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采用添加常规还原铁粉和覆铜铁粉(Fe-25Cu)制备出铜铁基粉末冶金闸片材料,测试两种闸片材料的力学性能,并通过扫描电镜观测其微观组织形貌,在MM1000-Ⅱ摩擦磨损试验机上测试摩擦磨损性能。结果表明:在烧结过程中,覆铜铁粉主要是外层的Cu粒子与基体铜粉熔合,实现了类似单一基体原子的结合,同时,抑制了Fe与合金元素Cr形成固溶体。改善了Cr作为表面活性元素对铜和石墨界面的润湿作用,降低了孔隙率,提高了材料基体的强度以及闸片材料的力学性能,降低了闸片材料的磨损量,使材料获得更优异的摩擦磨损性能。
Copper-iron-based powder metallurgy brake pad material was prepared by adding conventional reduced iron powder and copper-coated iron powder (Fe-25Cu). The mechanical properties of the two kinds of brake pad materials were tested. The microstructure was observed by SEM. -Ⅱ friction and wear testing machine friction and wear properties. The results show that during the sintering process, the Cu particles of the outer layer of the copper-coated iron powder are fused with the matrix copper powder to achieve the bonding similar to that of a single substrate while inhibiting the formation of a solid solution of Fe with the alloying element Cr. Improves the wetting effect of Cr as a surface active element on the interface between copper and graphite, lowers the porosity, improves the strength of the material matrix and the mechanical properties of the brake pad material, reduces the wear amount of the brake pad material and makes the material get more excellent The friction and wear properties.