Ceramic-coated tungsten powder
US7989064B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Jan 9, 2006 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Jan 9, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The coating the tungsten powder particles with a ceramic barrier suppresses the leachability of tungsten in aqueous media. Preferably, the ceramic coating substantially encapsulates each particle of tungsten and has a thickness of at least about 30 nm and, more preferable, from about 200 nm to about 500 nm. Examples of ceramic coatings that may be used include, but are not limited to, aluminum oxide (alumina), aluminum oxyhydroxide (AlOOH), zirconium oxide (zirconia), cerium oxide (ceria), hafnium oxide (hafnia), and magnesium oxide (magnesia).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.