Method of removing ceramic coatings
US6379749B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Dec 5, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23P2700/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of removing a ceramic coating (18), and particularly zirconia-containing thermal barrier coating (TBC) materials such as yttria-stabilized zirconia (YSZ), that has been either intentionally or unintentionally deposited on the surface of a component (10). The method entails subjecting the ceramic coating (18) to an aqueous solution containing an acid fluoride salt, such as ammonium bifluoride (NH4HF2) or sodium bifluoride (NaHF2), and a corrosion inhibitor. The method is capable of completely removing the ceramic coating (18) without removing or damaging the underlying substrate material, which may include a metallic bond coat (16).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.