SiC particle reinforced 0.2% nano SiC

p

/ZA-32.5 composites were prepared by powder injection of melt inside and stirring combined with ultrasonic treatment

and the dry friction behavior and wear performance of the as-cast composites with different ultrasonic powers were investigated.Meanwhile

the relationship between wear properties

worn surface morphology

wear temperature

Micro-vickers hardness of wear section status as well as microstructure were analyzed.The results reveal that ultrasonic treatment can not only disperse effectively the nano sized silicon carbide particles in the matrix alloy

but also refine the as-cast grain size.During the stabilization process of dry friction behaviors

the wear lose rate of the as-cast specimen is decreased with the increase of the ultrasonic power.At the same time

the wear temperature and hardness of wear section status are increased.Although micro vickers hardness of the contact surface and that of the sub-contact surface are increased

micro vickers hardness of the part far from the contact surface has the largest value.Micro vickers hardness of the contact surface is reduced by 14%during friction wear condition.The optimal wear rate of the casting composite is 0.45 mm/m treated by 800 Wultrasonic power

and ultrasonic treatment can improve significantly the wear resistance of zinc matrix composites reinforced by nano silicon carbide particles under high temperature conditions caused by friction.