SiC对Al基复合摩擦材料性能的影响

Effect of SiC on the Property of Modified Al-based Composite Friction Materials

采用粉末冶金方法制备填充改性Al基复合摩擦材料,研究SiC含量及粒度对材料性能及显微组织的影响。结果表明,随SiC含量增加,材料的相对密度、抗弯强度不断降低,摩擦因数逐渐增大,洛氏硬度先增大后减小,比磨损率先降低后增大;随SiC粒度增大,材料相对密度、抗弯强度、洛氏硬度逐渐变大,摩擦因数先增大后减少,比磨损率不断增加。SiC粒度为20μm、质量分数为25%时改性Al基复合摩擦材料有稳定合适的摩擦因数和较低的比磨损率。

The Al-based composite friction materials were prepared by powder metallurgy, and the effects of the content and particle size of SiC on the on the properties of composite friction materials were studied. The results show that along with increasing of the of SiC content, the relative density and the bending strength of the composite friction materials are decreased continuously, the friction coefficient is increased gradually, the Rockwell hardness is increased at first and then decreased, and the specific wear rate is decreased at first and then increased. With the increase of SiC particle size, the relative density, bending strength and Rockwell hardness are increased gradually, the friction coefficient is increased at first and then decreased, and the specific wear rate is increased continuously. The Al-based composite friction material has stable and moderate friction coefficient and extremely low wear rate when modified by 25% of SiC mass fraction with particle size of 20 um.