Journal
CERAMICS INTERNATIONAL
Volume 39, Issue 6, Pages 6827-6834Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.02.014
Keywords
Porosity; Strength; SiC; Sodium borate
Categories
Funding
- Fundamental Research Program of the Korean Institute of Materials Science (KIMS)
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Porous silicon carbide ceramics were fabricated from SiC, sodium borate, and starch at temperatures as low as 650-800 degrees C by a simple pressing and heat-treatment process. The effects of heat treatment temperature and starch content on the porosity and strength of the ceramics were investigated. During heat treatment, the sodium borate transformed to a viscous phase, which acted as the bonding material between SiC particles, and the starch decomposed into gases, leaving pores. The porosity of the porous SiC ceramics could be controlled within a range of 47-64% with the present set of processing conditions. The porous SiC ceramics showed a maximum 64% porosity when 43.2 wt% SiC particles and 10.8 wt% sodium borate were used with 46 wt% starch. Flexural strength was at a maximum (37 MPa at 52% porosity) when the sintering temperature was 750 degrees C and the starch content was 40 wt%. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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