Process for producing .alpha.-alumina powder

Details Process for producing .alpha.-alumina powder Process for producing .alpha.-alumina powder

C - Chemistry, Metallurgy

01

F

C01F 7/22 (2006.01) C01F 7/30 (2006.01) C01F 7/44 (2006.01)

Patent

CA 2127070

ABSTRACT OF THE DISCLOSURE A process for producing a-alumina powder comprising a-alumina single crystal particles, the process comprising the step of calcining at least one of transition alumina and a transition alumina precursor capable of becoming transition alumina on heating, in a gas atmosphere containing (1) at least about 5% by volume, based on the total gas atmosphere, of a halogen selected from fluorine, chlorine, bromine, and iodine, (2) at least about 1% by volume, based on the total gas atmosphere, of a hydrogen halide selected from hydrogen fluoride, hydrogen bromide, and hydrogen iodide, or (3) a component prepared from at least about 1% by volume, based on the total gas atmosphere, of a halogen gas selected from fluorine gas, bromine gas, and iodine gas, and at least about 0.1% by volume, based on the total gas atmosphere, of steam.

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