【摘要】 用连续电镀法在碳纤维上镀铜后又镀Fe、Ni,制备了镀Cu-Fe、Cu-Ni的双镀层碳纤维。用它们分别制备了CF/Cu-Fe、CF/Cu-Ni复合材料,与V_t相近的CF/Cu复合材料相比,CF/Cu-Fe,CF/Cu-Ni复合材料的电阻率和弯曲强度均有不同程度的提高。通过调整碳纤维的体积分数V_f,复合材料的热膨胀系数可以明显降低。 单向复合材料在断裂后,碳纤维没有明显拔出,CF/Cu-Ni复合材料的断口上,基体出现塑性变形,CF/Cu-Fe复合材料断口上的碳纤维表面上分布着不连续的瘤状物。 用透射电镜分析了这两种复合材料的界面结构。CF/Cu-Fe复合材料中碳纤维表面上的不连续瘤状物是多晶的Fe₃C相,CF/Cu-Ni复合材料的界面区则是Cu-Ni固溶体相。它们对碳纤维与铜基体的结合分别起着反应型和溶解型的强化作用。更多还原

【Abstract】 The unidirectional and random CF/Cu-Fe, CF/Cu-Ni Composites were fabricated by hot press with duplex coated CF which were made by electroplating CF with Cu prior to with Fe or Ni. The electrical resistivities are larger than those of CF/Cu composites at approximate Vf.The linear thermal expansion Coefficients of Composites can be drastically reduced by increasing Vf.From the SEM photos of fracture surfaces, the matrix emerges obvious plastic deformation in CF/Cu-Ni and there are discontinuous nodes on the CF surface in CF/Cu-Fe, but CF have not been pulled out long.The interface structure of composites were examined by TEM.The CF surface in CF/Cu-Fe composites is covered with discontinuous FesC grains and the interface zone between CF and Cu in CF/Cu-Ni Composites. is Cu-Ni solid Solution which can dissolve minute amount of carbon.The interface bonding in CF/Cu-Fc and CF/Cu-Ni composites are strengthened by chemical reactions and dissolution.更多还原