Preparation and high-temperature tribological properties of self-lubricating CoCrW matrix composites reinforced by SrSO4

doi:10.13251/j.issn.0254-6051.2024.04.004

Abstract

Abstract: Self-lubricating CoCrW matrix composites reinforced by SrSO₄ (4.0%, 9.0% and 14.0%, respectively) were prepared to enhance the wear resistance of sleeve or bearing at high temperature, and the effect of SrSO₄ on the microstructure and high-temperature tribological properties of composites was systematically investigated. The results show that the SrSO₄ decomposes and the Cr₂O₃, Cr₂S₃, CoCr₂O₄ and SrCrO₄ phases are in-situ synthesized during sintering. A lubricating film containing in-situ synthesized solid lubricants and oxides as well as the tribochemistry reaction products is formed on the worn surfaces, improving the high-temperature lubricating properties of CoCrW matrix composites. As a result, the CoCrW matrix composite with 9.0%SrSO₄ has the desired tribological properties.

Key words: composites, high temperature, self-lubricating, wear

CLC Number:

TH117

Guo He, Cui Gongjun, Han Wenpeng, Liu Yanping, Kou Ziming. Preparation and high-temperature tribological properties of self-lubricating CoCrW matrix composites reinforced by SrSO₄[J]. Heat Treatment of Metals, 2024, 49(4): 18-25.

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Preparation and high-temperature tribological properties of self-lubricating CoCrW matrix composites reinforced by SrSO₄

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