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Spray Freeze Granulation of Submicrometre α-Alumina Using Ultrasonication

S. Ghanizadeh, P. Ramanujam, B. Vaidhyanathan, J. Binner, J. Binner

Journal of Ceramic Science and Technology, Vol. 7, No. 4 (2016), pp. 455-462

DOI: 10.4416/JCST2016-00078

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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.

Keywords

Keywords: Alumina, granulation, spray-freeze drying, two-stage sintering

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