Removing lost foam pattern coating residue from a casting
US6901989B1 · kind B1 · utility
6Cited by
4References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1999 |
| Grant date | Jun 7, 2005 |
| Priority date | — |
| Expiry date | Jun 14, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02F2200/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In the lost foam casting of aluminum, coating a fugitive pattern with a refractory coating containing a thermally stable, water-insoluble, acid-gasifiable (e.g. CaCO3) compound, and contacting the casting, with the coating thereon, with an acid to dissociate and gasify the compound and rupture the coating. Preferably, any thermal degradation products from the pattern residing in the coating are neutralized to promote wetting of the coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.