Sintering of Powder Materials under External Pressure

Abstract

Composite rheological models for pressure sintering of porous materials are described. The dynamic theory of the porous bodies deformation developed on their basis using the energy conservation law enables quantitative description of densification of the latter under impulse and static hot pressing as well as hot forging in crank presses. The simulation for the porous metal hot compaction shows that the viscosity of the matrix forming the porous body as well as the activation energy of viscous deformation are dramatically decreased with increasing initial impact velocity. This promotes the densification of the porous material up to practically non-porous state, elevation and reproducibility its mechanical properties.