Optimizing the interface bonding in Cu matrix composites by using functionalized carbon nanotubes and cold rolling
Optimizing the interface bonding in Cu matrix composites by using functionalized carbon nanotubes and cold rolling
复制标题
使用功能化碳纳米管和冷轧优化铜基复合材料中的界面结合
DOI：
10.1557/jmr.2019.223
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发表时间：
2019-08-14
影响因子：
2.7
通讯作者：
Yi, Jianhong
中科院分区：
文献类型：
--
作者：
Liu, Guijun;Tao, Jingmei;Yi, Jianhong
碳纳米管（CNTs）在铜基体中的分散不均匀和界面结合不牢固是影响CNTs/ Cu复合材料强度和塑性的两个关键因素。在放电等离子烧结和冷轧工艺制备的碳纳米管/铜复合材料中，采用酸处理后的碳纳米管表面预镀镍层，以提高碳纳米管的分散均匀性和碳纳米管与铜基体的界面结合。扫描电子显微镜分析显示，与未涂覆的碳纳米管相比，烟酸化的碳纳米管（Ni-CNTs）在复合材料中均匀分散。透射电子显微镜观察表明，在Ni-CNT/ Cu复合材料的界面处原位生成了Cu_2 O纳米粒子，而Ni涂层未覆盖CNT。轧制后，镍基碳纳米管沿轧制方向沿着成带状分布.轧制1vol % Ni-CNT/ Cu复合材料的抗拉强度达到261 MPa，比轧制前提高了24.3%。2 vol% Ni-CNT/ Cu复合材料的抗拉强度明显降低，这可能是由于体积含量增加导致Ni-CNT在Cu基体中团聚所致。
Nonuniform dispersion and weak interfacial bonding between carbon nanotubes ( CNTs) and Cu matrix are two critical issues for achieving high strength and good ductility of CNT/ Cu composites. Here, acid- treated CNTs precoated with Ni coatings were used to enhance the dispersion uniformity of CNTs and interfacial bonding between CNTs and Cu matrix in the CNT/ Cu composites fabricated through spark plasma sintering and subsequently cold rolling. Scanning electron microscopy analysis revealed the homogeneous dispersion of Nicoated CNTs ( Ni- CNTs) in the composite compared with uncoated CNTs. Transmission electron microscope observation indicated that Cu2O nanoparticles were in situ formed at the interface in Ni- CNT/ Cu composite, where CNTs were uncovered by Ni coatings. After rolling, the distribution of Ni- CNTs transformed into ribbons aligning along the rolling direction. The ultimate tensile strength ( UTS) of 261 MPa was achieved in rolled 1 vol% Ni- CNT/ Cu composite, which was 24.3% higher than that before rolling. The UTS of 2 vol% Ni- CNT/ Cu composite obviously decreased, which could be attributed to the agglomeration of Ni- CNTs in the Cu matrix due to the increased volume content.