Polycrystalline AL2O3 bodies based on melted aluminum oxide
US8834588B2 · kind B2 · utility
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14Claims
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Key dates
| Filing date | Aug 15, 2011 |
| Grant date | Sep 16, 2014 |
| Priority date | — |
| Expiry date | Jan 29, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/5436
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to polycrystalline Al2O3 bodies based on melted aluminum oxide having a mean crystallite size of the primary crystals between 20 μm and 100 μm and a closed macroporosity between 10% by volume and 30% by volume. The polycrystalline Al2O3 bodies may be obtained by tapping out and quenching a liquid aluminum oxide melt and simultaneous seeding of the pouring stream with seed crystals and can be used advantageously for the production of abrasive materials and refractory products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.