反応焼結SiC基長繊維複合材料中の劣化SiC繊維の微構造

概要

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Some of the SiC fibers (Hi-Nicalon^<TM>) embedded in reaction-bonded SiC matrix composites were found to be altered during the reaction sintering process. The microstructures of the altered fibers were investigated using transmission electron microscopy. The altered fibers consisted of coarse SiC and carbon grains. On the other hand, undamaged fibers consisted of fine SiC grains with amorphous carbon between the SiC grains. In the carbon grains of the altered fibers, concentric lattice fringes were visible, and crystallinity was raised compared to the amorphous carbon of the undamaged fibers. The alteration of fibers was probably caused by liquid Si which infiltrated into the powder preforms during reaction sintering. It is thought that the coarsening of the SiC grains ocuurred through a solution-reprecipitation mechanism and that the change in the carbon phase was promoted by the catalytic graphitization of Si.
社団法人日本セラミックス協会の論文
2000-06-01