Abstract
We develop a new theoretical model for metal powder compaction that describes the relationship between the green porosity of the compacts and the applied external pressure. This model, applicable to ductile powders both with uniform and non-uniform particle sizes and regular and irregular particle shapes, contains only empirical constants that are physically explained. Among these constants, values related to the plastic behaviour of the material constituting the powder particles as well as the friction coefficient between the powder and die walls are included. The interparticle friction is also considered as a kind of constraint that diminishes the local pressure borne by the fully dense material. Also the tap porosity, an extremely useful parameter that contains the morphometric information of the powder, is considered. The proposed model has been experimentally validated with six metal powders of different types. The agreement between the model and the experimental data is very satisfactory over the tested pressure range. For comparison, the classic model by Fischmeister and Artz has also been fit to the experimental curves.
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