<strong>Ti-6Al-4V</strong>合金表面石墨基粘结固体润滑涂层的高温摩擦学性能

doi:10.11901/1005.3093.2022.209

材料研究学报

2023, Vol. 37

Issue (6): 432-442 DOI: 10.11901/1005.3093.2022.209

研究论文

本期目录 | 过刊浏览

Ti-6Al-4V合金表面石墨基粘结固体润滑涂层的高温摩擦学性能

王伟(

), 彭怡晴, 丁士杰, 常文娟, 高原, 王快社

西安建筑科技大学冶金工程学院西安 710055

Tribological Properties of Graphite-based Solid Lubricating Coatings for Ti-6Al-4V Alloy at 500~800^oC

WANG Wei(

), PENG Yiqing, DING Shijie, CHANG Wenjuan, GAO Yuan, WANG Kuaishe

School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

引用本文:

王伟, 彭怡晴, 丁士杰, 常文娟, 高原, 王快社. Ti-6Al-4V合金表面石墨基粘结固体润滑涂层的高温摩擦学性能[J]. 材料研究学报, 2023, 37(6): 432-442.
Wei WANG, Yiqing PENG, Shijie DING, Wenjuan CHANG, Yuan GAO, Kuaishe WANG. Tribological Properties of Graphite-based Solid Lubricating Coatings for Ti-6Al-4V Alloy at 500~800^oC[J]. Chinese Journal of Materials Research, 2023, 37(6): 432-442.

全文: PDF(20082 KB) HTML

摘要:

使用石墨作为固体润滑剂、硅酸钠为粘结剂、二氧化硅为填料、去离子水为分散介质，用浆料法在Ti-6Al-4V钛合金表面制备石墨基粘结固体润滑涂层。用球盘式摩擦磨损试验机测试这种涂层在500~800℃的摩擦学性能，使用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)以及X射线光电子能谱仪(XPS)等手段分析其物相、显微组织结构、元素组成及其化学态，研究了这种涂层的润滑机理。结果表明：这种石墨基粘结固体润滑涂层在600~700℃的摩擦学性能优异，在660℃其摩擦系数(0.03)和磨损率(0.953×10^-4 mm³/(N·m))最低。涂层中的熔融硅酸钠与SiO₂的协同润滑作用降低了石墨的热损失，在摩擦界面上生成的易剪切的粘性成分减少了摩擦磨损；在摩擦过程中，石墨通过层间剪切和吸附气体产生了良好的润滑性能，SiO₂增强了涂层的承载能力和涂层与基体之间的粘结强度，使涂层的耐磨性能提高。

关键词 ：金属学, 石墨, 固体润滑涂层, 润滑性能, 磨损机制

Abstract：

Graphite-based solid lubricating coatings were prepared on Ti-6Al-4V substrate by the slurry method with graphite as solid lubricant, silica as filler, sodium silicate as binder and deionized water as dispersion medium. The tribological properties of the coatings were evaluated by a ball-on-disk friction and wear tester at 500~800℃. The microstructure, chemical composition, elements state and phase constituents of the coatings were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS), respectively. The lubrication mechanism of the coating was also investigated. The results show that the coatings have excellent adhesion, anti-friction and anti-wear properties at 600~700℃. The coatings present the lowest friction coefficient (0.03) and wear rate (0.953×10^-4 mm³/(N·m)) at 660℃. At the same time, the co-lubrication of molten sodium silicate and SiO₂ in the coating reduces the heat loss of graphite, and the shear viscous component generated on the friction interface reduces the friction and wear. In the process of friction, graphite produces good lubrication performance through interlaminar shear and adsorption gas, SiO₂ enhances the bearing capacity of the coating and the bond strength between the coating and the matrix, so that the wear resistance of the coating was improved.

Key words： metallography graphite solid lubricating coating lubricating properties wear mechanism

收稿日期: 2022-04-14

ZTFLH:

TH117

基金资助:国家自然科学基金(51975450)

通讯作者: 王伟，副教授，gackmol@163.com，研究方向为固体润滑涂层的制备及摩擦学性能

Corresponding author: WANG Wei, Tel: 13609264618, E-mail: gackmol@163.com

作者简介: 王伟，男，1985年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.209 或 https://www.cjmr.org/CN/Y2023/V37/I6/432

表1 Ti-6Al-4V合金的化学成分 (质量分数，%)

图1 石墨粘结固体润滑涂层在不同温度保温后的XRD图像、SEM照片和元素含量以及在700℃热处理后的SEM照片和元素含量

图2 石墨粘结固体润滑涂层的XPS谱

图3 石墨粘结固体润滑涂层的TG-DSC曲线

图4 涂层在不同温度下的摩擦系数、氮化硅球的磨损率和平均摩擦系数

图5 不同温度下涂层磨痕表面的SEM照片

图6 不同温度下氮化硅球磨斑的SEM照片和EDS图

表2 不同温度下氮化硅球磨损表面的元素含量 (质量分数，%)

图7 在660℃摩擦试验后涂层磨痕表面的元素分布

图8 涂层的Raman光谱和在660℃Ti-6Al-4V钛合金盘磨损表面的Raman光谱

图9 Ti-6Al-4V钛合金盘在660℃磨损表面的XPS谱

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