Method of removing ceramic coatings

Details Method of removing ceramic coatings Method of removing ceramic coatings

C - Chemistry, Metallurgy

23

F

C23F 1/44 (2006.01) C23F 1/26 (2006.01) C23F 4/00 (2006.01) C23F 11/08 (2006.01)

Patent

CA 2430511

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 a ceramic coating (18) to an aqueous solution containing an acid fluoride salt, such as ammonium bifluoride (NH4HF2) or sodium bifluoride (NaF2), 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).

L'invention concerne un procédé d'enlèvement d'un revêtement céramique (18), en particulier un matériau de revêtement à couche isolante (TBC) contenant de la zircone, tel que la zircone stabilisée par yttrium (YSZ), qui a été déposé intentionnellement ou fortuitement sur la surface d'un composant (10). Le procédé consiste à soumettre un revêtement céramique (18) à une solution aqueuse contenant un sel de fluorure acide (tel que le bifluorure d'ammonium (NH¿4?HF¿2?) ou le bifluorure de sodium (NaF¿2?)), et à un inhibiteur de corrosion. Le procédé de l'invention permet d'éliminer complètement le revêtement céramique (18) sans enlever ou endommager le matériau support sous-jacent, lequel peut comprendre une couche d'accrochage métallique (16).

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