烧结压力对铜基粉末冶金闸片材料摩擦学性能的影响

Influence of Sintering Pressure on Tribological Property of Cu-Based Powder Metallurgy Material for Brake

在不同烧结压力下制备了铜基粉末冶金闸片材料,研究了烧结压力对其孔隙率和硬度的影响;采用高速摩擦磨损试验机,选择15CrMo钢作为配副材料,研究了铜基粉末冶金闸片材料的摩擦学特性,并用扫描电镜观察分析了材料显微组织及磨损表面形貌。结果表明:随着烧结压力从0 MPa增大到1.25 MPa,试验材料的孔隙率降低而硬度得到提高,摩擦因数和磨损率都同步减小;再继续增大烧结压力对孔隙率和摩擦磨损性能的影响不大。

Cu-based powder metallurgy material for brake was prepared at different sintering pressures. The influences of sintering pressure on the porosity and hardness of the material were studied. The tribological behavior of brake material against 15CrMo steel was investigated using high speed friction and wear testing machine. The microstructure and worn surface of the material were observed by scanning electron microscopy( SEM). Results indicate that when the sintering pressure increased from 0 MPa to 1. 25 MPa,the porosity of the sample reduced,but hardness increased; and the friction coefficient and wear rate all reduced. Increasing sintering pressure had no evident effect on the porosity and tribological properties when sintering pressure was above 1. 25 MPa.