METHOD OF PRODUCING TRANSPARENT ALUMINIUM-MAGNESIUM SPINEL Russian patent published in 2016 - IPC C04B35/443 C04B35/626 C01F7/16 

FIELD: physics, optics.

SUBSTANCE: invention relates to an optical oxide ceramic based on an aluminium-magnesium spinel MgAl₂O₄ for the use in optical instrument-making. The aluminium-magnesium spinel based transparent ceramic is widely used in engineering due to its high transparency, wear and chemical resistance, as well as the transmission of electromagnetic radiation in a wide spectrum from near UV to the mid-infrared range. The source spinel powder is obtained from a solution of double magnesium-aluminium isopropylate via the hydrolysis of double magnesium-aluminium isopropylate and an azeotropic mixture of isopropyl alcohol and water at a temperature not higher than 100°C, with the ratio of the double magnesium-aluminium isopropylate to water of 1:8. The obtained spinel powder in the form of magnesium-aluminium hydroxide is calcined at 1100-1200°C, followed by hot pressing at 1400-1500°C and gasostatic pressing at 1700-1900°C.

EFFECT: simple technique of producing nanodispersed spinel powder, high efficiency and low cost of the end product - a transparent ceramic.

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