石墨对Cu-12Al-6Ni粉末合金组织和性能影响

Microstructure and mechanical properties of Cu-12Al-6Ni with graphite addition prepared by powder metallurgy

研究了石墨的添加对Cu-12Al-6Ni粉末合金组织和性能影响。结果表明:随着石墨含量增加,合金中的孔隙、Al_(4)Cu_(9)和NiAl相逐渐增多;合金的烧结密度、硬度和抗拉强度随着石墨的增加逐渐减小,而合金的摩擦因数和磨损量都先增大后减小,当石墨含量为0.5%时磨损达到最大,当石墨含量为1%时摩擦因数达到最大,当石墨添加2%时,磨损量比不添加石墨合金降低了约32%。

The effect of graphite on the microstructure and properties of Cu-12Al-6Ni alloy prepared by powder metallurgy was investigated. The results show that the number of pores, Al_(4)Cu_(9), and NiAl phases in the structure increases with increasing of the graphite content. The sintering density, hardness and tensile strength of the alloy decreases as the graphite content increases. The friction coefficient and wear loss of the alloy first increases and then decreases with the increasing of the graphite content. When the graphite content is 0.5%, the friction coefficient reaches a maximum, and when the graphite content is 1%, the wear loss maximizes. When the graphite content is 2%, the wear loss of alloy is approximately 32% lower than that of the alloy without graphite.