生コークスを用いた炭素/セラミックス複合材料の製造(第8報) : C/SiC/B_4C複合材におけるβ-SiCの棒状粒成長と高靭化

概要

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Carbon-based composites with dispersed β-SiC and B_4C particles were prepared by normal pressure sintering. The spherical β-SiC particles with a diameter of 1 μm in the dense matrix of carbon grew into rods with a diameter of 3 to 5 μm and a length of up to 50 μm by heat-treatment above 2300℃. The anisotropic growth of SiC did not occur when the matrix contained less than one percent B_4C, but the anisotropic growth rate increased with increasing amount of B_4C. Dimensional change of the composites caused by the growth of SiC rods was less than 5 vol%. The composites were toughened by a crack deflection mechanism caused by SiC rods dispersion.
社団法人日本セラミックス協会の論文
1993-06-01