METHOD FOR OBTAINING NANOCRYSTALLINE POWDER BASED ON ZIRCONIUM DIOXIDE Russian patent published in 2023 - IPC C01G25/02 C01F17/218 B01F25/10 B82B3/00 B82Y40/00 

FIELD: chemical industry.

SUBSTANCE: manufacture of ceramics, proton-exchange membranes, dentures and fuel cells. First prepare the initial aqueous solutions of zirconium oxynitrate, yttrium nitrate and precipitant - ammonia. The resulting solutions are mixed in a microreactor with head swirling flows, setting their flow rates so as to ensure the stoichiometric ratio of components in the final product - nanocrystalline powder based on zirconium dioxide stabilized with yttrium oxide. In this case, the difference in the consumption of solutions can be no more than 4-5 times. A mixture of initial aqueous solutions of zirconium oxynitrate and yttrium nitrate is fed into one or more tangential nozzles 1 located in the swirl chamber 2. An aqueous solution of ammonia is fed into one or more tangential nozzles 4 located in the swirl chamber 5. These solutions are fed into nozzles 1 and 4 at speeds of 1-3 m/s. This ensures the head rotational movement of these aqueous solutions, which are mixed in the mixing chamber 6. Suspension 8, including zirconium oxyhydroxide and yttrium hydroxide, formed at the outlet of the microreactor, is separated from the mother liquor and subjected to low-temperature treatment at a temperature of minus 18°C to minus 25°C for 20-24 hours. The frozen precipitate is dried in a muffle furnace in alumina cups for 2 hours at 110°C in air and thermally treated at 500-800°C for 1 h. The obtained nanosized powders based on zirconium dioxide stabilized with yttrium oxide are characterized by a reduced degree of particle agglomeration and stable characteristics of their quality due to the formation of OH groups on their surface with a high oxygen-hydrogen binding energy, providing a chemical bond between them.

EFFECT: high-performance, easy to scale it to the industrial level.

3 cl, 7 dwg, 2 tbl, 2 ex