Gas Permeability of Oxide Ceramics at Ultra-High Temperatures
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- MATSUDAIRA Tsuneaki
- Japan Fine Ceramics Center
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- WADA Masashi
- Japan Fine Ceramics Center
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- KITAOKA Satoshi
- Japan Fine Ceramics Center
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- ASAI Tsutomu
- Electric Power Res. & Development Center, Chubu Electric Power Co., Inc.
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- MIYACHI Yoshikazu
- Electric Power Res. & Development Center, Chubu Electric Power Co., Inc.
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- KAGIYA Yukio
- Electric Power Res. & Development Center, Chubu Electric Power Co., Inc.
Bibliographic Information
- Other Title
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- 超高温環境下における酸化物セラミックスのガス透過特性
- チョウコウオン カンキョウカ ニ オケル サンカブツ セラミックス ノ ガス トウカ トクセイ
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Abstract
To evaluate the capability of candidate materials such as alumina (Al2O3) and yttria stabilized zirconia (YSZ) ceramics for use as environmental barrier coatings (EBCs) on C/C composites, the oxygen and water permeability through each oxide ceramic were measured in dry and/or wet atmospheres at ultra-high temperatures. The oxygen permeability constant of Al2O3 was much smaller than that of YSZ, and was found to be in good agreement with previous values. The surface morphology of Al2O3 after the test displayed significant dependence on the oxygen potential gradients during the test. Deep grain boundary grooves were formed on those surfaces exposed to lower Po2 ; however, on the opposite surface under a higher Po2, the grain boundaries rose, forming ridges. The dependence of the Al2O3 oxygen permeability constant on the Po2 in the testing environment displayed p-type semiconductivity. Therefore, the unique morphological change may be related to the migration of aluminum ions from the lower to the higher Po2 side by the substitution of cation vacancies that segregate at the grain boundaries. The water permeability constant of Al2O3 was under the detection limit (10-10mol/(m·s) at the temperature of 1923K.
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 57 (6), 532-538, 2008
The Society of Materials Science, Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001205419769856
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- NII Article ID
- 130002085636
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- NII Book ID
- AN00096175
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- ISSN
- 18807488
- 05145163
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- NDL BIB ID
- 9546705
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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