Flaky alpha-alumina crystal and a method of its preparation

Details Flaky alpha-alumina crystal and a method of its preparation Flaky alpha-alumina crystal and a method of its preparation

2011-06-14

2011-06-14

Langel, Wayne (Department: 1736)

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

Reexamination Certificate

active

07959894

ABSTRACT:
The present invention relates to a flaky α-alumina crystal and a preparation method thereof. More particularly, the present invention relates to a flaky α-alumina crystal comprising aluminum oxide and zinc oxide, which is prepared by hydrolyzing an aluminum precursor solution containing a water-soluble flux and a zinc precursor solution to obtain a gel mixture and aging, drying, calcining and crystallizing it under a specific reaction condition, and a preparation method thereof. Since the flaky α-alumina crystal of the present invention has a thickness of less than 0.5 μm, an average particle diameter of at least 15 μm and an aspect ratio of at least 50, it is useful as high-quality pearlescent pigment material and filler for ceramic materials.

REFERENCES:
patent: 7067157 (2006-06-01), Fukuda et al.
patent: 7858067 (2010-12-01), Maki et al.
patent: 1 286 003 (1972-08-01), None
patent: 07-331110 (1995-12-01), None

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