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Synthesis of Silicon Carbide Ceramics Using Chemically Modified Polycarbosilanes as a Compaction Binder
Authors:Yuichi Sawai   Yuji Iwamoto   Sachiko Okuzaki   Yoshiyuki Yasutomi   Koichi Kikuta   Shin-ichi Hirano
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
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.
Keywords:
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