Transformation of tetragonal zirconia polycrystals by annealing under humidity controlled conditions.
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- SATO Tsugio
- Faculty of Engineering, Tohoku University
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- OHTAKI Shiro
- Faculty of Engineering, Tohoku University
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- ENDO Tadashi
- Faculty of Engineering, Tohoku University
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- SHIMADA Masahiko
- Faculty of Engineering, Tohoku University
Bibliographic Information
- Other Title
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- 正方晶安定化ジルコニアの水蒸気雰囲気アニールの相転移
- セイホウショウ アンテイカ ジルコニア ノ スイジョウキ フンイキ アニール
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Abstract
Changes in the crystalline phase and microstructure on the surface resulting from low-temperature annealing of tetragonal zirconia polycrystals doped 2, 3 and 4 mol% Y2O3 were investigated under humidity controlled conditions at 0-7.35kPa of water vapor pressure and 100-600°C for 1-50hr. The tetragonal phase ZrO2 transformed to the monoclinic structure by annealing at low temperature conditions such as 100-500°C. The phase transformation caused microcracks on the surface and resulted in significant loss of fracture strength. The critical temperatures of the phase transformation of ZrO2-2 mol% Y2O3, ZrO2-3 mol% Y2O3 and ZrO2-4 mol% Y2O3 were 500, 400 and 350°C, respectively. The phase transformation proceeded rapidly on the surface but quite slowly inside the body. The rate of the phase transformation on the surface was first order with respect to the concentration of the tetragonal ZrO2 and increased with increasing water vapor pressure by Langmuir type relation. The appearent activation energy of the phase transformation was about 85kJ/mol.
Journal
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- Journal of the Society of Materials Science, Japan
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Journal of the Society of Materials Science, Japan 36 (400), 7-11, 1987
The Society of Materials Science, Japan
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Details 詳細情報について
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- CRID
- 1390282680369872384
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- NII Article ID
- 110002296986
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- NII Book ID
- AN00096175
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- ISSN
- 18807488
- 05145163
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- NDL BIB ID
- 3119050
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed