Fabrication of carbon nanotube reinforced aluminum composite by powder extrusion process

Junichi Yuuki, Akira Kawasaki, Akira Magano, Toru Noguchi, Junichi Beppu, Masayuki Seki

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

This paper describes a fabrication process of Al/CNT composites and measurement of their mechanical properties. It is a very useful reinforcement for composites since CNT has very high strength and very high Young's modulus. However, it is very difficult to distribute CNT in the metal matrix. Natural rubber, Al powder and CNT precursors were used to improve the distribution of the CNT in Al matrix. CNT distributed mixture with Al powder were obtained using the precursors produced by heat treatment in N2 atmosphere. The Al/CNT mixed powder filled up into Al alloy billets were encapsulated in vacuum atmosphere. Then, the billets were extruded with different extrusion ratios of 5,10 and 20 at 673 K. The composites were observed by optical microscope and FE-SEM. The mechanical properties were evaluated by Vickers hardness and tensile tests. We succeeded in achieving fully densified and finely extruded rod of Al/CNT composites by hot extrusion process. Observation of micro structures after hot extrusion revealed that CNT aligned along the extrusion direction. Vickers hardness and tensile strength obtained were about twice compared to pure Al.

Original languageEnglish
Pages (from-to)627-634
Number of pages8
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume54
Issue number9
DOIs
Publication statusPublished - 2007 Sep

Keywords

  • Carbon nanotube reinforced aluminum composite
  • Extrusion process
  • Mechanical properties

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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