注射成形Cu-Fe-C摩擦材料的性能

Property of Cu-Fe-C Friction Materials Formed by Injection Molding

采用注射成形工艺制备了Cu-Fe-C坯料,通过溶剂脱脂和热脱脂、烧结制备出Cu-Fe-C摩擦材料。研究了Cu-Fe-C摩擦材料的力学性能及摩擦磨损性能,重点分析了Fe含量对Cu-Fe-C摩擦材料性能的影响。实验结果表明:材料中铜颗粒之间存在的孔隙及石墨为主要的裂纹源和扩展途径,使材料发生脆性断裂;高硬度、耐磨的Fe颗粒分布于铜基体中,可以提高材料的硬度、强度;当Fe含量达到8%时,材料的硬度为58HV,抗拉强度为148MPa;当摩擦速度为100～400r/min时,Fe颗粒的加入提高了材料磨损量、摩擦系数,降低了材料的磨损性能;高速摩擦条件下,Fe的加入促进摩擦表面氧化膜的形成,提高了材料的耐磨性能。

Cu-Fe-C preform was processed by injection molding, and Cu-Fe-C friction materials were prepared by solvent degreasing, thermal degreasing and sintering. Mechanical property and friction and wear perfromances of the Cu-Fe-C friction materials were researched. Effect of Fe content on the performance of Cu- Fe-C friction materials was emphasized. It shows that gap and graphite between copper particles are the main sources of the crack and the path of crack extension, thus making the brittle fracture of the materials occur. Fe particles with high hardness and wear resistance distributed in copper matrix may improve the hardness and strength of the materials. When Fe content is 8, the hardness of the materials is 58HV, and the tensile strength is 148Mpa. When friction velocity is 100-400r/min, the addition of Fe particles improves wear and friction coefficient, and reduces wear resistance of the materials. Under the condition of high speed friction, the addition of Fe element promotes the formation of oxidation film on friction surface, which improves the wear resistance of the materials.