SiC 和Gr 颗粒混杂增强Al 基复合材料的摩擦磨损特性的研究

比较了SiC 和Gr 颗粒混杂增强Al 基复合材料的干摩擦磨损行为, 并与单一SiC_P 和单一G_rP 增强Al 基复合材料的相应行为进行了比较。结果表明, 在低载荷(< 30 N ) 时, SiC_P 和G_rP 能协调作用, 使混杂复合材料的摩擦系数和磨损率均比单一SiC_P 和G_rP 增强复合材料低。在较高载荷(30～ 120 N ) 时, 混杂复合材料磨损以剥层磨损机制为主, 摩擦系数比单一SiC_P 增强复合材料低, 磨损率比单一G_rP 增强复合材料低得多, 比单一SiC_P 增强复合材料高。混杂复合材料对偶件的磨损比单一SiC_P 增强复合材料低得多。

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.