Al-Si composites reinforced with single nano

single micro and hybrid nano-micro SiC particles were fabricated by vacuum hot pressing sintering.The friction and wear properties of the particles reinforced Al-Si composites were tested

and the wear mechanism was described.The results reveal that compared with that of the Al-Si matrix alloy

wear volume of the composites prepared was decreased greatly.At the amount of 3% SiC nano-particles

with increasing in the addition of SiC micro-particles

the wear volume of the composites is decreased firstly and then increased.The wear volume of the composites with（3%nm+15%μm）hybrid nano-micro SiC particles reinforced reaches minimum value

and wear resistance is improved by 58.2% compared with those of the Al-Si matrix alloy.The wear morphology of the nano-micro SiC particles reinforced composites was observed by SEM（scanning electron microscope）

and it is found that the wear mechanism is characterized mainly by abrasive wear.