The kinetics of densification of alumina powder compacts at 1000° to 1200°C were studied by using a dilatometer to monitor volumetric changes during hot isostatic pressing. The densification rate is proportional to the square of the applied pressure, and densification does not occur below a threshold pressure. Results are interpreted in terms of an interface‐controlled reaction mechanism involving the movement of grain‐boundary dislocations.
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Wills et al. (1985) studied this question.
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