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Toughening and hardening in double-walled carbon nanotube/nanostructured magnesia composites

Peigney, Alain and Legorreta Garcia, Felipe and Estournès, Claude and Weibel, Alicia and Laurent, Christophe Toughening and hardening in double-walled carbon nanotube/nanostructured magnesia composites. (2010) Carbon, vol.48 (n° 7). pp. 1952-1960. ISSN 0008-6223

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Official URL: http://dx.doi.org/10.1016/j.carbon.2010.01.063

Abstract

Dense double-walled carbon nanotube (DWCNT)/nanostructured MgO composites were prepared using an in situ route obviating any milling step for the synthesis of powders and consolidation by spark-plasma-sintering. An unambiguous increase in both toughness and microhardness is reported. The mechanisms of crack-bridging on an unprecedented scale, crack-deflection and DWCNT pullout have been evidenced. The very long DWCNTs, which appear to be mostly undamaged, are very homogeneously dispersed at the grain boundaries of the matrix, greatly inhibiting the grain growth during sintering. These results arise because the unique microstructure (low content of long DWCNTs, nanometric matrix grains and grain boundary cohesion) provides the appropriate scale of the reinforcement to make the material tough.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Carbon website : http://www.sciencedirect.com/science/journal/00086223
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Nihad Lahdifi

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