The use of flake powder metallurgy to produce carbon nanotube (CNT)/aluminum composites with a homogenous CNT distribution
The use of flake powder metallurgy to produce carbon nanotube (CNT)/aluminum composites with a homogenous CNT distribution
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利用片状粉末冶金生产CNT分布均匀的碳纳米管（CNT）/铝复合材料
DOI：
10.1016/j.carbon.2011.12.057
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发表时间：
2012-04-01
期刊：
影响因子：
10.9
通讯作者：
Zhang, Di
中科院分区：
文献类型：
--
作者：
Jiang, Lin;Li, Zhiqiang;Zhang, Di
采用一种称为片状粉末冶金（片状 PM）的策略来实现碳纳米管（CNT）在 CNT/Al 复合材料中的均匀分布，从而实现 CNT 作为增强材料的潜力。它包括解决Al粉末与CNT的不相容性、通过浆料混合将CNT均匀吸附到Al纳米片表面以及通过热挤压固结所制备的CNT/Al复合粉末。通过将球形铝粉改为纳米片，并用聚乙烯醇水溶胶对其进行表面改性，片状粉末冶金实现了铝粉与碳纳米管在表面性质和几何形状方面的高度相容性。因此，它本质上利用了这样一个事实：只需通过直接浆料混合即可实现碳纳米管在铝粉中的均匀且单独的分布。此外，由于碳纳米管免受球磨等高能物理力的影响，最终复合材料中碳纳米管的结构完整性得到了很好的保持。结果，制备了一种坚固且具有延展性的 CNT/Al 复合材料，其拉伸强度为 435 MPa，塑性为 6%，大大超过了传统方法制备的材料的值。 (C) 2012 Elsevier Ltd. 保留所有权利。
A strategy called flake powder metallurgy (flake PM) was used to achieve a uniform distribution of carbon nanotubes (CNTs) in CNT/Al composites and thus realize the potential of CNTs as a reinforcement. It consists of the addressing of the incompatibilities of Al powders with CNTs, uniform adsorption of CNTs onto the Al nanoflake surface by slurry blending and consolidation of as-prepared CNT/Al composite powders by hot extrusion. By changing spherical Al powders to nanoflakes and surface modifying them with a polyvinyl alcohol hydrosol, flake PM achieved high compatibilities of Al powders with CNTs, in terms of both surface properties and geometries. Thus, it essentially exploits the fact that a homogeneous and individual distribution of CNTs in Al powders can be achieved simply by direct slurry blending. Moreover, the structural integrity of the CNTs was well maintained in the final composites since CNTs were protected from high energy physics force such as ballmilling. As a consequence, a strong and ductile CNT/Al composite with tensile strength of 435 MPa and plasticity of 6% was fabricated, which greatly surpasses values for materials fabricated by conventional methods. (C) 2012 Elsevier Ltd. All rights reserved.