| Processing of Cellular SiC Ceramics Using Polymer Microbeads |
| Sung-Hee Lee, Young-Wook Kim |
| Department of Materials Science and Engineering, the University of Seoul |
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| ABSTRACT |
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A simple pressing process using a SiC powder, $Al_2O_3-Y_2O_3$ sintering additive, and polymer microbeads for fabricating cellular SiC ceramics is demonstrated. The strategy for making the cellular ceramics involves: (i) forming certain shapes using a mixture of a SiC powder, $Al_2O_3-Y_2O_3$ sintering additive, and polymer microbeads by pressing; (ii) heat-treatment of the formed body to burn-out the microbeads; and (iii) sintering the body. By controlling the microsphere content and sintering temperature, it was possible to adjust the porosity in a range of 16% to 69%. The flexural and compressive strengths of cellular SiC ceramics with $sim$40% porosity were $sim$60 MPa and $sim$160 MPa, respectively. |
| Key words:
Porous ceramics, Microbead, Porosity, Flexural strength, Compressive strength |
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