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Microstructure, microhardness and thermal expansion of CNT/Al composites prepared by flake powder metallurgy

Trinh, Pham Van and Luan, Nguyen Van and Phuong, Doan Dinh and Minh, Phan Ngoc and Weibel, Alicia and Mesguich, David and Laurent, Christophe Microstructure, microhardness and thermal expansion of CNT/Al composites prepared by flake powder metallurgy. (2018) Composites Part A: Applied Science and Manufacturing, 105. 126-137. ISSN 1359-835X

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Official URL: http://dx.doi.org/10.1016/j.compositesa.2017.11.022

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 500 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 15.4 x 10-6 K-1 for the specimen with a carbon content of 2.0 wt% (2.9 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.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original PDF of the article can be found a https://www.sciencedirect.com/science/article/pii/S1359835X17304281
HAL Id:hal-01728899
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Vietnam Academy of Science and Technology - VAST (VIETNAM)
Laboratory name:
Funders:
Key Laboratory for Electronic Materials and Devices, IMS - Erasmus Mundus Action 2
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Deposited By: cirimat webmestre
Deposited On:12 Mar 2018 09:50

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