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Using two types of commercial Si-C-O fibers (Nicalon NL400 and NL200 produced by Nippon Carbon Co.), the pyrolysis mechanism of the fibers has been studied. The pyrolytic rate has been measured with a thermobalance in an argon atmosphere for 64.8ks at temperatures from 1473K to 1673K. The pyrolytic rate was strongly dependent on temperature. NL400 with the higher concentration of oxygen, in which the atomic arrangement was highly disordered, decomposed to β-SiC rapidly. Most of SiO evolved at the early stage of the pyrolysis, whereas CO continued to evolve constantly before the completion of the pyrolysis. The initial degradation in the tensile strength of the fiber was followed by a slower decrease. The pyrolytic rate was described by the Avrami-Erofeev equation. It is considered that the pyrolysis is controlled by the nucleation and growth of β-SiC crystallites.

Pyrolysis of Si-C-O Fibers (Nicalon) at Temperatures from 1473K to 1673K