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| Azevedo, Nuno Monteiro |
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Minh, Phan Ngoc
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Topics
Publications (6/6 displayed)
- 2024Effect of Powder Preparation Techniques on Microstructure, Mechanical Properties, and Wear Behaviors of Graphene-Reinforced Copper Matrix Compositescitations
- 2020Enhanced mechanical properties and wear resistance of cold-rolled carbon nanotubes reinforced copper matrix compositescitations
- 2020Solar Cell Based on Hybrid Structural SiNW/Poly(3,4 ethylenedioxythiophene): Poly(styrenesulfonate)/Graphenecitations
- 2018Microstructure, microhardness and thermal expansion of CNT/Al composites prepared by flake powder metallurgycitations
- 2018Microstructure, microhardness and thermal expansion of CNT/Al composites prepared by flake powder metallurgycitations
- 2013A method to obtain homogeneously dispersed carbon nanotubes in Al powders for preparing Al/CNTs nanocomposite
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article
Microstructure, microhardness and thermal expansion of CNT/Al composites prepared by flake powder metallurgy
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.