Pressure sintering of powder materials

Rheological models for pressure sintering of powder materials are described. The rheological models of deformable bodies and the associated dynamic deformation theory for porous bodies based on the energy conservation law enable a quantitative description of their densification under impulse and static hot pressing as well as hot forging using crank presses. The simulation of compaction of porous metals shows that the viscosity of the matrix, that forms the porous body, and the activation energy of viscous deformation dramatically decrease with increasing initial impact velocity. This promotes the compaction of the material to practically nonporous state and improves its mechanical properties.