Methods for forming ceramic cores
US10364189B2 · kind B2 · utility
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12References
17Claims
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Key dates
| Filing date | May 4, 2017 |
| Grant date | Jul 30, 2019 |
| Priority date | — |
| Expiry date | Jul 14, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C27/04
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Methods for forming ceramic cores are disclosed. A ceramic core formed using the method of the present application includes a silica depletion zone encapsulating an inner zone. The inner zone includes mullite and the silica depletion zone includes alumina. The method includes heat-treating a ceramic body in a non-oxidizing atmospheric condition for an effective temperature and time combination at a pressure less than 10−2 atmosphere to form the silica depletion zone at a surface of the ceramic core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.