.alpha.-alumina powder and process for producing the same

Details .alpha.-alumina powder and process for producing the same .alpha.-alumina powder and process for producing the same

1999-04-06

2000-12-12

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

117 7, C01F 702, C30B 100

Patent

active

061594415

ABSTRACT:
A process for producing .alpha.-alumina powder 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) a hydrogen halide, (2) a component prepared from a halogen and steam or (3) a halogen, in the presence of at least one of a seed crystal and a shape-controlling agent. The .alpha.-alumina powder is particularly useful as a raw material for abrasives, fillers, sinters or spacers which comprises .alpha.-alumina particles having a substantially octahedral or eicosahedral shape, a specific structure, and a narrow primary particle size distribution.

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