.alpha.-alumina in the form of spherical, non aggregated...

Details .alpha.-alumina in the form of spherical, non aggregated... .alpha.-alumina in the form of spherical, non aggregated...

C - Chemistry, Metallurgy

01

F

23/248

C01F 7/02 (2006.01) C01F 7/44 (2006.01) C01F 7/46 (2006.01)

Patent

CA 1288575

ABSTRACT OF THE DISCLOSURE Alpha-alumina consisting essentially of solid, spherical, non-aggregated particles, having a diameter from 0.06 to 2 µm, a polydispersion index below 2.0, a total porosity below 0.3 cc/g, a specific surface area from 0.7 to 80 m2/g, and an apparent density of the particles from 3.20 to 3.94 g/cm3. The alpha-alumina is prepared by a process consisting, in that an alpha-alumina precursor, having a water content from 2 to 33% by weight, at starting temperatures ranging from room temperature to 850°C, and consisting essentially of solid spherical, non-aggregated particles, having a particle diameter from 0.07 to 2.3 µm and a polydispersion index of ? 2.0, is subjected to a heat-treatment at temperatures ranging from 1130° to 1700°C, said precursor being instantaneously brought from the starting temperature to the treatment temperature, and by carrying out the treatment during times, as generally indicated in the accompanying Figure 1 between straight lines (a) and (b), which are sufficient to convert the precursor to phase alpha, but not such as to cause breakages and/or aggregations; the resulting product being then brought again to room temperature by means of a non- instantaneous cooling of the order of at least 10 seconds.

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