Finely divided oxide and its manufacture

Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing

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423111, 423133, 423628, 501153, C01F 702

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active

048063339

ABSTRACT:
A product suitable as a ceramic comprises substantially nonaggregated alumina particles with 95% by number having an aspect ratio (i.e., the ratio of the longest dimension to the shortest dimension for any single particle) not greater than 1.1 and more than 80% having an aspect ratio not greater than 1.05 and having a geometric mean size of from 0.02 to 0.5 microns. Usually the product contains no more than 3% by weight as aggregates and preferably the product is as small as can conveniently be manufactured.

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patent: 3449072 (1969-06-01), Freeman
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patent: 4241042 (1980-12-01), Matijevic et al.
patent: 4532224 (1985-07-01), Hori
patent: 4574078 (1986-03-01), Cortesi et al.
Journal of Paint Technology, vol. 47, No. 604, May 1975, "Review of Common Methods of Particle Size Measurement", pp. 35-56.
J. Australian Ceramic Soc., "Submicron AlO-TiO Powders Condensed from a Plasma", by M. S. J. Gani and R. McPherson, Nov. 1972, pp. 65-69.
Bulletin of the Chemical Society of Japan, "Reaction between Aluminium Trichloride and Oxygen in the Vapor Phase and Properties of the Aluminium Oxide Formed", by Y. Shoji, K. Tatsumi, R. Matsuzaki and Y. Saeki, vol. 53, pp. 269-270, 1980.

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