Method of producing a spherical aluminum nitride powder
AssigneeTokuyama Corporation
InventorsTakatoshi Muneoka, Kazutaka Watanabe
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Abstract
To provide a method of producing a spherical aluminum nitride powder which has a large thermal conductivity and excellent filling property, and is useful as a filler for heat-radiating materials. [Means for Solution] The spherical aluminum nitride powder is produced by reductively nitriding a mixture of 100 parts by mass of an alumina or an alumina hydrate, 0.5 to 30 parts by mass of a rare earth metal compound and 38 to 46 parts by mass of a carbon powder at a temperature of 1620 to 1900° C. for not less than 2 hours.
Claims2
A method of producing a spherical aluminum nitride powder, comprising:
- mixing 100 parts by mass of an alumina or an alumina hydrate, 0.5 to 30 parts by mass of a compound containing a rare earth metal, and 38 to 46 parts by mass of a carbon powder to obtain a mixture thereof;
- and
- reductively nitriding the alumina or the alumina hydrate by holding said mixture in a nitrogen-containing atmosphere at a temperature of 1620 to 1900° C. for not less than 2 hours.
A spherical aluminum nitride powder comprising aluminum nitride particles which have an average particle diameter of 3 to 30 μm, a content of a rare earth metal in a range of 0.4% by weight to 28% by weight calculated as an oxide thereof, and a lattice constant of the C-axis of the aluminum nitride crystals of not less than 4.9800 Å.
Dependencies are inferred from the claim text.