Tribological Behavior of Graphite - Based Composite Coating Modified by Molybdenum Disulfide at High Temperature

QIU Zi - jian, TANG Hai - peng, ZHAO Yong - wu

doi:10.16577/j.issn.1001-1560.2022.0239

Materials Protection >

2022 , Vol. 55 >Issue 9: 10 - 15

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0239

Tribological Behavior of Graphite - Based Composite Coating Modified by Molybdenum Disulfide at High Temperature

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(1.Wuxi Mechanical and Electrical Branch，Jiangsu Union Technical Institute，Wuxi 214028，China;2. School of Mechanical Engineering, Jiangnan University, Wuxi 214122, China)

Received date: 2022-03-30

Revised date: 2022-04-19

Accepted date: 2022-05-16

Online published: 2023-12-23

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Abstract

At present, there are few researches on the tribological behavior of the coatings on piston skirt at high temperature. In this paper, a wear - resistant and friction - reducing composite coating for use in piston service environment was prepared using graphite and molybdenum disulfide as fillers and polyimide (PI) as binder, and the tribological behavior of coatings with different components at 200 ℃ and 400 ℃ was studied. Moreover, the thermal stability of the coatings was characterized by a thermogravimetric analyzer (TGA), and the friction and wear properties of the coatings were characterized by a friction and wear tester and a scanning electron microscope (SEM). Results showed that the graphite/PI coating had better high - temperature resistance. At 200 ℃, the molybdenum disulfide/graphite/PI coating had the lowest friction coefficient, which was 0.175; at 400 ℃, the friction coefficient of coatings both increased, however owing to the decomposing of molybdenum disulfide, the friction coefficient of graphite/PI coating was lower than that of molybdenum disulfide/graphite/PI coating. Besides, the wear rate had the same change trend with the friction coefficient. The molybdenum disulfide/graphite/PI coating showed the lowest wear rate at 200℃, while the graphite/PI coating possessed lower wear rate than the molybdenum disulfide/graphite/PI coating at 400 ℃.

Key words： graphite; molybdenum disulfide; high temperature; friction coefficient; wear rate

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QIU Zi - jian, TANG Hai - peng, ZHAO Yong - wu . Tribological Behavior of Graphite - Based Composite Coating Modified by Molybdenum Disulfide at High Temperature[J]. Materials Protection, 2022 , 55(9) : 10 -15 . DOI: 10.16577/j.issn.1001-1560.2022.0239

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