摘要
应用粉末冶金技术制备了烧结Fe-C-MoS2/CuSn合金基减摩复合材料,对其组织结构和机械物理性能进行了研究.结果表明以CuSn合金为基体保证了材料的导电性.CuSn合金的强度大于混合同种金属元素烧结材料的强度.CuSn合金与Fe润湿性好,促进了烧结合金化,因而大幅度提高了材料的强度、硬度、冲击韧性.C以游离状态存在于基体中,其膨胀系数大于基体材料,起到了减摩作用.MoS2均匀分布在基体中,明显地起到了高温减摩作用.其中当Fe(质量分数)增加到15%时,冲击韧性达20.6 J/cm2,抗拉伸强度为163.2 MPa,布氏硬度为53.8,达到和超过了TB/T1842.1-2002电力机车粉末冶金滑板铁道行业标准,为高速列车受电弓滑板提供了新的材料.
The Fe-C-MoS2/CuSn alloy-based antifriction composites were prepared through powder metallurgy, of which the microstructure and mechanical properties were studied. The results showed that the CuSn alloy provides good electric conductivity for the composites, and its strength is higher than that of the sintered materials of the same alloying elements. The wettabilitiesof CuSn alloy and Fe are so high that accelerate the alloying process of sintering so as to improve greatly the strength, hardness and notch toughness. The thermal expansion coefficient of free carbon distributed in matrix is higher than that of the matrix itself and plays a role of antifriction in the composites. Meanwhile, the MoS2 homogenously distributed in matrix also plays evidently the role.of antifriction at high temperature. If the mass fraction of Fe is up to 15%, the toughness is 20.6J/cm^2, tensile strength 163.2 MPa and HB hardness 53.8, i. e., properties of this composites have been up to even exceeded the standard TB/T1842.1 - 2002 for the sildes made via powder metallurgy for electric locomotives. The composites thus become a new material for the pantograph sildes of high-speed locomotives.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第12期1157-1160,共4页
Journal of Northeastern University(Natural Science)
基金
国家高技术研究发展计划项目(2003AA305620)
关键词
CuSn合金
烧结
高温减摩
受电弓滑板
CuSn alloy
sintering
high-temperature antifriction
pantograph slide
