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为了简化工艺及提高性能,采用热压烧结一步法制备Cf/Cu复合材料。研究了Cf/Cu复合材料的界面反应原理、微观形貌及不同的Ti添加量对复合材料密度、硬度、强度等性能的影响。结果表明:Cu-C-Ti三元体系,在低于1100℃,碳纤维表面生成TiC层,该反应层降低了液态Cu与碳纤维的润湿角,改善了Cu与碳纤维的界面结合。探讨了TiC层的形成机制,提出了溶解在Cu液中的Ti原子与碳纤维接触生成TiC的微观反应模型。TiC层的形成有利于提高复合材料的性能。当Ti的质量分数为16.7%时,Cf/Cu复合材料的综合性能最好,其肖氏硬度高达HS66.94,抗弯强度为97.59 MPa。
In order to simplify the process and improve the performance, Cf / Cu composites were prepared by one-step hot pressing. The effects of interfacial reaction, microstructure and Ti addition on the density, hardness and strength of Cf / Cu composites were studied. The results show that TiC layer is formed on the surface of carbon fiber below 1100 ℃ in Cu-C-Ti ternary system. The reaction layer reduces the wetting angle between liquid Cu and carbon fiber and improves the interfacial bonding between Cu and carbon fiber. The formation mechanism of TiC layer was discussed. The microscopic reaction model of TiC formed by contact of Ti atoms dissolved in Cu solution with carbon fiber was proposed. The formation of TiC layer is conducive to improve the performance of composite materials. When the mass fraction of Ti is 16.7%, Cf / Cu composites have the best comprehensive properties, the Shore hardness reaches as high as HS66.94 and the flexural strength is 97.59 MPa.