以碳纳米管(CNTs)、碳化硅(SiC)粉体、锌(Zn)粉和CuSO_4·5H_2O为主要原料,用化学镀的方法制备CNTs /Cu复合粉体,再采用非均相沉淀法制备CNTs/SiC/Cu复合粉体.在750 ℃、100 MPa的制度下进行真空热压烧结后制得CNTs/SiC/Cu复合材料,其中Cu的含量(体积分数,下同)为70%,CNTs的含量(体积分数, 下同)分别为0,3%,5%,8%,12%.利用XRD、SEM分析样品的物相组成和显微结构;利用阿基米德排水法、显微硬度计、三点弯曲法测试了复合材料的密度、显微硬度和抗弯强度.结果表明,随着碳纳米管含量的增加,CNTs/SiC/Cu复合材料的密度、显微硬度和抗弯强度等性能发生相应变化,其中,抗弯强度呈现逐渐升高趋势.与未添加碳纳米管的30SiC/70Cu复合材料相比,添加12%CNTs的12CNTs/18SiC/70Cu 样品,抗弯强度提高了21.45 MPa.
Using carbon nanotubes (CNTs), silicon carbide (SiC) powders, zinc (Zn) powders and CuSO_4·5H_2O as the main raw materials, the CNTs /Cu composite powders were prepared by the chemical plating method, and the CNTs /SiC/Cu composite powders were prepared by heterogeneous deposition method. The CNTs/SiC/Cu composites were prepared by vacuum hot pressing under the condition of 750 ℃ and 100 MPa. These composites samples consist of Cu (70%), CNTs (0, 3%, 5%, 8% and 12%) and SiC powders (30%, 27%, 25 %, 22% and 18%), respectively. XRD, SEM, Archimedes method, microhardness instrument and universal testing machine were used to investigate these composites. It is revealed that the density, the microhardness and the bending strength change with the increasing of the CNTs content. Among them the bending strength increases gradually with the increasing of CNTs content. Compared with the 30SiC/70Cu composites, the bending strength enhanced by 21.45 MPa for the 12CNTs/18SiC/70Cu composites.
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