Process for production of fine .alpha.-alumina powder

Details Process for production of fine .alpha.-alumina powder Process for production of fine .alpha.-alumina powder

1993-01-28

1995-09-12

Bell, Mark L.

Abrasive tool making process, material, or composition

With inorganic material

Clay, silica, or silicate

501127, 501153, 423600, 423625, 423628, C09C 168

Patent

active

054493897

ABSTRACT:
A process for production of a fine alpha-alumina powder having a specific surface area of not smaller than 10 m.sup.2 /g and superior polishing characteristics is provided, the process comprising heat-treating a mixture of gamma-alumina powder and silica at a temperature at which gamma-alumina is converted to alpha-alumina in the presence of silica, wherein the mixture contains not more than about 10 wt % of silica, based on the weight of the gamma-alumina.

REFERENCES:
patent: 2702750 (1955-02-01), George
patent: 3486849 (1969-12-01), Gatti
patent: 3619131 (1971-11-01), Grabmaier
patent: 4169883 (1979-10-01), Murrell et al.
patent: 4937062 (1990-06-01), Jordan et al.
patent: 4946664 (1990-08-01), Van Zyl et al.
"X-Ray Diffraction Examination of Gamma Alumina" Feb. 1945 pp. 158-163 M. H. Jellinek et al Industrial & Engineering Chem.

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