覆铜铁粉对铜铁基粉末冶金闸片材料性能的影响  

Effect of Copper Coated Iron Powder on Properties of Copper/iron-based Powder Metallurgy Brake Material

作　　者：李岩[1] 陈跃[1] 上官宝[1] 杜三明[1] 

机构地区：[1]河南科技大学河南省摩擦学重点实验室,河南洛阳471023

出　　处：《热加工工艺》2016年第6期91-93,97,共4页Hot Working Technology

基　　金：河南省重大攻关项目(122101210100);国家自然科学基金青年基金项目(51405134);河南科技厅省科技合作项目(112106000034)

摘　　要：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 materials were fabricated by adding conventional reduced iron powder and copper coated iron powder （Fe-25Cu）. Afterwards, the mechanical propertie of the above-mentioned brake materials were tested and the morphology of the microstmcture was observed by SEM. Moreover, the friction and wear behavior was investigated by MM1000- II wear tester. The results show that copper coated iron powder is mainly the fusion of outer Cu particles and matrix Cu powder, which can achieve the combination of similar single-substrate atoms during sintering, meanwhile, the formation of solid solution formed by Fe and Cr alloy elements is restrained. The wetting effects of Cr taking as surface active agent on the interface between copper and graphite improve. The porosity decreases, then, the strength of material matrix and mechanical properties of the brake material improve. The wear loss of brake material reduces. At last, the brake material with better fiiction and wear properties can be obtained.

关 键 词：粉末冶金 闸片材料 覆铜铁粉(Fe-25Cu) 摩擦磨损 

分 类 号：TG174[金属学及工艺—金属表面处理] TF125.9[金属学及工艺—金属学]