Crack-healing behavior of Si3N4/SiC composite under stress and low oxygen pressure
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Abstract
The crack-healing behavior of Si3N4/SiC composite under constant stress and low oxygen partial pressure was investigated. A semi-elliptical surface crack with a length of about 100 μm was introduced at the center of the tensile surface by the indentation method. The specimens were crack-healed at 1200 °C for 5 h under tensile stress (σapp. = 200–300 MPa) and under low oxygen partial pressure and air (PO2=50–21 000 PaPO2=50–21 000 Pa). The threshold constant stress for crack-healing was defined as 200 MPa in oxygen partial pressure over 500 Pa. The bending strengths of crack-healed specimens under tensile stress in PO2≥500 PaPO2≥500 Pa showed almost the same value as a healed smooth specimen, and most specimens fractured outside the crack-healed zone. From these results, we conclude that crack-healing can be achieved under stress in low oxygen pressure and can lengthen lifetime and increase reliability in Si3N4/SiC composite ceramic.
Journal
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- Materials Science and Engineering: A
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Materials Science and Engineering: A 527 (15), 3343-3348, 2010-06-15
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Details 詳細情報について
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- CRID
- 1050564287692683136
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- NII Article ID
- 120005868337
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- NII Book ID
- AA10720420
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- ISSN
- 09215093
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- Web Site
- http://hdl.handle.net/10131/10394
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles
- KAKEN