Optically transparent gamma-aluminum oxynitride powders and ceramic articles shaped therefrom
US5688730A · kind A · utility
10Cited by
8References
26Claims
0Family size
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Key dates
| Filing date | Jul 19, 1996 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | Jul 19, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S501/905
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Gamma-aluminum oxynitride ground powders, white in color and well suited for conversion into optically transparent ceramic shaped articles, 100% of the particles of which being less than 10 .mu.m in size and exhibiting a transmittance of at least 8%, are prepared by grinding particulate gamma-aluminum oxynitride agglomerates having a porosity of greater than 75%, such agglomerates themselves being produced by interreacting dry powdery admixture of aluminum nitride, alpha-alumina, and an alumina of high specific surface area or precursor thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.