中文摘要：

为制备能够在Cu基体中分散均匀的大体积分数的短碳纤维（C_f）/Cu复合材料,采用电化学法在C_f表面进行了镀Cu处理,用平行Cu片做阴极代替长碳纤维束,得到镀层均匀光洁的镀Cu短C_f。在此基础上,将2V,30min条件下的C_f/Cu复合丝直接采用放电等离子烧结（SPS）制备了46vol%C_f/Cu复合材料（试样1）,又用Cu粉与未包覆的C_f直接混合再烧结制备了另一种46vol%C_f/Cu复合材料（试样2）。利用XRD和SEM分别研究了C_f/Cu复合丝和C_f/Cu复合材料的物相成分、表面及断口形貌,对C_f原丝、C_f/Cu复合丝以及用2种方式制备的C_f/Cu复合材料进行了力学性能研究。结果表明：C_f/Cu复合丝拉伸载荷-位移曲线上出现了较大幅度的波动,这与其表面镀Cu层受力时发生不连续断裂有关。试样1组织的均匀性及力学性能均优于试样2。与Cu相比,用2种不同方法制备的C_f/Cu复合材料的抗拉强度低于Cu,但屈服强度比Cu高。

英文摘要：

To prepare a uniformly dispersed short carbon fibre （Cf）/Cu composite in Cu matrix which contained a large volume fraction of Cf, by an electro-chemical method in the process of Cu plating on the surface of Cf, a parallel Cu fosil was used as cathode instead of long carbon fibre bundle. By which, more homogeneous and smooth Cuplating short Cf were obtained. Based on that, the 46vol% Cf/Cu composite （sample 1）was prepared directly by spark plasma sintering （SPS） with those Cf/Cu composite filament prepared at 2 V, 30 min. Then non-coated Cf mixed with Cu powder were used to prepare another Cf/Cu composite（sample 2）. The phase composition, surface and fracture morphology of Cf/Cu composite filament and the Cf/Cu composites were researched through XRD and SEM. After that, there was a comparison with these samples on the mechanical properties. Results show that the Cu coating creates discontinuous fractures under load, which causes fluctuations in the tensile load-displacement curve of Cf/Cu composite filament. Besides, the uniformity and mechanical properties of sample 1 are higher than sample 2. The tensile strengths of Cf/Cu composites made by two different ways are lower than Cu, but the yield strengths are higher.