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Abstract
1. Recrystallization sintering of aluminum oxide (alumina) can be activated: a) By increasing the free surface energy of the alumina (dispersion); b) By using active forms of alumina (increasing the energy state of the surface); c) Heat treatment of the alumina; d) The introduction of additions. 2. The most effective factor determining the activation of sintering is additions, which deform the aluminum oxide crystal lattice with the appearance of defects in it in the form of vacant sites in the lattice. 3. The most effective sintering addition is titanium dioxide. The addition of Cr2O3 and MgO and the combined addition of MgO + TiO2 are of interest for commercial purposes. 4. The prolonged treatment of commercial aluminum oxide with hydrochloric acid can cause a certain retardation of the sintering process. 5. The activation of the recrystallization sintering of aluminum oxide has solved a number of technical problems: the preparation of high-strength corundum cutting tools, the preparation of dense crucibles for the smelting of special metals and alloys, the production of tips for immersion thermocouples, and certain forms of refractory components.
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