Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 34, Issue 5, Pages 1303-1310Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.11.006
Keywords
Particle-stabilized foams; Porous ceramics; Zirconia foam; Colloidal chemistry
Categories
Funding
- Next Generation Military Battery Research Center Program of the Defense Acquisition Program Administration and Agency for Defense Development
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Highly porous zirconia ceramics were prepared utilizing a particle-stabilized direct foaming technique in which the hydrophilic characteristic of zirconia particles was altered by the in situ adsorption of valeric acid on its surface. These surface modified zirconia particles are irreversibility adsorbed at the air/water interface and create an armor coating around the bubbles to stabilize them. In this study, the foamability and stability of zirconia foam were investigated by varying the valeric acid concentration, and zirconia foam with a foam volume of approximately four times the colloidal system volume was successfully prepared. The sintered foam has cell size ranging from 50 to 150 pm and the pore structure was characterized by mercury porosimetry. The effects of the sintering temperature on the grain size, strut wall thickness, and tetragonal phase were studied and correlated with an increase in the mechanical strength to 3.5 MPa with porosity of more than 90%. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
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