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Journal of Nanomaterials
Volume 2009, Article ID 325674, 5 pages
http://dx.doi.org/10.1155/2009/325674
Research Article

The Effect of Nanosized Carbon Black on the Physical and Thermomechanical Properties of A l 2 O 3 - S i C - S i O 2 - C Composite

Department of Ceramics, Materials and Energy Research Centre (MERC), Meshkin-Dasht Road, Karaj 3177983634, Iran

Received 24 September 2008; Accepted 22 January 2009

Academic Editor: Alan K. T. Lau

Copyright © 2009 Mohamad Hassan Amin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effects of using nanosized carbon black in the range of 0–10 weight percentages on the physical and thermomechanical properties of A l 2 O 3 - S i C - S i O 2 –graphite refractory composites were investigated. Nanosized carbon black addition improved the relative heat resistance and oxidation resistance of composites. The bulk density of the composites is reduced with increasing carbon black (CB) content. Increase in CB content first causes an increase in the apparent porosity, but at more than 3 wt% amount of CB, a decrease of apparent porosity was observed. The cold crushing strength (CCS) increased with increasing CB content in samples fired at 8 0 0 C and in samples fired at 1 5 0 0 C when the content is increased to 3 wt%, but the CCS decreased with increasing CB content in samples fired at 1 5 0 0 C when the CB content was less than 3 wt%. The composite without CB exhibits the highest value of CCS at firing temperature of 1 5 0 0 C .