Method of improving the removal of investment casting shells
US7503379B2 · kind B2 · utility
3Cited by
10References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2006 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Mar 6, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D29/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of improving the removal of an investment casting shell surrounding a metallic article. The shell is made from the deposit of layers refractory slurry and stucco onto a pattern. The shell contains, after firing, an amount of an alkali metal oxide or an alkaline earth metal oxide sufficient to reduce the strength of the shell. By this invention, after firing of the shell and pouring of the molten metallic part into the shell, the shell is hydrated to further reduce the strength of the shell, to facilitate its removal from the metallic part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.