Improvement of Oxidation Resistance and Oxidation-Induced Embrittlement by Controlling Grain Boundary Microstructure in Silicon Carbides with Different Dopants
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- Tsurekawa Sadahiro
- Laboratory of Materials Design and Interface Engineering, Department of Nanomechanics, Graduate School of Engineering, Tohoku University
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- Watanabe Hiroaki
- Laboratory of Materials Design and Interface Engineering, Department of Nanomechanics, Graduate School of Engineering, Tohoku University
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- Tamari Nobuyuki
- Kansai Center, National Institute of Advanced Industrial Science and Technology
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- Watanabe Tadao
- Laboratory of Materials Design and Interface Engineering, Department of Nanomechanics, Graduate School of Engineering, Tohoku University
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High temperature oxidation and oxidation-induced embrittlement in β-silicon carbides (SiCs) with different grain boundary microstructures have been studied. SiCs with different grain boundary microstructures were fabricated by hot-pressing with different doping elements like Mg, Al, P. Oxidation experiments were carried out under the oxygen partial pressure ranging from 0.303 Pa to 78.5 Pa at temperatures 1623—1773 K for 7.2—36 ks. Thereafter, the degree of oxidation-induced embrittlement was quantitatively evaluated by three-point bend tests at room temperature in connection with grain boundary microstructure. More severe degradation was observed as a result of oxidation though the passive oxidation took place. It is concluded that the oxidation-induced embrittlement in β-SiC can be improved by decreasing the frequency of random boundaries and the grain size. The potential of grain boundary engineering for a ceramic material has been confirmed.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 45 (7), 2128-2136, 2004
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679228147072
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- NII論文ID
- 10013336791
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- NII書誌ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BD2cXmvFejsLs%3D
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 7015813
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可