三维互通CNTs/Cu复合材料的制备及力学性能研究

对CuCr合金粉末固溶时效处理之后进行预烧结，得到CuCr预压块。以此预压块为基底，采用化学气相沉积（chemical vapor deposition, CVD）工艺和放电等离子烧结（sparking plasma sintering, SPS）工艺成功制备了三维互通的碳纳米管/铜（carbon nanotubes/Cu, CNTs/Cu）复合材料。采用扫描电子显微镜（scanning electron microscope, SEM），拉曼光谱仪等表征碳纳米管的微观组织结构，利用微拉伸试验机测试复合材料的力学性能。研究结果表明，Cr作为催化剂，对碳纳米管的形貌影响很大，碳纳米管的质量也会对复合材料的力学性能产生影响。当Cr的质量分数为0.6%时，碳纳米管在铜基体表面均匀分布，CNTs/Cu复合材料的力学性能最佳。经SPS烧结和轧制之后，复合材料的导电率和屈服强度分别达到了82.4% IACS和349 MPa，断裂伸长率高达6.4%，这是由于CNTs的加入，起到了第二相强化的作用，提高了复合材料的力学性能。

Preparation and Mechanical Properties of 3D Intercommunicated CNTs/Cu Composite Materials

The CuCr alloy powder was pre-sintered after solution aging treatment to obtain a CuCr pre-press. Using it as a substrate, 3D intercommunicated carbon nanotubes/copper (CNTs/Cu) composites were successfully prepared by chemical vapor deposition (CVD) and sparking plasma sintering (SPS) processes. The microstructure of the material were characterized by scanning electron microscope (SEM) and Raman spectrometer. The mechanical properties of the material were measured by micro-tensile testing machine. The results show that as a catalyst, Cr has a great influence on the morphology of carbon nanotubes, and the quality of carbon nanotubes also affects the mechanical properties of the composites. When the mass fraction of Cr is 0.6%, CNTs are evenly distributed on the surface of copper matrix, and the mechanical properties of CNTs/Cu composites are the best. After SPS sintering and rolling, the electrical conductivity and yield strength of the composite reach 82.4% IACS and 349 MPa, respectively, and the fracture elongation is up to 6.4%. This is due to the addition of CNTs, which plays a second phase strengthening role and improves the mechanical properties of the composite.