Process for producing alpha-alumina powder

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

1994-06-29

1996-07-23

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

C01F 702

Patent

active

055387098

ABSTRACT:
A process for producing .alpha.-alumina powder comprising .alpha.-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.

REFERENCES:
patent: 3262754 (1966-07-01), Lindsay et al.
patent: 4822592 (1989-04-01), Misra
patent: 5149520 (1992-09-01), Sucech et al.
patent: 5302368 (1994-04-01), Harato et al.
62th CATSJ Meeting Abstracts: No. 2D105 (with full English translation), no date.

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