前駆体法によるC-SiC-TiC系複合繊維の合成

概要

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A C-SiC-TiC composite fiber was obtained by heating a C-SiO_2-TiO_2 precursor, which was prepared from the carbon fiber (Kynol) impregnated with a mixed solution of ethylsilicate and titanium tetraisopropoxide. The reduction mechanism of the precursor has been investigated. The reduction rate was determined by means of a thermobalance in an atmosphere of Ar at temperatures from 1673 to 1973 K. The reaction products were examined by X-ray diffraction, SEM observation and chemical analysis. The precursor hydrolyzed in air was uniform and smooth in appearance, and had a microstructure of intermixed amorphous silica, anatase and carbon. The reduction of TiO_2 preceded that of SiO_2. Ti_3O_5 and Ti_2O_3 were transiently formed until TiO_2 was fully reduced to TiC. The atomic ratio of Ti to C in titanium carbide was smaller than unity. The reduction products of SiO_2 were SiC and SiO. The carbon core was surrounded by the reduction layer, in which the crystals of SiC and TiC were finely mixed. The reaction mechanism of the precursor changed with reduction time.
社団法人日本セラミックス協会の論文
1995-04-01