Influence Factors on the Porosity and Strength of SiC Porous Ceramic

doi:10.3724/SP.J.1077.2011.00944

Abstract

Abstract: 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℃ to 1400℃, 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℃).

Key words: SiC porous ceramics, filtration, flexural strength, porosity

CLC Number:

TQ174

LI Jun-Feng, LIN Hong, LI Jian-Bao. Influence Factors on the Porosity and Strength of SiC Porous Ceramic[J]. Journal of Inorganic Materials, 2011, 26(9): 944-948.

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