Journal of Materials Science

, Volume 43, Issue 12, pp 4099–4106 | Cite as

The effect of porosity in thermal shock

  • Chen Yuan
  • Luc J. Vandeperre
  • Robert J. Stearn
  • William J. CleggEmail author
Rees Rawlings Festschrift


The effects of porosity on cracking during thermal shock have been studied by directly observing the cracks that formed after quenching heated porous alumina bars into water. The porosity was introduced by adding different volume fractions of fugitive inclusions and the behaviour compared with that obtained by partial sintering of a powder compact. Where fugitive inclusions had been used, there was little effect of either pore size or pore volume fraction over the ranges studied. The extent of cracking was always slightly less than that of a monolithic, dense alumina and gave reasonable agreement with predictions using experimentally measured data. However, cracks grew much further in the partially sintered material. This discrepancy became greater as the temperature change increased, inconsistent with existing analyses. It is suggested that this difference in behaviour arises predominantly because of the greater measured fracture energy of the alumina made using fugitive inclusions compared with that made by partial sintering.


Fracture Energy Thermal Shock Young Modulus Potato Starch Thermal Shock Testing 



E. Carlström (I.V.F., Sweden) and A. Kristoffersson (Fiat, Sweden) for many helpful discussions.


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Chen Yuan
    • 1
    • 2
  • Luc J. Vandeperre
    • 1
    • 3
  • Robert J. Stearn
    • 1
  • William J. Clegg
    • 1
    Email author
  1. 1.Gordon Laboratory, Department of Materials Science and MetallurgyUniversity of CambridgeCambridgeUK
  2. 2.School of Engineering, Metallurgy and MaterialsUniversity of BirminghamBirminghamUK
  3. 3.Department of MaterialsImperial College LondonLondonUK

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