Abstract
Several mechanisms, such as volume or surface diffusion, viscous or plastic flow, and vapor transport, have been proposed in the literature to account for the transport of material during the sintering process. The manner in which such mechanisms can be responsible for experimental observations is reviewed, and attention is drawn to the limitations imposed by the present understanding of the principles involved. Examples are given of the theoretical models and mathematical expressions which have been derived for particular mechanisms and of attempts to apply these to empirical data. Suggestions for further investigations are given briefly.
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