Abstract
A new theoretical model for compaction of powders has been proposed based on the contribution of two different types of mechanism. The first type is the rearrangement of powder particles which essentially acts at low compacting pressures. The second includes plastic deformation, fragmentation, or a combination of the two processes. The equations derived have been directly applied to the load-displacement curve obtained by pressing the powders in a die on a mechanical testing machine and recording the ram travel and the transmitted load. Tests on very different kinds of materials (organic compounds, magnesium oxide, flint clays, metallic powders) showed that the proposed theoretical model gives a very good description of the compaction process. Furthermore, the constants in the derived equations have been combined to obtain reliable parameters (maximum density attain- able, compaction ratio). PM/0447
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