Flaky alpha-alumina crystal and a method of its preparation
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United States of America Patent
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Jun 14, 2011
Grant Date -
Jul 23, 2009
app pub date -
Jan 26, 2006
filing date -
Mar 25, 2005
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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.
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