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Title: Spray freeze granulation of submicrometre alpha-alumina using ultrasonication
Authors: Ghanizadeh, Shaghayegh
Ramanujam, Prabhu
Vaidhyanathan, Bala
Binner, J.G.P.
Keywords: Alumina
Spray-freeze drying
Two-stage sintering
Issue Date: 2017
Publisher: © Goller Verlag GmbH
Citation: GHANIZADEH, S. ... et al., 2017. Spray freeze granulation of submicrometre alpha-alumina using ultrasonication. Journal of Ceramics Science and Technology, 7(4), pp. 455-462.
Abstract: Granulation is a key factor towards improvement of the flowability of fine ceramic powders to make them suitable for industrial dry pressing. Controlled granulation of fine alumina particles with a primary particle size of ∼ 150 nm was carried out using spray-freeze drying, which led to the production of flowable granules with high crushability. The fracture surface of uniaxially die-pressed green bodies made from granules with density values of ≥ 50%of theoretical showed a uniform microstructure. Sintering experiments were performed using conventional single- and two-stage radiant heating methods followed by density and grain size measurement and characterisation of the final dense compacts to study the efficiency of two-stage sintering in grain growth elimination. The results have been compared with those of alumina bodies prepared using similar suspension by the slip-casting route.
Description: This paper is made available online with kind permission of the publisher.
Sponsor: This study was funded by the Engineering and Physical Sciences Research Council (EPSRC), United Kingdom
Version: Published
DOI: 10.4416/JCST2016-00078
URI: https://dspace.lboro.ac.uk/2134/23628
Publisher Link: http://dx.doi.org/10.4416/JCST2016-00078
ISSN: 2190-9385
Appears in Collections:Published Articles (Materials)

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