METHOD OF PRODUCING CRYSTALLINE POWDER OF CHROMIUM-NICKEL SPINEL Russian patent published in 2020 - IPC C04B35/12 C04B35/42 

FIELD: chemistry.

SUBSTANCE: invention relates to production of crystalline powder of chromium-nickel spinel NiCr₂O₄, which can be used to create heat-regulating coatings with high emissivity for use in machine building, space engineering, nuclear power engineering and other high-technology industries. Invention consists in method of obtaining crystalline powder of chromium-nickel spinel of composition NiCr₂O₄, which includes preparation of initial charge containing powders of nickel oxide, chrome oxide, taken in stoichiometric ratio, their homogenisation, arrangement and thermal treatment of the mixture in a muffle furnace at temperature of 950–1050 °C for 1 to 3 hours with additional introduction of a melt solvent selected from series Li₂MoO₄, NaCl at ratio of 20 to 70 wt. % to obtained product NiCr₂O₄, and crystalline powder of nickel-chromium spinel NiCr₂O₄ is separated from melt solvent by dissolving it in water at temperature of 90–95 °C.

EFFECT: invention enables to obtain crystalline powder of chromium-nickel spinel with significant reduction of power consumption, and also obtaining crystalline powders of chromium-nickel spinel of cubic structure, having high emissivity (ε = 0_94) with grain composition of 40–100 mcm, suitable for gas-flame sputtering, and grain composition of less than 40 mcm, which is suitable for paint-and-lacquer technologies.

1 cl, 5 ex