铝基制动盘的材料黏度影响因素分析

Effect Analysis on Apparent Viscosity of SiCp/A357 Composite Material Brake Disc

基于半固态技术为基础的SiCp/A357铝基复合材料制动盘制造方法,并对半固态的SiCp/A357复合材料的表观黏度及其影响因素进行了研究。分别制备了含有10%SiCp和20%SiCp的两种SiCp/A357复合材料,并与A357合金进行了对比研究。试验结果表明,半固态的A357合金和SiCp/A357复合材料的表观黏度均随半固态浆料中固相成分占比的增大而增大,随着剪切率的增大而降低,增加SiCp可以优化合金中的主要成分-Al,进而细化晶粒。基于研究成果,通过精确控制浆料黏度,可以获取SiC颗粒分布相对均匀的SiCp/A357铝基复合材料组织。

In this paper,based on the semi-solid technology in the brake disc forming method,the apparent viscosity and effect factors of SiCp/A357 composite material were researched.Compared with the A357 alloy,the 10% and 20%content of SiCp in SiCp/A357 composite material were made separately.The results show that,the apparent viscosity of semi-soli A357 alloy and SiCp/A357 composite material increase with ratio of the solid phase composition in the semi-solid slurry increases,but decrease with the increase of shear rate.Added of SiCp can optimize the main ingredient,α-Al,then refine the grain.Therefore,the SiCp/A357 composite material which SiC grain uniformly distributed throughout the microstructural can be get based on the research achievement.