Synthesis of Silicon Carbide Ceramics Using Chemically Modified Polycarbosilanes as a Compaction Binder |
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| Authors: | Yuichi Sawai Yuji Iwamoto Sachiko Okuzaki Yoshiyuki Yasutomi Koichi Kikuta Shin-ichi Hirano |
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| Affiliation: | Synergy Ceramics Laboratory, Fine Ceramics Research Association, Nagoya 456-8587, Japan;Department of Energy Devices, Hitachi Research Laboratory, Hitachi, Ltd., Tokyo 319-1292, Japan;Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan |
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| Abstract: | A chemically modified polycarbosilane (PC) containing organofluoric groups (PCOCF) has been synthesized from PC and fluoroalkylmethyldimethoxysilane. PCOCF acts as an efficient compaction binder for SiC powders and as a coating material with excellent oxidation resistance in wet air. PCOCF-coated SiC powders also show excellent packing properties because of the organofluoric side chains, which give highly dense green compacts. PCOCF provides a high ceramic yield of 75% and highly dense SiC ceramics. Four-point bending strength increases and the scatter in strength values decreases significantly by PCOCF coating. |
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