.alpha.-alumina

Details .alpha.-alumina .alpha.-alumina

C - Chemistry, Metallurgy

01

F

C01F 7/44 (2006.01) C01F 7/02 (2006.01) C30B 25/00 (2006.01) C30B 29/20 (2006.01)

Patent

CA 2137248

ABSTRACT OF THE DISCLOSURE .alpha.-Alumina comprising .alpha.-alumina single crystal particles which are homogeneous containing no crystal seed inside the particles; have an octa- or higher polyhedral shape; have a D/H ratio of from 0.5 to 3.0, wherein D represents a maximum particle diameter parallel to a hexagonal lattice plane of a hexagonal close-packed lattice of the particles, and H represents a diameter perpendicular to the hexagonal lattice plane; have a number average particle diameter of more than 5 µm and not more than 30 µm; have a sodium content of less than 0.05% by weight in terms of Na2O; and have an alumina purity of not less than 99.90% by weight. .alpha.-Alumina in a powder form composed of .alpha.-alumina single crystal particles having a high punity, a fine and uniform composition, a narrow particle size distribution, and an octa- or higher polyhedral shape which are not aggromerates. The .alpha.-alumina of the invention is useful as an abrasive, a raw material for sintered products, a raw material for a encapsulations, a raw material for ceramic filters, etc. and, owing to its high purity, particularly useful as a raw material for single crystals, e.g., yttrium aluminum garnet (YAG), sapphire, ruby, etc. and as a raw material for high purity sintered products. - 25 -

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