An effective approach to reinforced closed-cell Al-alloy foams with multiwalled carbon nanotubes |
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| Affiliation: | 1. Department of Mechanical Engineering, TEMA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal;2. Department of Materials and Ceramics Engineering, CICECO, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal;1. Department of Mechanical Engineering, TEMA, University of Aveiro, Campus Universitário de Santiago, 3810–193 Aveiro, Portugal;2. Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, R. Boškovića 32, HR-21000 Split, Croatia;3. Faculty of Mechanical Engineering, University of Maribor, Smetanova ul. 17, SI-2000 Maribor, Slovenia;1. Saarland University, Lehrstuhl für Technische Mechanik, Campus A4.2, 66123 Saarbrücken, Germany;2. Saarland University, Lehrstuhl für Experimentalphysik, Campus D2.2, 66123 Saarbrücken, Germany;3. Saarland University, Lehrstuhl für Experimentelle Methodik der Werkstoffwissenschaften, Campus D2.2, 66123 Saarbrücken, Germany;1. European Aeronautic Defence and Space Company, EADS Innovation Works, Metallic Technologies and Surface Engineering, 81663 Munich, Germany;2. Université Montpellier 2, Laboratoire Charles Coulomb, UMR 5521 CNRS, 34095 Montpellier, France;3. Université Montpellier 2, Institut Charles Gerhardt, UMR 5253 CNRS-UM2-ENSCM-UM1, 34095 Montpellier, France;1. Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Sungkyunkwan University, Suwon, 440-746, Republic of Korea;2. Department of Energy Science, Sungkyunkwan University, Suwon, 440-746, Republic of Korea;1. Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2. Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China;3. Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract: | Exploring the reinforcing role of carbon nanotubes to obtain materials (polymers, metals, ceramics) with enhanced properties has been often attempted, but the success is strongly limited by the dispersing degree of carbon nanotubes. Here we report on an innovative colloidal approach to disperse the carbon nanotubes in the powders mixture of the precursor materials in order to profit from their reinforcing potential and obtain a new class of closed-cell metal foams. The feasibility of the proposed approach was demonstrated for aluminium foams reinforced with multi-walled carbon nanotubes. These nanocomposite metal foams synergistically combine the remarkable properties of both metal foams and carbon nanotubes. The results indicate that the tubular structure of carbon nanotubes is preserved throughout the entire the process. The carbon nanotubes are individually dispersed, stretched and randomly aligned in the aluminium-matrix of these closed-cell foams, thus potentiating their homogeneous 3D reinforcing role. Accordingly, the Vickers micro-hardness of the closed-cell foams was greatly enhanced. |
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| Keywords: | Aluminium alloy foams Carbon nanotubes Nanocomposite metal foams Colloidal processing Powder metallurgy |
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