α---ALUMINA POWDER AND A METHOD OF ITS PRODUCING Russian patent published in 1998 - IPC

FIELD: chemical technology, inorganic chemistry. SUBSTANCE: method of producing α---alumina powder involves stage of calcination of transient alumina or its precursor that is able to convert to transient alumina at heating in gaseous atmosphere containing hydrogen halide, halogen mixture and water vapor or halogen in the presence of seeds and/or form-regulating agent. α---Alumina powder consists of particles exhibiting the narrow distribution of the preferred size, mainly octahedral or icosahedral form and specific structure. α---Alumina powder can be used as raw material for production of abrasive material, filling agents, sintered material and empty space filling agents. EFFECT: improved method of producing. 25 cl, 16 dwg, 73 ex