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研究了碳纤维表面镀Cu的前处理和化学镀的工艺、条件等参数,采用SEM和XRD对镀Cu短碳纤维的形貌和成分进行了分析。通过粉末冶金制备了短碳纤维增强Cu基复合材料,研究了短碳纤维体积分数对复合材料的密度、硬度和电导率等的影响。结果表明,采用380℃灼烧30min为较佳的碳纤维除胶工艺;与超声分散和磁力搅拌相比,采用电动搅拌时短碳纤维分散性好,且化学镀Cu镀层均匀致密。随着镀Cu短碳纤维含量的增加,复合材料的密度和电导率呈现下降的趋势,硬度呈现先提高后降低的趋势,其中在镀Cu短碳纤维含量达12.5%时,Cu基复合材料硬度值最高;镀Cu的短碳纤维Cu基复合材料的物理性能优于未镀Cu的短碳纤维复合材料。
The parameters of pretreatment and electroless plating of carbon fiber on the surface of carbon fiber were studied. The morphology and composition of the coated carbon fiber were analyzed by SEM and XRD. The short carbon fiber reinforced Cu matrix composites were prepared by powder metallurgy. The effects of the volume fraction of short carbon fibers on the density, hardness and electrical conductivity of the composites were investigated. The results showed that the best carbon fiber removal process was obtained by burning at 380 ℃ for 30 min. Compared with ultrasonic dispersion and magnetic stirring, the dispersion of short carbon fiber was good and the electroless Cu coating was uniform and compact. With the increase of the content of Cu-coated short carbon fibers, the density and electrical conductivity of the composites showed a downward trend, the hardness of the composites tended to increase firstly and then decrease. The hardness of Cu-based composites was the highest when the content of Cu short carbon fibers was 12.5% The physical properties of Cu-coated short carbon fiber Cu-based composites are better than those of uncoated short carbon fiber composites.