Method for preparing polycrystalline aluminum oxynitride having enhanced transparency
US9321688B2 · kind B2 · utility
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Key dates
| Filing date | Feb 28, 2012 |
| Grant date | Apr 26, 2016 |
| Priority date | — |
| Expiry date | Mar 21, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/9653
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed is a method for preparing polycrystalline aluminum oxynitride having enhanced transparency, and preparing polycrystalline aluminum oxynitride by sintering a powder mixture of Al2O3 and AlN under atmospheric pressure, wherein the content of AlN is set to 17 to 26 mol %, a first sintering is performed at 1,575° C. to 1,675° C. so as to enable raw-material powders to have a relative density of 95% or higher, and a second sintering is performed so as to enable the raw-material powders to have a higher relative density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.