ジルコニアセラミックスの水中アニールによる相転移

概要

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The tetragonal-to-monoclinic phase transformation of Y_2O_3-doped tetragonal ZrO_2 polycrystals(Y-TZP)was investigated by annealing at 140°C in hot water. Sintered bodies of Y-TZP were prepared by sintering at temperatures ranging between 1300 and 1500°C, using a 3mol% Y-TZP fine powder, synthesized by means of the hydrolysis method, as a starting powder. X-ray diffraction measurements on the sample surfaces and Rietveld analyses revealed that the amount of cubic phase increased and the Y_2O_3 concentration within the tetragonal phase decreased as the sintering temperature increased. Scanning electron microscopy measurements also showed that the grain size on the sample surfaces increased as the sintering temperature increased. When the sintered bodies were subjected to annealing in hot water, the phase-transformation rate on their surfaces increased as the sintering temperature increased. This behavior can be explained by both the decrease in the Y_2O_3 concentration within the tetragonal phase and the increase in the grain size.
社団法人日本セラミックス協会の論文
1999-02-01