix composite coating on the stainless steel substrate had good friction–reducing and antiwear abilities at elevated temperatures up to 500 ℃. The laser cladding composite coating was dominated by mixed adhesion and abrasive wear as it slid against the Si3N4 ceramic ball below 200 ℃. With further increase in the test temperature up to 500 ℃, it was characterized by mild adhesive wear and plastic deformation.

Key words: laser cladding metal matrix composite coating self–lubrication friction wear