SCHEDULED MAINTENANCE
Tribological properties of TiAl matrix self-lubricating composites incorporated with tungsten disulfide and zinc oxide
Abstract
To better understand the temperature-adjusted action of tungsten disulfide (WS2) and zinc oxide (ZnO) in self-lubricating composites, dry sliding tribological properties of TiAl matrix self-lubricating composites (TMSC) containing WS2, ZnO and WS2–ZnO against Si3N4 counterface are comparatively investigated from 25 to 800 °C. Tribological results suggest that TMSC containing WS2–ZnO exhibit the lowest friction coefficients and wear rates than TMSC containing only WS2 or ZnO over the wide temperature range, confirming the self-adjusted action of WS2–ZnO as the temperature changes. Specifically, WS2 is beneficial to the improvements of tribological properties within 200 °C, WS2 and ZnWO4 for 400 °C, ZnWO4 and ZnO for 600 °C and ZnO for 800 °C.
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