ホットプレスSi_3N_4-SiC複合焼結体の酸化挙動

概要

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The Si_3N_4-SiC composites which is composed of Si_3N_4 matrix doped with 2 wt% Al_2O_3 and 5 wt% Y_2O_3 and 50 wt% SiC powder having a different mean particle sizes, were fabricated by hot-pressing. Their oxidation behavior was investigated and compared with the commercial Si_3N_4 sintered material. An oxidation test was carried out in an electric furnace at 1300℃ for 100 hours. The measurement of bending strength, weight gain, surface roughness and microscopic observation of sintered materials were carried out after oxidation. Weight gain of the Si_3N_4-SiC composite was lower than that of the commercial Si_3N_4 sintered material. The crystalline phases of sintered materials after oxidation test were β-Si3_N_4, α-Si0_2, Y_2O_3・2SiO_2 and SiC. The bending strength of Si_3N_4-SiO_2 composites slightly increased the value after oxidation.
社団法人日本セラミックス協会の論文
1990-02-01