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Thermal Shock Behavior of Open Cell Ceramic Foams

  • Robert M. Orenstein (a1), David J. Green (a2) and Albert E. Segall (a3)
Abstract
Abstract

Specimens of heated alumina foams were thermally shocked by immersion in water or oil. Two distinct temperature profiles were found to exist during liquid quenching: a macroscopic gradient due to heating of the fluid during infiltration into the foam and a microscopic gradient across each individual strut. Thermal stresses were calculated using a semi-empirical, finite element model. The peak thermal stresses were coupled with the two-parameter Weibull distribution of the strut strengths to calculate the probability of crack extension on a strut for eight cellular geometries. Experimentally, the thermal shock resistance increased with increasing relative density and increasing cell size. The predicted critical temperature differences were in fair agreement with measured values.

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References
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1. Ashby M.F., Metall. Trans. A, 14A, 1755–69 (1983).
2. Ziegler G., Z. Werkstofftech., 16, 1218 (1985).
3. Orenstein R.M., Thermal Shock Behavior of Open Cell Ceramic Foams, MS Thesis, The Pennsylvania State University, May 1990.
4. Stanley P., Fessler H. and Sivill D., Proc. Br. Ceram. Soc., 22, 453–87 (1973).
5. Orenstein R.M. and Green D.J. in Proc. of the 3rd Int. Symoosium on Ceramic Materials and Components for Engines, Edited by Tennery V.J. (Am. Ceram. Soc. Proceedings, Westerville, OH 1989) pp. 641650.
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MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
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