N_2雰囲気におけるSiO_2-TiO_2-C系前駆体繊維の焼成

概要

論文の詳細を見る
A SiO_2-TiO_2-C precursor fiber, which was prepared from phenolic resin fiber (Kynol) impregnated with a mixed solution of ethylsilicate and titanium tetraisopropoxide, was heat-treated in N_2 at 1873 K. The heat-treated fiber was examined by X-ray diffraction, SEM observation and chemical analysis, and compared with the fiber heat-treated in Ar. The heat treatment produced carbon fiber coated with a mixture of SiC and Ti(C, N). The solid-solubility of carbon in TiN increased with increasing carbon content in the precursor fiber. Carbothermal reduction and nitridation of TiO_2 to Ti(C, N) preceded carbothermal reduction of SiO_2 to SiC. While the fiber heat-treated in Ar was roughened by coarsening of the carbide crystals, the fiber heat-treated in N_2 was uniform and smooth in appearance. However, on heat treating the precursor fiber with a high concentration of SiO_2 and a low concentration of TiO_2, the hexagonal crystals of Si_3N_4 grew coarsely on the smooth surface.
社団法人日本セラミックス協会の論文
1995-07-01