Method for preparing spherical aluminum oxynitride powder
US10144645B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2017 |
| Grant date | Dec 4, 2018 |
| Priority date | — |
| Expiry date | Aug 10, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2004/32
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for preparing spherical aluminum oxynitride powder, comprising the steps of (A) providing an alumina powder and a resin, both of which are then dispersed and dissolved in a solvent to form a mixed slurry; (B) subjecting the mixed slurry to spray drying to form a spherical powder; (C) subjecting the spherical powder to a carbonization treatment under an inert atmosphere to form a carbonized spherical powder; (D) subjecting the carbonized spherical powder to carbothermic reduction in a nitrogen-containing atmosphere at a temperature of 1450° C. to 1550° C.; (E) keeping the spherical powder that has been subjected to carbothermic reduction in the nitrogen-containing atmosphere to carry out a nitridation reaction at a temperature of 1700° C. to 1730° C., forming a nitrided spherical aluminum oxynitride powder; (F) subjecting the nitrided spherical aluminum oxynitride powder to decarbonization in an oxygen-containing atmosphere to form the spherical aluminum oxynitride powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.