“ナノ強化” セラミックスの強度上昇機構に関する提言

• HOFFMAN Mark

  Ceramics Group, Department of Materials Science, Technical University Darmstadt Now School of Materials Science and Engineering, University of New South Wales

• RÖDEL Jürgen

  Ceramics Group, Department of Materials Science, Technical University Darmstadt

書誌事項

タイトル別名

• Suggestion for Mechanism of Strengthening of “Nanotoughened” Ceramics
• Suggestion for Mechanism of Strengtheni

抄録

This work seeks to explain the mechanism of the dramatic strength increase obtained by dispersing nanometer sized particles within a monolithic ceramic matrix relative to the pure matrix material. The crack tip toughness, along with long crack toughness of the material, is experimentally investigated, along with slow crack growth rates. A simple consideration of Griffith criteria shows that strength increases cannot be explained simply in terms of increased toughness. Additionally, critical crack sizes for fracture are considerably smaller than the grain size. It is proposed therefore that the inclusion of the nanoparticles changes the residual stress conditions within the material, hindering microcrack initiation in the stress field around a pore and reducing the facet length of such microcracks.

収録刊行物

• Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)

  Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) 105 (1228), 1086-1090, 1997

  公益社団法人 日本セラミックス協会

キーワード

• Ceramic
• Nanocomposite
• Alumina
• Strength
• Toughness
• Fracture
• Crack

詳細情報

• CRID: 1390282680256012672
• NII論文ID: 110002289271
• NII書誌ID: AN10040326
• DOI: 10.2109/jcersj.105.1086
• ISSN: 18821022
• ISSN: 09145400
• NDL書誌ID: 4354136
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4354136
• Web Site: http://www.jstage.jst.go.jp/article/jcersj1988/105/1228/105_1228_1086/_pdf
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