Abstract

The influence of graphite content (volume fraction, 0, 3, 6, 9, 12%) on the microstructure, mechanical properties, thermal physical properties, and wear properties of silicon carbide particle–reinforced aluminum matrix (SiCp/Al) composites prepared by a powder metallurgy method for brake discs was investigated. The results show that its mechanical properties were deteriorated by the addition of graphite particle (Grp), whereas its thermal physical and wear properties got improved with increasing of graphite. The fracture mechanism of Grp-SiCp/Al composites comprises ductile fracture of matrix alloy and brittle fracture of SiCp and Grp. The addition of Grp reduces the wear volume, coefficient of friction, and fluctuation of the coefficient of friction of the composites. The wear mechanism of the composites is a single abrasive wear mechanism due to the addition of Grp. With a Grp content of 6 vol%, this SiCp/Al composite possesses optimal comprehensive properties, and it is confirmed by finite element simulation that this formula is suitable for brake disc materials.

摘要

石墨含量(体积分数, 0, 3, 6, 9, 12%)对碳化硅颗粒增强铝基(SiCp/Al)复合材料微观结构、力学性能、热物理性能和磨损性能的影响研究了一种用于制动盘的粉末冶金方法。结果表明,石墨颗粒(Grp)的加入降低了其力学性能,而随着石墨含量的增加,其热物理性能和磨损性能得到改善。Grp-SiCp/Al复合材料的断裂机制包括基体合金的韧性断裂和SiCp和Grp的脆性断裂。Grp的加入降低了复合材料的磨损量、摩擦系数和摩擦系数的波动。由于Grp的加入，复合材料的磨损机制为单一磨粒磨损机制。Grp 含量为 6 vol% 时，该 SiCp/Al 复合材料具有最佳的综合性能，有限元仿真证实该公式适用于制动盘材料。