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Structural evolutions from polycarbosilane to SiC ceramic

Research paper by G. D. Soraru, Florence Babonneau, J. D. Mackenzie

Indexed on: 01 Sep '90Published on: 01 Sep '90Published in: Journal of Materials Science



Abstract

The pyrolysis process of a polycarbosilane into a microcrystalline silicon carbide ceramic has been followed up to 1700 ° C mainly by means of solid state29Si and13C nuclear magnetic resonance, transmission electron microscopy and X-ray diffraction analysis. A structural model has been proposed for the amorphous silicon carbide phase that is formed during the pyrolysis process. The ceramic obtained at high temperature is formed by a mixture of β-SiC and α-SiC; however, some difficulties in the identification of the crystalline phases have been pointed out.