α-alumina particles and method for manufacturing the same
AssigneeDIC Corporation
InventorsJianjun Yuan, Hiroshi Kinoshita
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Abstract
The present invention aims to provide a simple and efficient method for manufacturing α-alumina particles, main component particles of which each have a crystal face other than the face [001] as a main crystal face and a polyhedral shape other than a hexagonal bipyramidal shape. According to the method for manufacturing α-alumina particles of the present invention, when an aluminum compound is calcined in the presence of a specific content of a metal compound, α-alumina particles each having a particle diameter of 50 μm or less, a degree of α crystallization of 90% or more, and a polyhedral shape can be obtained.
Claims12
α-alumina particles each having a particle diameter of 50 μm or less, a degree of α crystallization of 90% or more, a crystal face other than the face [001] as a main crystal face, and a polyhedral shape other than a hexagonal bipyramidal shape, wherein the α-alumina particles contain molybdenum oxide and/or vanadium oxide.
A method for manufacturing polyhedral α-alumina particles, the method comprising:
- calcining an aluminum compound in the presence of a metal compound,
- wherein aluminum in the aluminum compound and a metal in the metal compound are set so that a molar ratio of metal/aluminum is in a range of 0.03 to 3.0
- wherein the calcination is performed in an air or an oxygen atmosphere or in an inert atmosphere of nitrogen or argon.
Dependencies are inferred from the claim text.