METHOD FOR PREPARING A SPHERICAL ALN GRANULE
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United States of America Patent
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Sep 7, 2016
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Sep 7, 2016
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Abstract
A method for preparing a spherical aluminum nitride granule includes (A) providing an aluminum oxide powder and a resin, followed by dissolving the aluminum oxide powder and the resin in a solvent to form a mixed slurry; (B) performing spray drying on the mixed slurry to form a spherical granule; (C) performing carbonization on the spherical granule in an inert atmosphere to form a carbonized spherical granule; (D) performing carbothermic reduction on the carbonized spherical granule in a nitrogen atmosphere to form a spherical aluminum nitride granule; (E) performing a densification sintering thermal treatment continuously on the spherical aluminum nitride granule in a nitrogen atmosphere; and (F) performing decarbonization on the densified spherical aluminum nitride granule in a nitrogen atmosphere to form densified spherical aluminum nitride sintered particles of tens of micrometers. Accordingly, the manufacturing process is simple and energy-saving.
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