(中南大學(xué) 輕質(zhì)高強(qiáng)結(jié)構(gòu)材料國(guó)防科技重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 以電解銅粉、樹(shù)脂包覆石墨粉和二氧化硅粉為原料，經(jīng)粉末冶金和冷壓成坯塊后，分別采用常壓燒結(jié)和加壓燒結(jié)工藝制備樹(shù)脂碳包覆石墨/銅復(fù)合材料，對(duì)比兩種燒結(jié)工藝制備的樹(shù)脂碳包覆石墨/銅復(fù)合材料與現(xiàn)有法國(guó)羅蘭MCXXP牌號(hào)電刷高速列車用接地電刷的顯微組織和導(dǎo)電、力學(xué)、摩擦磨損性能。結(jié)果表明：與常壓燒結(jié)材料相比，采用加壓燒結(jié)制備的樹(shù)脂碳包覆石墨/銅復(fù)合材料中，銅相的連通性更好，石墨分布更離散均勻，二氧化硅更好、更多地被嵌入銅基體，復(fù)合材料的密度、抗彎強(qiáng)度、硬度、導(dǎo)電和摩擦磨損性能顯著提高，且與法國(guó)羅蘭MCXXP牌號(hào)電刷的性能相當(dāng)。
關(guān)鍵字: 加壓燒結(jié)；樹(shù)脂碳包覆石墨/銅復(fù)合材料；導(dǎo)電性；力學(xué)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
