.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

C - Chemistry, Metallurgy

01

F

C01F 7/30 (2006.01) C01F 7/32 (2006.01) C01F 7/44 (2006.01) C09K 3/14 (2006.01)

Patent

CA 2121198

ABSTRACT OF THE DISCLOSURE 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. - 55 -

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