SiC/Al composite powder was prepared by high energy ball milling

and effects of milling time

process control agent（PCA）

the weight ratio of ball to powder as well as quantity ratio of SiC to Al on the granularity of composite powder and the cladding effects of Al on SiC were investigated.The results show that the average granularity size of composite powder is closely related to the PCA

the quantity ratio of SiC to Al

ball milling time

and the weight ratio of ball to powder

and influencing order is as follows:PCA>quantity ratio of SiC to Al >ball milling time>weight ratio of ball to powder.The average size of powders are decreased dramatically with the increase of ball milling time

PCA and the weight ratio of ball to powder

and it exhibits firstly increased and then decreased with increasing in quantity ratio of SiC to Al

reaching the minimum value as the quantity ratio of SiC to Al of 3 to 7.The composite powder with fine particle size and desirable cladding effects can be successfully prepared with 1.5% PCA

weight ratio of ball to powder of 12:1 and quantity ratio of SiC to Al of 3:7 and milling for 9 hours.