Table of Contents
ISRN Materials Science
Volume 2011, Article ID 763296, 7 pages
Research Article

Densification and Microstructural Evolutions during Reaction Sintering of SiC-Si-C Powder Compacts

1Department of Materials Engineering, Faculty of Mechanical Engineering, University of Tabriz, P.O. Box 51666, Tabriz 16471, Iran
2Faculty of Materials and Manufacturing Technology, Malek Ashtar University of Technology, Tehran, Iran

Received 11 May 2011; Accepted 6 June 2011

Academic Editors: J. F. Bartolomé, U. Gomes, and W. Jiang

Copyright © 2011 H. Asgharzadeh and N. Ehsani. 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.


Porous SiC-Si-C ceramics were produced by reaction sintering (RS) of silicon carbide, silicon, and carbon powder compacts in the temperature range of 1400–1600°C. The effects of chemical composition of the starting powder, initial SiC particle size, and reaction sintering temperature and duration on the densification and microstructure of ceramic materials were studied. The results showed that increasing the amount of Si and/or C powders in the starting powder mixture had a detrimental influence on the densification of ceramic material as a result of higher amount of remained silicon and carbon phases in the ceramic specimen. Increasing the RS temperature also degraded densification due to the melting of Si and coming out of it from compact during heating. Nevertheless, densification was improved by increasing the RS duration. Using nanometric SiC particles in the starting powder mixture improved the densification compared to that of micrometric ones especially at longer RS processing duration.