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- 上垣外 修己
- (株)豊田中央研究所
書誌事項
- タイトル別名
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- Temperature Dependence of Fracture Toughness of Ceramics.
- セラミックス ニ オケル ハカイジンセイ ノ オンド イソンセイ
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説明
Compairing the literature values of fracture toughness of various materials revealed that the value of the same kind of material scatters largely, depending on the authors or measuring ways, but that the temperature dependence is very small and almost common, particularly in the range RT through 1, 200 °C, for most ceramics in spite of the large scattering in the absolute value. The temperature coefficient, (-(dKIc/dT)/KIc(RT)), is(-2. 1-1.6)10-5/K for SiC ceramics, and(0-1.3)10-4/K for Si3N4. The unexpectedly small temperature dependence was explained on the basis of the dependence of the surface free energy, rs.which was found to be approximated by the empirical formular (-(dγs/dT)/γso = 1/(2.1Tm) ; Tm is melting or sublimation point ) and that of Young's modulus, E. On this basis, the value of KIc at 1, 600 °C is expected not to be less than 70% of the value at RT, if the material is not affected by low heat resistant boundary material. Furthermore, the literature values are found to be 2 to 6 times larger than the ideal value calculated from (2γsE)1/2. This large value is related to the generation of rough fractured surface.
収録刊行物
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- 粉体および粉末冶金
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粉体および粉末冶金 39 (8), 624-629, 1992
一般社団法人 粉体粉末冶金協会
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詳細情報 詳細情報について
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- CRID
- 1390001206305908224
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- NII論文ID
- 130000818238
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- NII書誌ID
- AN00222724
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- COI
- 1:CAS:528:DyaK3sXhtVCqug%3D%3D
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- ISSN
- 18809014
- 05328799
- http://id.crossref.org/issn/05328799
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- NDL書誌ID
- 3784306
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可