SPS法制备铜-2%碳纳米管复合材料

Cu-2% carbon nanotube composites fabricated by SPS

首先采用颗粒复合法（PCS,Particle Composite System）对Cu-碳纳米管（CNT）粉末进行表面改性处理,得到CNT镶嵌或包覆于较软微米Cu颗粒表面的复合粉,其形貌近似球形,然后将复合粉通过SPS烧结工艺制备成Cu-2%（质量分数）CNT复合材料。通过硬度测试、密度测试、SEM形貌观察和能谱分析,研究了PCS处理时间对Cu-2%CNT复合材料的组织和性能的影响并与普通混粉后的复合材料做了比较。结果表明,随着PCS处理时间的延长,复合粉末粒径不断减小,在40min以后,随时间的延长,粒径基本保持不变。与纯Cu相比,经PCS处理后制备的Cu-2%CNT复合材料硬度有26%-34%的提高,与普通混粉24h相比提高了20%-26%;CNT在铜基体中呈连通的网状结构,复合材料的致密度达97%以上。

A particle compositing method was used to perform the particle surface modification of Cu-carbon nanotube （Cu/CNT） mixed powders, which were subsequently consolidated into the Cu/CNT composites by spark plasma sintering （SPS） technique. The composite powders, with embedding CNTs in soft micro-sized copper powders were approximately spherical. The effect of PCS time on the microstructure and properties of the composites were investigated through the tests of micro-hardness, density and SEM observations combined with energy spectrum analysis. The results show that the particle size decrease with increasing PCS time and keep nearly invariant after 40min. The CNTs behave network structure in copper matrix. The micro-hardness of the composites with PCS treated powders increase by 26%-34% and 20% - 26% compared with that of the composites with ordinary mechanical mixed powders and pure copper powders, respectively. The relative density of the composites can achieve as high as 97%.