Fabrication of Open-Cell, Microcellular Silicon Carbide Ceramics by Carbothermal Reduction |
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| Authors: | Young-Wook Kim Shin-Han Kim In-Hyuck Song Hai-Doo Kim Chul B. Park |
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| Affiliation: | Department of Materials Science and Engineering, The University of Seoul, Seoul 130-743, Korea; Ceramic Materials Group, Korea Institute of Machinery and Materials, Changwon, Gyeongnam 641-010, Korea; Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, Canada M5S 3G8 |
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| Abstract: | A novel processing route for developing open-cell, microcellular SiC ceramics has been developed. The strategy adopted for making microcellular SiC ceramics involved the following: (i) fabricating a formed body from a mixture of polysiloxane, phenol resin (used as a carbon source), polymer microbeads (used as sacrificial templates), and Al2O3–Y2O3 (an optional sintering additive); (ii) cross-linking the polysiloxane in the formed body; (iii) transforming the polysiloxane and phenol resin by pyrolysis into silicon oxycarbide and C, respectively; and (iv) synthesizing SiC by carbothermal reduction. By controlling the microbead and additive contents, it was possible to adjust the porosity so that it ranged from 60% to 95%. |
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