INSTRUMENTED COMPACTION EXPERIMENTS UNDER VARIED CLIMATIC CONDITIONS

An attempt was made to reach a better understanding of the interactions between climatic conditions and the compaction behaviour of silicon nitride granulates with different binder/lubricant systems using instrumented compaction experiments. In addition to the continuous measurement of the pressure-...

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Bibliographic Details
Published in:Journal of Ceramic Science and Technology 2010, Vol.1 (1), p.59-66
Main Authors: Klemm, U, Schone, B, Svoboda, H, Fries, M, Nebelung, M
Format: Magazinearticle
Language:English
Subjects:
Binders
Compacts
Compressive properties
Density distribution
Granulation
Humidity
Shear
Silicon nitride
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Summary:An attempt was made to reach a better understanding of the interactions between climatic conditions and the compaction behaviour of silicon nitride granulates with different binder/lubricant systems using instrumented compaction experiments. In addition to the continuous measurement of the pressure-density development and the strength of the compacts, parameters were measured which characterised the friction conditions, the total compaction energy and their single parts, and the elastic re-deformation in axial and radial directions. From the calculation of shear and compressive stresses, conclusions were drawn regarding acting failure mechanisms and predictions of the expected density distribution. For the examined silicon nitride granulates, the deleterious influence of moisture on the whole pressing process and the defect rate of the compacts after storage of the granulates, at a humidity of > 50% before compaction, was verified. For this material, the changes in compaction behaviour were not reversible after storage at a lower humidity.
ISSN:2190-9385
DOI:10.4416/JCST2010-00016