钛合金表面激光熔覆Ti-Ni+TiN+MoS<sub>2</sub>/TiS自润滑复合涂层

doi:10.11901/1005.3093.2018.163

材料研究学报

2018, Vol. 32

Issue (12): 921-928 DOI: 10.11901/1005.3093.2018.163

研究论文

本期目录 | 过刊浏览

钛合金表面激光熔覆Ti-Ni+TiN+MoS₂/TiS自润滑复合涂层

高秋实^1,², 闫华^1,²(

), 秦阳^1,², 张培磊^1,², 陈正飞^1,², 郭加龙^1,², 于治水^1,²

1 上海工程技术大学材料工程学院上海 201620
2 上海市激光先进制造技术协同创新中心上海 201620

Self-lubricating Wear Resistant Composite Coating Ti-Ni+TiN+MoS₂/TiS Prepared on Ti-6Al-4V Alloy by Laser Cladding

Qiushi GAO^1,², Hua YAN^1,²(

), Yang QIN^1,², Peilei ZHANG^1,², Zhengfei CHEN^1,², Jialong GUO^1,², Zhishui YU^1,²

1 Shanghai University of Engineering Science, College of Materials Engineering, Shanghai 201620, China
2 Shanghai Collaboratme Innovation Center of Laser Advanced Manufacturing Technology, Shanghai 201620, China

引用本文:

高秋实, 闫华, 秦阳, 张培磊, 陈正飞, 郭加龙, 于治水. 钛合金表面激光熔覆Ti-Ni+TiN+MoS₂/TiS自润滑复合涂层[J]. 材料研究学报, 2018, 32(12): 921-928.
Qiushi GAO, Hua YAN, Yang QIN, Peilei ZHANG, Zhengfei CHEN, Jialong GUO, Zhishui YU. Self-lubricating Wear Resistant Composite Coating Ti-Ni+TiN+MoS₂/TiS Prepared on Ti-6Al-4V Alloy by Laser Cladding[J]. Chinese Journal of Materials Research, 2018, 32(12): 921-928.

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摘要:

以NiCrBSi、TiN和Ni包MoS₂为熔覆材料,采用激光熔覆技术在Ti-6Al-4V合金表面制备了以TiN、TiMo和Ti-Ni金属间化合物为增强相,以MoS₂、TiS为润滑相的自润滑复合涂层。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、显微硬度仪和多功能摩擦磨损实验机等手段分析涂层的物相、显微组织结构、显微硬度和摩擦学性能,研究了复合涂层的磨损机理。结果表明：复合涂层的平均显微硬度为1060~1140HV_0.3,约为基体硬度(约为370HV_0.3)的3倍。由于涂层中硬质增强相TiN、TiMo、Ti-Ni和润滑相MoS₂、TiS的综合作用,TiN含量为25%的复合涂层其摩擦系数(0.3199)和磨损量(2.2 mg)均比基体的(0.3535和11.8 mg)低,具有良好的自润滑耐磨性能。

关键词 ：材料表面与界面, 激光熔覆, 复合涂层, 钛合金, 自润滑耐磨性

Abstract：

A self-lubricating composite coating of Ti-Ni+TiN+MoS₂/TiS with TiN, TiMo and Ti₂Ni as reinforcement phases, while MoS₂ and TiS as lubricant phases, was fabricated on Ti-6Al-4V alloy by laser cladding with composite alloy powder of NiCrBSi, TiN and Ni-coated MoS₂ as cladding materials. The phase compositions, microstructure, microhardness and tribological properties of the coating were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), microhardness tester and multi-purpose friction and wear testing machine,respectively. Results show that the mean microhardness of the composite coating (between 1060 and 1140HV_0.3) is about 3 times higher than that of the substrate (370HV_0.3). Due to the combined effect of hard reinforcing phases TiN, TiMo, and Ti-Ni, as well as lubricating phases MoS₂ and TiS, the friction coefficient (0.3199) and the wear mass loss (2.2 mg) of the composite coating are both lower than those of the substrate (0.3535 and 11.8 mg). Therefore, the prepared composite coating has good self-lubricating wear resistance.

Key words： surface and interface in the materials laser cladding composite coatings titanium alloy self-lubricating wear resistance

收稿日期: 2018-02-09

基金资助:国家自然科学基金(51405288, 51605276),上海市科技创新行动计划 (17JC1400600, 17JC1400601),上海工程技术大学研究生创新项目(17KY0503)

作者简介:

作者简介高秋实,男,1993年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.163 或 https://www.cjmr.org/CN/Y2018/V32/I12/921

表1 基体Ti-6Al-4V化学成分(质量分数,%)

表2 NiCrBSi粉末化学成分(质量分数,%)

表3 预涂混合粉末的组成(质量分数,%)

图1 复合涂层的截面和结合区的SEM图片

图2 复合涂层的X射线衍射图谱

图3 复合涂层的SEM照片

图4 复合涂层的SEM照片和EDS分析结果

图5 复合涂层的显微硬度分布

图6 复合涂层的室温磨擦系数

图7 复合涂层和基体的磨损量

图8 复合涂层和基体磨损的形貌SEM照片

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