Nicalon fibers, formation

The presence of amorphous oxycarbide (Si-O-C) phase was also revealed in the Nicalon fibers at the interface between SiC core and surface SiOa layer (Pumpuck, 1980 Lipowitz, 1987 Laffon, 1989 Porte, 1989), although any thermodynamically stable compounds have not been found in the Si-O-C system. The formation of such an amorphous silicon oxycarbide phase was also suggested during the pyrolysis of organics-substituted polysiloxane gels to form SiC (Zhang, 1990 Babonneau, 1990 Bums, 1992). 

The fabrication of glass or glass ceramic matrices by hot pressing is outlined at moderate temperatures and pressures, but they are sufficiently high to cause formation of interphases between SiC-fibers - namely NICALON and TYRANNO - their coatings and the matrix. Formation of very complex... 

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