各種粒径の Y 添加正方晶 ZrO_2 多結晶体における酸素拡散

概要

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The oxygen diffusion coefficient in Y2O3-containing tetragonal ZrO2 polycrystals (Y-TZP, 2.75mol%Y2O3) was determined over the temperature range (600° to 800°C) by monitoring diffusion process with a microbalance. Oxygen isotope (18O) was used as a tracer. The same diffusion coefficient was obtained for specimens with different grain sizes, indicating that there was no fast diffusion along the grain boundaries in Y-TZP. The oxygen lattice diffusion was faster in Y-TZP than t-ZrO2 doped with 14% CeO2. This suggested that most cerium atoms in t-ZrO2 doped with CeO2 were in 4+ rather than 3+. The oxygen lattice diffusion coefficient in Y-TZP was almost the same as that in Ca-stabilized cubic ZrO2, but was several orders of magnitude higher than that in m-ZrO2 doped with 1-2% Y2O3.
社団法人日本セラミックス協会の論文
1991-01-01