Patent ID: 8052957

Claim:
A method of manufacturing flake aluminum oxide using a microwave, comprising: grinding alumina hydrate or aluminum salt and then classifying particles having a size of about 5 to 50 μm to form a pre-treated starting material; heating the pre-treated starting material to form a transition alumina; mixing the transition alumina with one or more molten salts selected from the group consisting of calcium carbonate, sodium chloride, potassium carbonate, potassium sulfate and sodium sulfate, and one or more additives selected from the group consisting of LiF, AlF 3 , NaF, NaPF 6 and K 2 TiF 6 to form a mixture, and then dispersing and grinding the mixture; heating the dispersed and ground mixture with a microwave heating source at a frequency of 915 MHz to melt and synthesize a flake aluminum oxide; separating the molten salt and the additive from the synthesized flake aluminum oxide to obtain a separated synthesized flake aluminum oxide; and post-treating the separated synthesized flake aluminum oxide by removing any additive residue on a surface of a crystal particle of the separated synthesized flake aluminum oxide.