Tribological properties of TiAl matrix self-lubricating composites incorporated with tungsten disulfide and zinc oxide

摘要

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 degrees 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 degrees C, WS2 and ZnWO4 for 400 degrees C, ZnWO4 and ZnO for 600 degrees C and ZnO for 800 degrees C.