Abstract
Transmission electron microscopy and X-ray radiography are used to show that pressing of α-aluminum oxide powders at pressures up to 2.0 GPa is accompanied by crushing of particles and the appearance of dislocations with a density of about 1011 cm−2. Sintering of these powders at temperatures up to 1550°C reduces the dislocation density 2–4-fold. When the compacts reach a critical density (about 62%) the shrinkage in sintering of nonsintered powders is shown to be independent of the compact density and the pore size. The increase in the sintering rate with increase in the hydrostatic pressure to 0.6 GPa is shown to be caused mainly by an increase in the compact density and at still higher pressures by the mechanical activation of the powders.
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