N_2雰囲気下における低酸素SiC繊維の高温熱分解

概要

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The pyrolysis of a low-oxygen SiC fiber, prepared by the electron irradiation curing method, has been investigated in N2 atmosphere at temperatures from 1673 to 1973 K. Then, the pyrolyiic behavior in N_2 was compared with that in Ar. The fiber absorbed a considerable amount of nitrogen, and consequently, the mass loss caused by the pyrolysis was compensated. While the nitrided layer retarded the crystallization into β-SiC below 1773 K, this effect disappeared above 1873 K. As a result of the reaction of SiO with carbon, coarse SiC particles grew on the surface of the fiber heat treated at 1973 K. The tensile strength of the fiber was illversely proportional to the square root of the SiC crystal size. For SiC crystals with the same size, the strength was much higher in N_2 than in Ar, because of smoothness of the surface.
社団法人日本セラミックス協会の論文
1994-12-01