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Design of porous aluminum oxide ceramics using magnetic field-assisted freeze-casting

Published online by Cambridge University Press:  06 August 2020

Said Bakkar ,
Jihyung Lee ,
Nicholas Ku ,
Diana Berman ,
Samir M. Aouadi ,
Raymond E. Brennan  and
Marcus L. Young
Said Bakkar
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, USA
Jihyung Lee
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, USA
Nicholas Ku
Affiliation:
CIV USARMY CCDC ARL, U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005-5425, USA
Diana Berman
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, USA
Samir M. Aouadi
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, USA
Raymond E. Brennan*
Affiliation:
CIV USARMY CCDC ARL, U.S. Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005-5425, USA
Marcus L. Young*
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203, USA
*
a)Address all correspondence to these authors. e-mail: raymond.e.brennan.civ@mail.mil
b)e-mail: marcus.young@unt.edu
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Abstract

Magnetic field-assisted freeze-casting of porous alumina structures is reported. Different freeze-casting parameters were investigated and include the composition of the original slurry (Fe3O4 and PVA content) and the control of temperature during the free casting process. The optimum content of the additives in the slurry were 3 and 6 wt% for PVA and Fe3O4, respectively. These conditions provided the most unidirectional porous structures throughout the length of the sample. The sintering temperature was maintained at 1500 °C for 3 h. The application of a vertical magnetic field (parallel to ice growth direction) with using a cooling rate mode technique was found to enhance the homogeneity of the porous structure across the sample. The current study suggests that magnetic field-assisted freeze-casting is a viable method to create highly anisotropic porous ceramic structures.

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Journal of Materials Research , Volume 35 , Issue 21 , 16 November 2020 , pp. 2859 - 2869
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Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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