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The Effect of Polyvinyl Alcohol on the Microstructure and Permeability of Freeze-Cast Alumina

Authors

  • Christopher Peko,

    Corresponding author
    1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
      †Author to whom correspondence should be addressed. e-mail: cmpst45@pitt.edu
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    • *Member, The American Ceramics Society.

  • Ben Groth,

    1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
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    • *Member, The American Ceramics Society.

  • Ian Nettleship

    1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
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    • *Member, The American Ceramics Society.


  • G. Franks—contributing editor

  • The authors would like to thank the National Science Foundation (NSF) for the financial support of the work under grant number 0404874.

†Author to whom correspondence should be addressed. e-mail: cmpst45@pitt.edu

Abstract

This study examined the effect of polyvinyl alcohol (PVA) on the microstructure and permeability of freeze-cast porous alumina. The PVA addition was shown to have a significant effect on the pore size, with the trends in microstructure morphology and scale being qualitatively consistent with the effects of PVA addition on constitutional supercooling. The measured Darcian permeabilities were between 10−10 m2 and 10−12 m2. The permeability decreased as the PVA content increased and a significant fraction of the flow could be attributed to inertial effects.

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