Uniaxial compaction of nanopowders on a magnetic-pulse press

Uniaxial magnetic-pulse compaction of nanosize powders is studied experimentally and theoretically. Experiments are carried out with powders based on aluminum oxide. The theoretical model of the process includes the consistent solution of equations describing the dynamics of the pulsed magnetic field as well as the dynamics of the mechanical system (movable parts of the press and the powder being compacted). The behavior of the powder is described using the phenomenological theory of a plastically compacted porous body. Direct comparison with experimental data makes it possible to determine all input parameters required for theoretical calculations. A wide range of pressing conditions is investigated and the effect of parameters such as the mass of the powder being compacted and the mass of the parts of the press being accelerated is analyzed. The conditions are determined for the most effective use of inertial properties of the press, which must result in high-density products of compacted powders.