Preparation and high-temperature tribological properties of WS2 reinforced CoCrTi composites

doi:10.13251/j.issn.0254-6051.2021.12.015

Abstract

Abstract: CoCrTi-(2.5, 4.0, 6.0) WS₂ composites were prepared by hot pressing sintering technology, and the content of WS₂ was optimized. The tribological properties of the composites from room temperature to 1000 ℃ were studied by ball-disk high temperature friction tester. The microstructure and phase composition of the composites were analyzed by X-ray diffractometer and scanning electron microscope. The results show that the suitable addition of WS₂ significantly improves the hardness and tribological properties of the composites. The friction coefficient and wear rate of the three composites have roughly the same trend as follows. The friction coefficient decreases with the increase of temperature from room temperature to 400 ℃, while the wear rate changes in the opposite trend. The friction coefficient increases slightly with the increase of temperature from 400 ℃ to 1000 ℃, while the wear rate first decreases, then increases, and finally decreases with the increase of temperature, and the wear rate reaches the maximum value at 800 ℃. Under the given test conditions, the composites with WS₂ content of 4.0wt% has the best high-temperature tribological properties. The specimens show different degree of abrasive wear at low temperatures, while the wear mechanism at high temperatures is oxidative wear.

Key words: CoCrTi composites, WS₂, high temperature, wear

CLC Number:

TG174.44

Qian Yu, Cui Gongjun, Bian Canxing, Kou Ziming. Preparation and high-temperature tribological properties of WS₂ reinforced CoCrTi composites[J]. Heat Treatment of Metals, 2021, 46(12): 94-99.

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Preparation and high-temperature tribological properties of WS₂ reinforced CoCrTi composites

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