Foundry sand with oxidation promoter
US6447593B1 · kind B1 · utility
8Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 2001 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Apr 12, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C9/123
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Coating foundry sand with a thin layer of an oxidation-promoting catalyst. Preferred catalysts comprise ferric and cupric oxides. The catalysts promote the oxidation of any polymeric binder or residues admixed with the sand. The sand is coated by wetting the grains with a solution of a catalyst precursor, drying the sand and baking the sand in air to convert the precursor to the catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.