METHOD OF PRODUCING MOULDED ALUMINIUM OXYNITRIDE IN BURNING MODE Russian patent published in 2009 - IPC C04B35/581 C04B35/626 C04B35/65 C01B21/72 

FIELD: chemistry.

SUBSTANCE: invention relates to making heat resistant ceramic materials, particularly to methods of producing aluminium nitride in burning mode. The method of producing aluminium oxynitride involves preparation of a reaction mixture of initial components, containing chromium (VI) oxide, aluminium oxide, aluminium and aluminium nitride, putting the reaction mixture into an SHS reactor in form of heat resistant material, made from quartz, graphite or stainless steel, ignition of the mixture with subsequent reaction of its components in burning mode under 0.1-10 MPa pressure in a nitrogen medium, or mixture nitrogen and air, or mixture of nitrogen and argon. After synthesis of the end product in form of an ingot, aluminium oxynitride is separated from the chromium aluminide ingot. Components of the reaction mixture are in the following ratio, wt %: chromium (VI) oxide 37.3-41.0; aluminium 31.0-34.0; aluminium oxide 22.7-25.0; aluminium nitride up to 9.0. A functional layer of aluminium oxynitride powder can be put between the reaction mixture of components and the wall of the mould.

EFFECT: increased output of aluminium oxynitride and its nitrogen content.

2 cl, 1 tbl