METHOD OF PRODUCING ALUMINA STRUCTURAL CERAMIC Russian patent published in 2016 - IPC C04B35/111 C04B35/626 C01F7/42 

FIELD: ceramic industry.

SUBSTANCE: invention relates to structural technology of porous ceramic materials and can be used as a heat-resistant insulating kiln furniture. From an aluminium alloy such as duralumin remove chips, consisting of fragments of an area of 160-200 mm² and a thickness of 0.1-0.2 mm. Chips are treated with aqueous sodium hydroxide solution with concentration of 7-25 % at heat sink from reaction volume coolant is recovered from a mother solution formed precipitate by vacuum filtration and washing precipitate tap water by multiple decantation to pH 8.5-9.2. Precipitate is dried on air at temperature 50-100 °C, then heat treated in air at temperature of 1,250-1,350 °C with holding for 1-2 hours. Milled product is added with 7-10 % aqueous solution of polyvinyl alcohol, taken in amount of 5-10 wt% in terms of dry residue substance and workpieces are pressed under pressure of 50-200 MPa, after which obtained material is sintered in air at 1,400-1,430 °C for 1-2 hours.

EFFECT: technical result of invention is increase in thermal stability of material in terms of multiple consecutive heating series while maintaining a sufficiently high strength.

1 cl, 1 tbl, 5 dwg, 3 ex