Alumina sintered body and method for manufacturing the same
US11998986B2 · kind B2 · utility
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Key dates
| Filing date | Dec 23, 2022 |
| Grant date | Jun 4, 2024 |
| Priority date | — |
| Expiry date | Dec 23, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/75
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An alumina sintered body having a low dielectric loss tangent and a method for manufacturing the alumina sintered body are provided. An alumina sintered body contains Al2O3 99.50 mass % or more, and 99.95 mass % or less and sodium and silicon, wherein at a surface layer A in any given cross-section and a central portion B of the cross-section in a depth direction from the surface layer A, a concentration ratio of sodium to silicon in the surface layer A is smaller than the concentration ratio of sodium to silicon at the central portion B.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.