.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 2137249

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, and 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; and the .alpha.-alumina has a number average particle diameter of from 0.1 to 5 µm and a narrow particle size distribution. The .alpha.-alumina of the invention comprises .alpha.-alumina single crystal particles having nearly spherical shape and fine and uniform structure and have a narrow particle size distribution. It is of high industrial use as an abrasive, a raw material for sintered products, a plasma spraying material, a filler, a starting material for single crystals, a raw material for a carrier for catalysts, a raw material for fluorescent substances, a raw material for encapsulations, a raw material for ceramic filters, etc. and particularly suitable as a precise abrasive, a raw material for sintered products, and a raw material for ceramic filters. - 24 -

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