Processing of closed-cell silicon oxycarbide foams from a preceramic polymer |
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| Authors: | Young-Wook Kim Shin-Han Kim Hai-Doo Kim Chul B Park |
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| Affiliation: | (1) Department of Materials Science and Engineering, The University of Seoul, 90 Jeonnong-dong, Dongdaemoon-ku, Seoul, 130-743, Korea;(2) Ceramic Materials Group, Korea Institute of Machinery and Materials, Chang-Won, Kyung-Nam, 641-010, Korea;(3) Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada, M5S 3G8 |
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| Abstract: | A novel processing route for fabricating closed-cell ceramic foams has been developed. The strategy for making the ceramic foams involves: (i) forming some shapes using a mixture of preceramic polymer and expandable microspheres by a conventional ceramic forming method, (ii) foaming the compact by heating, (iii) cross-linking the foamed body, and (iv) transforming the foamed body into ceramic foams by pyrolysis. By controlling the microsphere content and the pyrolysis temperature, it was possible to adjust the porosity ranging from 56 to 85%. |
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