2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 8: Surfaces and Interfaces(SISAM), Composite, Ceramic and Nanomaterials
| Editors: | Kongoli F, Braems I, Demange V, Dubois JM, Pech-Canul M, Patino CL, Fumio O |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 249 pages |
| ISBN: | 978-1-987820-75-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Carbon Nanotube-Reinforced Aluminum Matrix Composites Fabricated by Hot Extrusion of Ball-milled Powders Encapsulated in Aluminum Containers
Fumio Ogawa1; Chitoshi Masuda2;1RITSUMEIKAN UNIVERSITY, Kusatsu, Japan; 2KAGAMI MEMORIAL INSTITUTE FOR MATERIALS SCIENCE AND TECHNOLOGY, WASEDA UNIVERSITY, Shinjuku-ku, Japan;
Type of Paper: Regular
Id Paper: 229
Topic: 18
Abstract:
Carbon nanotubes (CNTs) and aluminum powder were mixed using ball-milling. Two types of CNTs were adopted; one is vapor grown carbon fibers (VGCFs) with average diameter of 150 nm, while the other is multi-walled carbon nanotubes (MWCNTs) with average diameter of 65 nm. Mixing of CNTs with aluminum powder was performed at rotation speed of 200 rpm and mixing duration was 3 h. The weight fraction of stainless-steel balls to the mixture of CNT and aluminum powder was 20:1. The mixed powders were encapsulated in the A1050 containers in vacuum of 10-5 Torr. Then, the container was served as an extrusion billet. Hot extrusion was performed at 550 oC with extrusion ratio of 9. Composites reinforced by above mentioned two types of CNTs were fabricated using the same condition. Mechanical and thermal properties of composites were evaluated. Vickers microhardness of both of composites was higher than 100HV, and it increased with reinforcement volume fraction. That of MWCNT-reinforced composites was higher than that of VGCF-reinforced composites. Tensile strength of MWCNT-reinforced composites was also higher than that of VGCF-reinforced composites and was over 450 MPa. Fracture strain of 0.5% MWCNT-reinforced composite was 37.2% that was the highest among the values reported in the literature. Thermal conductivity of VGCF-reinforced composites was higher than that of MWCNT-reinforced composites. That of 0.5% VGCF-reinforced composites was 203.7 W/mK. Composites with tensile strength, fracture strain and thermal conductivity that are high compared to the values reported in past could be fabricated via simple process except for minimizing CNTs damage during mixing and by prevention of oxidation and excessive reaction of CNTs with aluminum matrix retaining effective densification during hot extrusion.
Keywords:
Aluminum; Composites; Mechanical; Nanotubes;References:
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