Migration of Grain Boundary Phases of AlN Ceramics in Joined Sample of Sintered and Hot-pressed Body

Takeshi YAGI; Kazuo SHINOZAKI; Masanori KATO; Yutaka SAWADA; Nobuyasu MIZUTANI

doi:10.2109/jcersj.98.198

Takeshi YAGI, Kazuo SHINOZAKI, Masanori KATO, Yutaka SAWADA, Nobuyasu MIZUTANI

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Keywords: AlN ceramics, Grain boundary phase, Grain boundary migration

JOURNAL FREE ACCESS

1990 Volume 98 Issue 1134 Pages 198-203

DOI https://doi.org/10.2109/jcersj.98.198

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Abstract

Hot-pressed AlN body without additive and sintered AlN body containing 10wt% Y₂O₃ were joined by hot-pressing under a pressure of 200kg/cm² at 1800°C for 10min. The joined samples with the step-like concentration gradient of grain boundary phases were annealed at 1900°C for 0, 0.5, 1 and 3hrs in N₂ 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 in the hot-pressed body.

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