Thermal Stress Analysis of Lubricating Wear-Resisting Coating Prepared by Supersonic Plasma Spraying in the High-Heat Tribological Process

Abstract:

This paper is about the study of the KF301/WS₂ composite lubricating wear-resisting coatings prepared by supersonic plasma spraying. Basing on the research of the tribological characteristics, it has been discussed that the thermal stress of lubricating wear-resisting coating prepared by supersonic plasma spraying in the high-heat tribological process. Research shows that the wear rate of the coating increases with the increase of the temperature. At 300°C, the wear rate is 1.02×10^-4mg/m; At 750°C, the wear rate is 2.61×10^-4 mg/m. With the increase of temperature, friction coefficient of the coatings shows gradually increasing. When the temperature falls below 600°C, friction coefficient keeps around 0.08; At 750°C, the friction coefficient is 0.12. The thermal stress σ_1max mainly is controlled by temperature, with the increase of temperature, the warping phenomena of solid lubricant film and the combined effects of heat stress and friction contact stress, which causes the insecure combination of the lubricant film and substrate, lubricant film’s warp, break, local direct contact between the metals, which is one of reasons to lead to decrease of the tribological properties of self-lubricating composite coating.

• Periodical: Applied Mechanics and Materials (Volumes 80-81)
• Pages: 667-672
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.80-81.667
• Online since: July 2011
• Authors: Yun Cai Zhao, Gao Jie Hao, Chun Ming Deng, Wem You Ma
• Keywords: Composite Lubrication Coating, Hig-Heat Tribological Characteristics, Supersonic Plasma Spraving, Thermal Stress

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