ポリカルボシラン/樹脂/バインダー混合系から作製したSiC/C複合シート

概要

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Green sheets were made from polycarbosilane (PCS), phenol-formaldehyde resin or furfuryl alcohol resin by adding binder with the weight ratio of PCS to resin equal to 2/1 or 1/1. The two types of green sheets were heat-treated at 1200° to 1400℃ under N_2 gas to form SiC/C composite sheets 0.4-0.6 mm thick. The SiC/C composite sheets were highly amorphous, that is, the crystallite sizes of L_<111> and L_c of SiC and C components in the SiC/C composites were below 34Å and 25Å, respectively. As another feature, it was recognized that amorphous SiO_2 was formed as a secondary product by the reaction of silicon in PCS and oxygen in resin during pyrolysis. Little difference was observed in bending strength and oxidation resistance between two SiC/C composite sheets. These features depend on the content of SiC in the composite sheet. The effective mixing ratio is PCS/resin≧2/1.
社団法人日本セラミックス協会の論文
1992-02-01