SiC颗粒增强铝基复合材料制动盘的研究

RESEARCH ON AUTOMOTIVE BRAKE DISCS OF SiC_P/Al COMPOSITE

采用半固态搅拌熔炼 -液态模锻工艺制备了与 Santana轿车前制动器相匹配的 Si C颗粒增强铝基复合材料制动盘 ,对该制动盘进行了材料拉伸性能和微观结构分析 ,并在 SCHENCK制动试验台上进行了制动性能和制动磨损试验。结果表明 ,复合材料的拉伸性能优于传统制动盘材料 HT2 5 0铸铁 ;在各种制动工况条件下 ,复合材料制动盘对制动衬片的摩擦系数均在大众公司企业标准规定的范围之内 ,且较稳定 ;此外 ,复合材料制动盘质轻、耐磨 ,制动噪音小、温升低 ,运转平稳 ;因此 ,可望以其替代传统的铸铁制动盘 ,提高制动器的安全可靠性和服役寿命 ,减轻轿车悬挂系统的重量 。

The SiCp/Al composite brake disc designed for the front brake of SANTANA cars was prepared by semisolid stirring melting and liquid forging. The tensile properties and microstructure of the disc materials was examined, and the tribological-wear performances of the disc were tested on the SCHENCK brake testing system made in Germany. The results show that the tensile properties of the composites are superior to that of cast iron which can be conventionally, used as brake disc material. Under different braking conditions, the friction coefficient of the composite brake disc against the conventional brake pad is within the range specified by the standard of VOLKSWAGEN company. It was proved that the composite brake disc has such advantages as light weight, high wear resistance, low braking noise, low braking temperature rise and smooth operation. It is hopeful to substitute the composite brake disc for the cast iron brake disc to improve reliability , prolong the service life of car brake, reduce the weight of suspension system and decrease fuel consumption.