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Influence Factors on the Porosity and Strength of SiC Porous Ceramic

Author(s): LI Jun-Feng, LIN Hong, LI Jian-Bao

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 9;
Start page: 944;
Date: 2011;
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Keywords: SiC porous ceramics; filtration; flexural strength; porosity

The influence of ceramic binder contents, SiC particle sizes, and sintering temperatures on the porosity and flexural strength of SiC porous ceramics for high―temperature gas filtration were investigated. The composition of SiC porous ceramics was measured by X―ray diffraction. The porosity of SiC porous ceramics decreased with increasing the ceramic binder contents, and the SiC porous ceramic with a relatively high porosity of 37.5% and flexural strength of 27.63MPa was obtained with ceramic binder content of 15wt%. Both the porosity and flexural strength of SiC porous ceramics increased with SiC particle sizes decreasing from 300um to 87um, and the porosity increased from 35.5% to 42.4%, while the flexural strength increased from 19.92MPa to 25.18MPa. In addition, the porosity of SiC porous ceramics quickly decreased from 38.7% to 35.4% with sintering temperatures increasing from 1300¡æ to 1400¡æ, but the flexural strength of SiC porous ceramics had only a slight change, mainly standing at about 27MPa. Thus, the sintering temperature of SiC porous ceramics should be selected around the melting point of ceramic binder (1300¡æ).
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