Ceramics-Silikáty 58, (4) 326 - 332 (2014) |
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EFFECT OF SiC PARTICLE SIZE ON THE MATERIAL AND MECHANICAL PROPERTIES OF MULLITE BONDED SiC CERAMICS PROCESSED BY INFILTRATION TECHNIQUE
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Baitalik Sanchita, Kayal Nijhuma, Dey Atanu,
Chakrabarti Omprakash
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Central Glass and Ceramic Research Institute, CSIR, 196, Raja S. C. Mullick Road, Kolkata-700 032, India
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Keywords: Particle size, Mullite bond, Infiltration, Porous SiC, Microstructure
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The influence of SiC particles size on the bonding phase content, microstructure, SiC oxidation degree, flexural strength,
porosity and pore size distribution of mullitebonded porous SiC ceramics were studied and compared with oxidebonded
porous SiC ceramics. The SEM morphologies and EDS elemental analysis results showed the presence of needle shaped
crystals of mullite and fish scaled cristobalite in the bond phase. It was found that increase of SiC particle size effectively
enhanced the porosity and decreased the strength. The porosity decreased as the size of SiC particles decreased from 36 vol. %
at 99 μm to 25 vol. % at 4.47 μm. The oxidation degree of SiC was found to be reduced by infiltration of mullite precursor
sol and enhanced with sintering temperature. Bimodal pore size distributions were obtained for mullite-bonded porous SiC
ceramics and the average pore diameter varied in the range of 2 - 30 μm with variation of particle size. |
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