新型铜基受电弓滑板材料的制备与性能

以弥散强化铜为基体, 镀铜石墨为润滑组元, 采用真空加压烧结方法成功制备了新型石墨/铜受电弓滑板材料。研究了烧结温度对材料致密度的影响; 对比分析了不同类型铜基体对石墨/铜复合材料性能的影响; 考察了石墨质量分数为6%、8%、10%和12%时, 石墨/弥散强化铜复合材料(Graphite/ODS-Cu)的导电性、冲击韧性及摩擦系数。结果表明: 烧结温度对材料致密度影响较大, 石墨/弥散强化铜复合材料在加压烧结温度达到950 ℃后全致密; 采用弥散强化铜为基体, 提高了滑板的力学性能, 当石墨含量为10%时, 其导电性能下降不明显, 但是冲击韧性远远高于采用普通铜粉为基体的样品; 石墨含量对滑板的性能影响较大, 样品的导电性和冲击韧性随着石墨含量的增加而急剧下降, 在石墨含量增加到10%时, 其电阻率和冲击韧性分别为0.65 μΩ·m和6.8 J·cm^-2; 摩擦系数随着石墨含量的增加而降低, 在石墨含量为10%时, 其摩擦系数为0.231。

Preparation and properties of the new type copper matrix pantograph slider

A new type copper matrix pantograph slider was prepared by pressure sintering in vacuum.In this material,the oxide dispersion strengthened(ODS) copper was used as matrix and the copper-coated graphite as lubrication-component.The influence of sintering temperature on the relative density was studied;Effect of different matrix material on properties was researched;Properties including conductivity,impact toughness and friction coefficient of the graphite/ODS-Cu with 6%,8%,10%,and 12% mass fraction of graphite was studied.Results show that sintering temperature has large effect on the density.A fully dense material is achieved while the sintering temperature is 950 ℃.The mechanical properties increase by using the ODS copper powder as matrix.When the content of graphite is 10%,impact toughness of the samples with ODS copper as matrix is much higher than that of with non-ODS copper as matrix,while the conductivity has not much degradation.Conductivity and impact toughness of the material decrease drastically as the content of graphite increases,which reach to 0.65 μΩ·m and 6.8 J·cm-2 respectively with 10% graphite.Friction coefficient of the material decreases with the graphite content increasing,which is 0.231 with 10% graphite.