Spray Freeze Granulation of Nano Powders for Die Pressing


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The processing of nanocrystalline yttria doped zirconia powder via dry forming routes has been investigated via the granulation of the powder using spray freeze drying (SFD). Free-flowing and crushable powders suitable for either die or isosatic pressing have been achieved via the combination of SFD with additions of up to 2 vol% of Freon 11; the latter reducing the strength of the granules whilst not affecting the powder flowability into the die. The approach has allowed relic-free green bodies of up to 55% of theoretical density to be produced using pressures as low as 250 MPa.



Edited by:

Pietro VINCENZINI, Ralf RIEDEL, Alexander G. MERZHANOV and Chang-Chun GE






J. Binner et al., "Spray Freeze Granulation of Nano Powders for Die Pressing", Advances in Science and Technology, Vol. 63, pp. 1-6, 2010

Online since:

October 2010




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