DRY SLIDING FRICTION AND WEAR BEHAVIOR OF HYBRID COMPOSITE OF PURE Al REINFORCED WITH SiC and Gr PARTICLES

Dry friction and wear behavior of Al matrix composites including those hybridizedly reinforced with 20 vol%SiC and 9 vol%Gr particles, and those separately reinforced with 20 vol%SiC and 9 vol%Gr particles were investigated. The wear tests were performed using a pin on disk wear machine under dry sliding condition, at a speed of 0.6 m/s within a load of 10 N to 120 N. At low loads (<30 N), the friction coefficient and wear rate of hybrid composites were all lower than those of composites reinforced respectively with SiC P and Gr P, because of cooperation of load bearing of SiC P and self lubrication of Gr P. At higher loads (30~120 N), the wear rate of hybrid composite was higher than that of SiC P/Al because of surface delamination of hybrid composite, but was greatly lower than Gr P/Al. The friction coefficient of hybrid coompisite was less than that of SiC P/Al. The wear rate of counterface which mated with pin of hybrid composite was largely lower than that of SiC P/Al at all loads.