接合試料におけるAlN焼結体粒界相の移動現象

概要

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Hot-pressed AIN body without additive and sintered AIN body containing 10 wt% Y_2O_3 were joined by hot-pressing under a pressure of 200 kg/cm^2 at 1800℃ for 10 min. The joined samples with the step-like concentration gradient of grain boundary phases were annealed at 1900℃ for 0, 0.5, 1 and 3 hrs in N_2 using carbon container. The initial migration of grain boundary phases from sintered to hot-pressed body was caused by their concentration gradient. Grain boundary phases transferred to the surface were decomposed and nitrided. After the concentration gradient disappeared, the surface reaction caused the migration of grain boundary phases. The grain boundary phases reacted with oxygen in the hot-pressed body, resulting in the depletion of oxygen the hot-pressed body.
社団法人日本セラミックス協会の論文
1990-02-01