FLAKY ALPHA-ALUMINA CRYSTAL AND A METHOD OF ITS PREPARATION

摘要

The present invention relates to a flaky a-alumina crystal and a preparation method thereof. More particularly, the present invention relates to a flaky a- 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 a-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.