Table of Contents
Journal of Powder Technology
Volume 2013, Article ID 695895, 5 pages
Research Article

Effect of Crack Healing of SiC according to Times of SiO2 Colloid Coating

Department of Materials Science and Engineering, Pukyong National University, 365, Sinseonro, Nam-ku, Busan 608-739, Republic of Korea

Received 17 March 2013; Accepted 20 May 2013

Academic Editor: Kotoji Ando

Copyright © 2013 Ki Woo Nam. 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.


Crack healing behavior of SiC ceramics with large crack width has been studied as a function of coating and heat treatment. The SiO2 colloid coating was carried out on two types: hydrostatic pressure coating and roll coating. The crack healing was one hour at 1173 K in air. The crack part formed SiO2 oxides until the critical times by a hydrostatic pressure method. The crack does not anymore heal if it exceeds the critical times. The crack part and the base part have many O components and Si components regardless of the times of coating and heat treatment. The combined hydrostatic and rolling coating method did not have nearly an effect on crack-healing for large crack width over 1.4  m. The study for more effective healing of a large crack width must be carried out in the future.