Modeling and optimization of uniaxial magnetic pulse compaction of nanopowders

An experimental and theoretical study of the process of the uniaxial magnetic pulse compaction of nanopowders is conducted. The experimentation is carried out using aluminum oxide powders. The developed theoretical model includes the integrated description of the pulse magnetic field and of the dynamics of the mechanical system (of the moving pressing tooling and of the densified powder). The powder constitutive behavior is considered in the framework of the phenomenological theory of plastic porous bodies with hardening. The direct experimental data input enables the introduction of all the parameters necessary for the theoretical calculations. Based on the developed model, the influence of a broad range of pressing conditions and parameters (the densified powder mass, the mass of the accelerated press equipment parts, specimen diameter, etc.) on the final specimen density and on the effectiveness of the magnetic pulse compaction is studied. The process conditions, under which the optimal inertia properties of the pressing device lead to the fabrication of high-density components, are determined.