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Creep Cavitation and Crack Growth in Silicon Nitride

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Deformation of Ceramic Materials II

Part of the book series: Materials Science Research ((MSR,volume 18))

Abstract

Cavities and microcracks occur in hot-pressed MgO doped and Y2O3 doped Si3N4 during high temperature creep. Specimens selected from static load experiments at 1200°C and 1300°C were examined by transmission electron microscopy. In the MgO doped Si3N4 an amorphous MgO · SiO2 phase, which bonded the grains, softened and cavitated readily at 1200°C leading to a creep exponent of 4.2. In the Y2O3 doped Si3N4 a crystalline yttrium-silica-oxynitride phase bonded the Si3N4 grains. Cavitation started at the triple junctions where these phases were present. Crack-like cavities also started at triple junctions and grew between the Si3N4 grains. The nucleation and growth stages of creep cavitation in both materials are related to failure mechanisms.

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Authors and Affiliations

  1. Inorganic Materials Division, National Bureau of Standards, Washington, DC, 20234, USA

    N. J. Tighe, S. M. Wiederhorn, T.-J. Chuang & C. L. McDaniel

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  1. N. J. Tighe
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  2. S. M. Wiederhorn
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  3. T.-J. Chuang
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  4. C. L. McDaniel
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Editor information

Editors and Affiliations

  1. The Pennsylvania State University, University Park, Pennsylvania, USA

    Richard E. Tressler (Professor and Chairman of Ceramic Science and Engineering) (Professor and Chairman of Ceramic Science and Engineering)

  2. University of Washington, Seattle, Washington, USA

    Richard C. Bradt (Professor of Materials Science and Engineering) (Professor of Materials Science and Engineering)

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© 1984 Plenum Press, New York

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Tighe, N.J., Wiederhorn, S.M., Chuang, TJ., McDaniel, C.L. (1984). Creep Cavitation and Crack Growth in Silicon Nitride. In: Tressler, R.E., Bradt, R.C. (eds) Deformation of Ceramic Materials II. Materials Science Research, vol 18. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-6802-5_39

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  • DOI: https://doi.org/10.1007/978-1-4615-6802-5_39

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4615-6804-9

  • Online ISBN: 978-1-4615-6802-5

  • eBook Packages: Springer Book Archive

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