(中南大学 轻质高强结构材料国防科技重点实验室，长沙 410083)
摘 要: 以电解铜粉、树脂包覆石墨粉和二氧化硅粉为原料，经粉末冶金和冷压成坯块后，分别采用常压烧结和加压烧结工艺制备树脂碳包覆石墨/铜复合材料，对比两种烧结工艺制备的树脂碳包覆石墨/铜复合材料与现有法国罗兰MCXXP牌号电刷高速列车用接地电刷的显微组织和导电、力学、摩擦磨损性能。结果表明：与常压烧结材料相比，采用加压烧结制备的树脂碳包覆石墨/铜复合材料中，铜相的连通性更好，石墨分布更离散均匀，二氧化硅更好、更多地被嵌入铜基体，复合材料的密度、抗弯强度、硬度、导电和摩擦磨损性能显著提高，且与法国罗兰MCXXP牌号电刷的性能相当。
关键字: 加压烧结；树脂碳包覆石墨/铜复合材料；导电性；力学性能；摩擦性能
（National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha 410083, China）
Abstract:Using electrolytic copper powder, resin-coated graphite powder and silicon dioxide powder as raw materials, resin-carbon coated graphite/copper composites were prepared by using traditional powder metallurgical mixing, cold pressure and normal sintered or pressure sintered techniques, respectively. And then, the microstructure, electrical conductivity, mechanical property, friction and wear performance of these composites were compared with the grounded brushes prepared by two sintering processes for high-speed trains, France Roland MCXXP brand brushes. The results show that, compared with normal sintered resin carbon-coated graphite/copper composites, the pressure sintered resin-carbon coated graphite/copper composites have better connectivity copper matrix, more uniform dispersion of graphite, and more silica phases are better embedded in the copper matrix. The density, flexural strength, hardness, electrical conductivity and friction and wear properties are significantly improved, which are similar to those of the French Roland MCXXP brand brushes.
Key words: pressure sintered; resin coated graphite/copper composite; electrical conductivity; mechanical property; friction property
