Creep and stress rupture behavior of an advanced silicon nitride; Part 2: Creep rate behavior

In Part 1 of this paper, experimental observations on creep testing of 74 tensile specimens of an advanced silicon nitride were presented. In this part, equations are developed for predicting creep rates in the primary and secondary regimes in the temperature range 1,477--1,673 K. The resulting mode...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1994-05, Vol.77:5
Main Authors: Menon, M.N., Fang, H.T., Wu, D.C., Jenkins, M.G., Ferber, M.K.
Format: Article
Language:English
Subjects:
360203 - Ceramics, Cermets, & Refractories- Mechanical Properties
ACTIVATION ENERGY
CREEP
ENERGY
MATERIALS SCIENCE
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SILICON NITRIDES
STRAIN RATE
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Summary:In Part 1 of this paper, experimental observations on creep testing of 74 tensile specimens of an advanced silicon nitride were presented. In this part, equations are developed for predicting creep rates in the primary and secondary regimes in the temperature range 1,477--1,673 K. The resulting model predicts creep strain rates to within a factor of two. The underlying phenomenological basis, which employs an activation energy approach, is discussed. The mechanisms that are likely to be responsible for the transiency of the primary creep regime and for the unique stress and temperature dependencies of the creep rates are explored.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1994.tb05396.x