CHARGE BASED ON ALUMINIUM OXIDE, AND METHOD FOR OBTAINING STRONG CERAMICS Russian patent published in 2014 - IPC C04B35/111 C04B35/626 

FIELD: metallurgy.

SUBSTANCE: invention relates to technology for obtaining ceramic material with high strength characteristics and can be used for manufacture of wear- and chemically resistant items, as well as for manufacture of items for military equipment, namely ceramic armour elements. Charge based on aluminium oxide contains a mineralising additive. The latter consists of a eutectic additive of MgO-Al₂O₃-SiO₂ system, magnesium oxide and yttrium oxide. Charge components are contained in the following ratio, wt %: Al₂O₃ 97.50-98.70, SiO₂ 0.60-0.70, MgO 0.43-0.80, Y₂O₃ 0-0.30. In order to prepare an eutectic additive, alumina, silicone oxide and magnesium oxide are mixed; then, heat treatment is performed at the temperature of 1280±20°C (below eutectics temperature). Sinter is crushed till fine-grained powders are obtained. Alumina and mineralising additives are mixed by means of a method of wet grinding in water medium according to the proposed ratio; moulding powder is obtained by a spraying drying method, and items are pressed and baked. Ceramics baking is performed in a tunnel furnace at the temperature of 1650-1680°C and exposure of 1-2 h.

EFFECT: achieving increase of strength characteristics of the ceramic material and reducing prime cost of the ceramic material.

4 cl, 3 ex, 1 tbl, 2 dwg