Tribological behavior of Ni3Al matrix self-lubricating composites containing WS2, Ag and hBN tested from room temperature to 800 °C

Abstract

Ni3Al matrix self-lubricating composites (NMSC) containing varied amounts of WS2, Ag and hBN (WAh) with weight ratio of 1:1:1 were fabricated by in situ technique using spark plasma sintering. The friction and wear properties of NMSC against the commercial Si3N4 ceramic ball at the load of 10N and sliding speed of 0.234m/s for 80min from room temperature to 800°C were investigated. The results showed that the tribological properties of NMSC strongly depended on the addition content of WAh. Moreover, NMSC with 15wt.%WAh and 5wt.% TiC exhibited the relatively lower friction coefficients and the less wear rates from RT to 800°C. The excellent tribological behavior of NMSC with 15wt.%WAh and 5wt.% TiC was attributed to the synergetic action of composite lubricants of WAh and reinforced phase of TiC.