Study on the High-Heat Tribological Characteristics of Lubricating Wear-Resisting Coating Prepared by Supersonic Plasma Spraying

Abstract:

This paper is about the study of the KF301/WS₂ composite lubrication wear-resisting coatings prepared by supersonic plasma spraying. Basing on the research of the tribological characteristics, it has been discussed the self-lubricity and the failure mechanism showed by composite lubrication coatings under high-temperature conditions. Research shows that the wear rate of the coatings increased 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. Temperature has great effect on the friction and wear properties of the self-lubricating wear-resisting coatings, mainly manifests in two aspects: first, with the increase of the temperature, under the common influence of thermal stress and frictional contact stress, it promotes the WS₂ solid lubricant film cracking, breakage, shedding process, and lubrication and abrasive resistance reduces; on the other hand, the WS₂ occurs chemical reaction under high temperature, generating lubricity phase of NiWO₄, CrS, and lubricity phases are well supplied, lubricating film has an effect of continuous lubrication on the rubbing surface, So the coating shows low-friction, and it also represents that the KF-301/ WS₂ self-lubricating composite coating has good lubrication and abrasive resistance under high temperature．

• Periodical: Applied Mechanics and Materials (Volumes 80-81)
• Pages: 661-666
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.80-81.661
• Online since: July 2011
• Authors: Yun Cai Zhao, Jia Jia Mao, Chun Ming Deng, Wem You Ma
• Keywords: Composite Lubrication Coating, Hig-Heat Tribological Characteristics, High-Heat Self-Lubricating Effect, Supersonic Plasma Spraving

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