Title: Effects of slurry pH on porosity, pore radius distribution, microstructure and sinterability of alumina filter cake

Authors: Renjie Zeng, B. Rand

Addresses: Department of Materials Science and Engineering, The University of Xiamen, Xiamen 361005, China. ' Institute for Materials Research, School of Process, Environment and Materials Engineering, The University of Leeds, Leeds LS2 9JT, UK

Abstract: Effects of pH of primary slurries on properties of Alcoa A16 alumina filter cakes have been systemically studied. Lower true green porosity and specific total open pore volume, smaller open pore mode radius and lower population of macro-agglomerated defects in the filter cake are confirmed to be associated with deflocculation of the slurry. The fully deflocculated compact without cracking obtained from the slurry containing PVA, and PEG as well, at pH1.9, achieves a considerably higher sinterability, compared with the flocculated and the isopressed one.

Keywords: agglomerate; PEG; porosimetry; sintering dilatometry; alumina filter cakes; primary slurries; slurry pH; porosity; pore radius distribution; microstructure; sinterability; rheology.

DOI: 10.1504/IJMPT.2004.005000

International Journal of Materials and Product Technology, 2004 Vol.21 No.5, pp.435 - 442

Published online: 11 Aug 2004 *

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