Sarkar, Soumya and Das, Probal Kumar (2012) Temperature and load dependent mechanical properties of pressureless sintered carbon nanotube/alumina nanocomposites. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 531. pp. 61-69. ISSN 0921-5093

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Abstract

Multiwalled carbon nanotube (MWCNT)/alumina (Al2O3) nanocomposites having different CNT contents have been fabricated by wet-mixing and pressureless sintering in Argon at 1700 degrees C. Depending on indentation load, the highest improvement of 15-34% in hardness was achieved in 0.3 vol.% MWCNT/Al2O3 nanocomposite. Indentation size effect (Mayer's exponent = 1.753) on hardness was the most prominent in 1.2 vol.% MWCNT/Al2O3 nanocomposite due to presence of clustered CNTs, non-uniform interface and porous microstructure. similar to 34% increase in fracture toughness was achieved in 0.3 vol.% MWCNT/Al2O3 nanocomposite than pure Al2O3 (similar to 3.84 MPa m(0.5)). High MWCNT loaded nanocomposites had reduced R-curve sensitivity because of increased matrix grain refining effect and reduced matrix compressive residual stress. High temperature flexural strength results indicated that strength retention of nanocomposites up to 1100 degrees C in ambient was much better compared to pure Al2O3. To predict structure-property relationship in nanocomposites, detailed microstructural and fractographic studies were also performed. (C) 2011 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	Composites; Mechanical characterization; Electron microscopy
Subjects:	Engineering Materials
Divisions:	Non-Oxide Ceramics & Composites
Depositing User:	Bidhan Chaudhuri
Date Deposited:	05 Jun 2012 10:10
Last Modified:	05 Jun 2012 10:10
URI:	http://cgcri.csircentral.net/id/eprint/1475

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