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Freeze-Cast Alumina Pore Networks: Effects of Processing Parameters in Steady-State Solidification Regimes of Aqueous Slurries

Miller, S. M. and Xiao, X. and Setlock, J. A. and Faber, K. T. (2018) Freeze-Cast Alumina Pore Networks: Effects of Processing Parameters in Steady-State Solidification Regimes of Aqueous Slurries. Journal of the European Ceramic Society, 38 (15). pp. 5134-5143. ISSN 0955-2219 . http://resolver.caltech.edu/CaltechAUTHORS:20180713-131315182

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Abstract

Aqueous alumina slurries with varying solids loading and particle size were freeze-cast under seven freezing conditions to investigate the influence of these on pore network characteristics including pore size and geometric specific surface area. Slurry temperatures were recorded in situ to determine freezing front position and velocity during solidification, which were then analyzed via regression and modeled using solidification theory. Classic mathematical models for the time dependence of freezing front position and velocity were found to hold for freeze-cast slurries. Building on these, a one-phase Stefan problem was used to describe freezing kinetics. Models for freezing front velocity were combined with solidification theory to obtain predictions of microstructural feature size from freezing kinetics. Results showed that, while there may be a dependence on solids loading, the combination of mathematical modeling of solidification and classic solidification theory is applicable to freeze-cast ceramics and accurately describes pore network characteristics from processing parameters.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.jeurceramsoc.2018.07.009DOIArticle
ORCID:
AuthorORCID
Faber, K. T.0000-0001-6585-2536
Additional Information:© 2018 Elsevier Ltd. Received 16 May 2018, Revised 6 July 2018, Accepted 8 July 2018, Available online 10 July 2018.
Subject Keywords:Freeze casting; Porous ceramics; Directional solidification; X-ray computed tomography; Stefan problem
Record Number:CaltechAUTHORS:20180713-131315182
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180713-131315182
Official Citation:S.M. Miller, X. Xiao, J.A. Setlock, K.T. Faber, Freeze-cast alumina pore networks: Effects of processing parameters in steady-state solidification regimes of aqueous slurries, Journal of the European Ceramic Society, Volume 38, Issue 15, 2018, Pages 5134-5143, ISSN 0955-2219, https://doi.org/10.1016/j.jeurceramsoc.2018.07.009. (http://www.sciencedirect.com/science/article/pii/S095522191830428X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87835
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Jul 2018 20:19
Last Modified:29 Aug 2018 16:35

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