炭化チタンウイスカー/アルミナ系複合セラミックスの酸化挙動

概要

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Oxidation behavior of an alumina composite containing 30 vol% TiC whiskers has been studied at 800, 900 and 1000℃ in air. Only rutile-type TiO_2 in addition to TiC and Al_2O_3 was observed after oxidation. The weight gain curve obeyed the parabolic law at each oxidation temperature, indicating that the oxidation was controlled by diffusion of oxygen in the matrix. An apparent activation energy for oxidation of this composite was around 127 kJ/mol. The bending strength of the oxidized composite decreased gradually with oxidation time at any temperature. This can be explained by the following fact; the thickness of the oxidized layer and the size of oxidized grains increased with increase in oxidation temperature and time. A roughly linear relationship was observed between the thickness of oxidized layer and the weight gain.
社団法人日本セラミックス協会の論文
1997-06-01