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材料工程  2019, Vol. 47 Issue (3): 101-108    DOI: 10.11868/j.issn.1001-4381.2018.000849
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Ti6Al4V合金激光原位合成自润滑复合涂层高温摩擦学性能
周仲炎1, 庄宿国2, 杨霞辉2, 王勉1, 罗迎社1, 刘煜3, 刘秀波1,4
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. 西安航天动力研究所, 西安 710100;
3. 长沙学院 机电工程学院, 长沙 410022;
4. 河南科技大学 高端轴承摩擦学技术与应用国家地方联合工程实验室, 河南 洛阳 471003
High temperature tribological properties of laser in-situ synthesized self-lubricating composite coating on Ti6Al4V alloy
ZHOU Zhong-yan1, ZHUANG Su-guo2, YANG Xia-hui2, WANG Mian1, LUO Ying-she1, LIU Yu3, LIU Xiu-bo1,4
1. Hunan Province Key Laboratory of Materials Surface/Interface Science & Technology, Central South University of Forestry & Technology, Changsha 410004, China;
2. Xi'an Aerospace Propulsion Institute, Xi'an 710100, China;
3. College of Mechanical & Electrical Engineering, Changsha University, Changsha 410022, China;
4. National United Engineering Laboratory for Advanced Bearing Tribological Technology, Henan University of Science & Technology, Luoyang 471003, Henan, China
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摘要 为提高Ti6Al4V合金的高温摩擦学性能,采用激光熔覆技术在其表面原位合成多相混杂金属基高温自润滑耐磨复合涂层,熔覆粉末的成分为Ni60-16.8% TiC-23.2% WS2(质量分数,下同),系统地研究复合涂层的显微组织、物相结构及其在20,300,600,800℃下的摩擦学性能和相关磨损机理。结果表明:复合涂层的显微硬度(701.88HV0.5)约为基体(350 HV0.5)的2倍;由于原位合成固体润滑相(Ti2SC/TiS/NiS/TiO/TiO2/NiCr2O4/Cr2O3)和硬质相(W,Ti)C1-x/TiC/Cr7C3的协同作用,复合涂层的耐磨减摩性能明显优于基体。随着温度升高,涂层和基体的摩擦因数和磨损率均呈下降趋势,在800℃时复合涂层和基体的摩擦因数分别为0.32和0.43,磨损率分别为1.80×10-4,2.92×10-5mm/Nm。在800℃下塑性变形、分层和氧化磨损为基体主要磨损机理,复合涂层以氧化磨损和轻微的黏着磨损为主。
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周仲炎
庄宿国
杨霞辉
王勉
罗迎社
刘煜
刘秀波
关键词 激光熔覆Ti6Al4V合金高温耐磨复合涂层固体润滑原位合成    
Abstract:In order to improve the high temperature tribological properties of Ti6Al4V alloy, multi-phase hybrid metal matrix high-temperature self-lubricating anti-wear composite coating was in-situ synthesized by laser clad with the powder precursor of Ni60-16.8%TiC-23.2%WS2(mass fraction, the same below). The microstructure, phase composition and tribological properties as well as the corresponding wear mechanisms of the composite coating at 20, 300, 600, 800℃ were analyzed systematically. The results show that the microhardness of the composite coating (701.88HV0.5) is about two-fold of the substrate (350HV0.5). Due to the synergetic effect of the in-situ synthesized solid lubricants Ti2SC/TiS/NiS/TiO/TiO2/NiCr2O4/Cr2O3 and hard phases (W,Ti)C1-x/TiC/Cr7C3, both the wear resistant and friction reducing capabilities of the composite coating are better than that of the substrate. With the increase of temperature, the friction coefficient and wear rates of the composite coating and the substrate all exhibit decreasing trend, i.e., the friction coefficient of the composite coating and substrate are 0.32, 0.43 and wear rates are 1.80×10-4, 2.92×10-5mm/Nm at 800℃, respectively. The main wear mechanisms of substrate are mainly plastic deformation and delamination as well as oxidation wear, while the composite coating is predominated by the oxidation wear and slight adhesive wear at 800℃.
Key wordslaser cladding    Ti6Al4V alloy    high-temperature wear resistant composite coating    solid lubrication    in-situ synthesis
收稿日期: 2018-07-16      出版日期: 2019-03-12
中图分类号:  TG174.44  
通讯作者: 刘秀波(1968-),男,教授,博士,研究方向:表面工程与摩擦学,激光加工,联系地址:湖南省长沙市韶山南路498号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(410004),E-mail:liuxiubosz@163.com     E-mail: liuxiubosz@163.com
引用本文:   
周仲炎, 庄宿国, 杨霞辉, 王勉, 罗迎社, 刘煜, 刘秀波. Ti6Al4V合金激光原位合成自润滑复合涂层高温摩擦学性能[J]. 材料工程, 2019, 47(3): 101-108.
ZHOU Zhong-yan, ZHUANG Su-guo, YANG Xia-hui, WANG Mian, LUO Ying-she, LIU Yu, LIU Xiu-bo. High temperature tribological properties of laser in-situ synthesized self-lubricating composite coating on Ti6Al4V alloy. Journal of Materials Engineering, 2019, 47(3): 101-108.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000849      或      http://jme.biam.ac.cn/CN/Y2019/V47/I3/101
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