Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1996-02-26
1999-08-10
Bos, Steven
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C01F 702
Patent
active
059355506
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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Mohri Masahide
Sawabe Yoshinari
Uchida Yoshio
Watanabe Hisashi
Bos Steven
Sumitomo Chemical Company Limited
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