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- W2330730060 abstract "ジルコニア材料を高温で使用するとき, CaOが表面から選択的に蒸発して不安定化され, 表面に応力を生じる. これを明らかにする目的で, ZrO2-CaO (5-25mole%) 2成分系焼結体 (2,100℃) をタングステン炉の1,900°-2,100℃で7×10-5mmHgの真空中で加熱し, CaOの蒸発 (ZrO2は2,100℃で僅か蒸発) を自由蒸発法で測定した. 蒸発による重量減少速度は最初の20分で急激に低下してゆるやかになる. したがってこの方法では蒸気圧を正確に求めることはできなかった. 蒸発後の試料を研摩しながら, 表面のCaを蛍光X線分析により測定して濃度分布を求めた. 表面のCa濃度は時間とともに急激に減少し, 20-60μの深さまで分布が生ずる. 蒸発速度は早く, それが内部から表面へのCaの拡散速度に律速されることが判ったので, この濃度公布からCaの拡散係数を各初期濃度について求めDCa=0.0116exp[-(82,100-440c)/RT]cm2・sec-1を得た. cはCaOのmole%である." @default.
- W2330730060 created "2016-06-24" @default.
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- W2330730060 date "1971-01-01" @default.
- W2330730060 modified "2023-09-24" @default.
- W2330730060 title "Vaporization Process of CaO from CaO-stabilized Zirconia Body" @default.
- W2330730060 doi "https://doi.org/10.2109/jcersj1950.79.908_110" @default.
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