β"アルミナ焼結体の機械的特性及びイオン導電率

概要

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Strength of β"-alumina at elevated temperature was evaluated and the results compared with its other mechanical properties and ionic conductivity in order to discuss the temperature dependence behavior. There is a rapid decrease of strength until 200℃, indicating 60% of initial strength value. Beyond 200℃, the decrease ratio becomes small. This trend is similar to the toughness variation against temperature. It is considered that the strength degradation would be due to the decrease of effective fracture energy because the variation of effective fracture energy with increasing temperature was larger than that of Young's modulus. The degradation of strength with increasing temperature corresponded to the increasing of ionic conductivity whose dependence on temperature varied at approximately 250℃. The strength decreases due to the decrease of binding force of conduction plane and the increase of ionic conductivity due to motion of the sodium ion because the mobility of the vacancy increases with increasing temperature up to 250℃.
社団法人日本セラミックス協会の論文
2004-05-01