Cohesive Energy of Interfaces and Toughness of Fluorine-Doped Si<sub>3</sub>N<sub>4</sub>/SiC Composites
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- PEZZOTTI Giuseppe
- Department of Materials Science, Toyohashi University of Technology
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- KLEEBE Hans-Joachim
- Institut für Materialforschung, Universität Bayreuth
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- OTA Ken'ichi
- Institute of Scientific and Industrial Research, Osaka University
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- NISHIDA Toshihiko
- Department of Materials, Kyoto Institute of Technology
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- SAKAI Mototsugu
- Department of Materials Science, Toyohashi University of Technology
Bibliographic Information
- Other Title
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- フッ素含有Si<sub>3</sub>N<sub>4</sub>/SiC複合材の界面凝集エネルギーと靭性
- Cohesive Energy of Interfaces and Tough
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Abstract
Fracture mechanics and electron microscopy studies were systematically conducted on a dense Si3N4 material reinforced with high-aspect-ratio SiC platelets. This model system contained only an amorphous SiO2 phase at the multigrain pockets and along the internal interfaces. Two different procedures (and their empirical combination) were followed to gradually weaken the grain interfaces and, hence, deliberately change the fraction of intergranular fracture within the material upon crack propagation. These procedures were: 1) the gradual addition of a fluorine impurity, which remains segregated at the grain boundaries after sintering, and 2) the adoption of a “quenching” process under high pressure. Quantitative high-resolution and analytical electron microscopy provided fundamental insight into the internal structure of the intergranular SiO2 phase doped with fluorine and the corresponding microcracking processes. Quantitative fractography allowed to estimate the apparent cohesive energy of the internal interfaces of the composite and to relate it to the macroscopic material toughness.
Journal
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 104 (1205), 17-22, 1996
The Ceramic Society of Japan
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Details 詳細情報について
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- CRID
- 1390001205277103616
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- NII Article ID
- 110002291303
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- NII Book ID
- AN10040326
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- ISSN
- 18821022
- 09145400
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- NDL BIB ID
- 3917987
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed