Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7889805 | Composites Part A: Applied Science and Manufacturing | 2018 | 12 Pages |
Abstract
Carbon nanotube/aluminum (CNT/Al) composites are prepared by a combination of flake powder metallurgy and hot-isostatic-pressing. The specimens are investigated by several techniques including Raman spectroscopy, optical microscopy, scanning- and transmission electron microscopy. The composites show a layered-microstructure with a stacking of CNT/Al flakes with a CNT-rich layer between two flakes. The individual Al grains forming the flakes are about 500â¯nm in size. The CNTs are well dispersed within a flake and they bridge the micro-cracks. The results reveal that the coefficient of thermal expansion (CTE) decreases markedly upon the increase in carbon content, reaching 15.4â¯Ãâ¯10â6â¯Kâ1 for the specimen with a carbon content of 2.0â¯wt% (2.9â¯vol%), i.e. a 30% decrease compared to the CTE of pure Al. This could arise from the layered-microstructure resulting from the utilization of Al flakes as opposed to rounded particles.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Pham Van Trinh, Nguyen Van Luan, Doan Dinh Phuong, Phan Ngoc Minh, Alicia Weibel, David Mesguich, Christophe Laurent,