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Tribological Properties of Graphite-based Solid Lubricating Coatings for Ti-6Al-4V Alloy at 500~800oC |
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 |
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Cite this article:
WANG Wei, PENG Yiqing, DING Shijie, CHANG Wenjuan, GAO Yuan, WANG Kuaishe. Tribological Properties of Graphite-based Solid Lubricating Coatings for Ti-6Al-4V Alloy at 500~800oC. Chinese Journal of Materials Research, 2023, 37(6): 432-442.
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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.
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Received: 14 April 2022
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Fund: National Natural Science Foundation of China(51975450) |
Corresponding Authors:
WANG Wei, Tel: 13609264618, E-mail: gackmol@163.com
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