镀钨碳纳米管增强铜基复合材料的制备及性能

采用羰基热分解法对多壁碳纳米管表面进行镀钨处理,并以镀钨碳纳米管和电解铜粉为原料,进行机械球磨混粉和放电等离子体烧结,制备了镀钨碳纳米管/铜基复合材料.采用场发射扫描电镜观察了粉体和复合材料的组织形貌,并对复合材料物相进行了X射线衍射分析.探讨了镀钨碳纳米管含量和放电等离子体烧结温度对复合材料致密度、抗拉强度、延伸率和电导率的影响.结果表明,镀钨碳纳米管质量分数为1%和烧结温度为850℃时,复合材料的致密度、抗拉强度和电导率最高.与烧结纯铜相比,复合材料的抗拉强度提高了103.6%,电导率仅降低15.9%. 

Fabrication and properties of Cu matrix composites reinforced by tungsten-coated carbon nanotubes

Multi-walled carbon nanotubes (CNTs) were coated with tungsten layers using a carbonyl thermal decomposition process. The tungsten-coated carbon nanotubes (W-CNTs) and electrolytic copper powders were used as starting materials to fabricated W-CNT/Cu composites by mechanical milling and spark plasma sintering (SPS). The morphologies and microstructures of the mixed powders and the sintered composite bulks were characterized by field-emission scanning electron microscopy (SEM), and the phase analysis of the sintered composite bulks was carried out by X-ray diffraction (XRD). The influences of W-CNT content and sintering temperature on the relative density, tensile strength, elongation and electrical conductivity of the W-CNT/Cu composites were investigated. The experimental results show that the 1% W-CNT added composites sintered at 850℃ have the maximum relative density, tensile strength and electrical conductivity. In comparison with the sintered pure Cu bulk, the tensile strength increases by 103.6% but the electrical conductivity decreases only by 15.9% for the W-CNT/Cu composites.