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Spray freeze granulation of submicrometre alpha-alumina using ultrasonication

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journal contribution
posted on 06.01.2017, 14:48 by Shaghayegh Ghanizadeh, Prabhu Ramanujam, Vaidhy VaidhyanathanVaidhy Vaidhyanathan, J.G.P. Binner
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.

Funding

This study was funded by the Engineering and Physical Sciences Research Council (EPSRC), United Kingdom

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Journal of Ceramics Science and Technology

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.

Publisher

© Goller Verlag GmbH

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

22/11/2016

Publication date

2017

Notes

This paper is made available online with kind permission of the publisher.

ISSN

2190-9385

Language

en