Compaction models of copper powders with various properties

Abstract

Currently, there are several theoretical models of compaction of a powder medium that allow us to describe the behavior of a powder material under pressure. They are based on the dependence of the density of the samples vs efforts of their compaction in molds. However, each of them can most accurately reflect only a certain stage of compaction of powder materials; therefore, there is a need to verify the theoretical models of compaction applicable to metal powders, which are widely used in industry. For the study, we chose the common PMS-1 and PMR copper powder with different particle size distribution (50–400 μm) and particle shape (dendritic and spherical). The powder was pressed in a cold state on a hydraulic press. The experiment showed that the equation of M.Y. Balshin most accurately describes the formation of copper with a dendritic particle shape at the stage of structural compaction, but in the zone of mixed deformations this equation does not correspond to experimental data, as does the equation of G.M. Zhdanovich. The N.F. Kunin and B.D. Yurchenko equation did not describe the experimental compression curves, and the equation of A.N. Nikolaev does not agree with the real dependence of the PMR copper on a narrow particle size distribution, while the calculated forces for dendritic copper with the same composition correspond to the experiment. The S. Torre compaction model at 225 MPa was closest to the experiment.