Abstract
A survey has been carried out of the literature on hot-pressing theories and models. Theories as to the mechanism governing the process may be divided into two principal groups:(1) Mathematical representation of densification. Equations have been derived for mechanisms controlled by plastic or viscous flow. Also equations of a purely empirical nature have been advanced. In this group there is a trend towards a hyperbolic hot-pressing equation, which, according to tests, is valid for metals and metallic compounds over wide temperature ranges.(2) Theories asserting that the densification process is controlled by various processes, e.g. particle gliding, fragmentation, plastic flow, and volume diffusion. No complete mathematical formula has been proposed on this basis to describe the entire hot-pressing process.
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