resumo
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. (C) 2015 Elsevier Ltd. All rights reserved.
palavras-chave
ALUMINUM-MATRIX COMPOSITES; POWDER-METALLURGY; MANUFACTURE; PERFORMANCE; STRENGTH; KINETICS; TUBES
categoria
Chemistry; Materials Science
autores
Duarte, I; Ventura, E; Olhero, S; Ferreira, JMF
nossos autores
José Maria da Fonte Ferreira
Professor Associado com Agregação
Susana Maria Henriques Olhero
Investigador Principalagradecimentos
This work was supported by TEMA (Centre for Mechanical Technology and Automation, www.ua.pt/tema) through the cost center CC/ID/CS/2.30.400.20.12. This work was also supported by the European Regional Development Fund (FEDER) under the PT2020 Partnership Agreement through the COMPETE, by the Portuguese Government through the Portuguese Foundation for Science and Technology (FCT), in the scope of the projects UID/CTM/50011/2013 (Aveiro Institute of Materials, CICECO, www.ciceco.ua.pt).