酸化物/炭化ケイ素ウイスカー複合材料の酸化挙動

概要

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Oxidation test of SiC whisker (SiC (w) ) itself and four composites of Al_2O_3, Y-TZP, 3Al_2O_3・2SiO_2 and ZrO_2・SiO_2 matrices reinforced with SiC(w) was carried out in the temperature range from 800° to 1200℃. SiC(w) oxidized at higher than 800℃, and it was almost completely converted into SiO_2 by oxidation at 1300℃ for 100 h. Oxidation of SiC(w) in the oxide matrices became heavier in the order, 3Al_2O_3・2SiO_2, Al_2O_3, ZrO_2・SiO_2, Y-TZP, and was thought to be controlled by diffusion (of oxygen in matrices) step. Although the reaction between oxide matrices and SiO_2 formed by oxidation of SiC(w) was observed, the effect of this reaction on the oxidation of SiC (w) in oxide matrices was not clarified in this work. Degradation of strength was caused by oxidation of SiC(w). The oxide materials which have low oxygen diffusibility at high temperatures should be selected as the matrices for oxide composites with SiC(w).
社団法人日本セラミックス協会の論文
1991-07-01