Post-deposition oxidation of a nickel-base superalloy protected by a thermal barrier coating
AssigneeGeneral Electric Company
InventorRamgopal Darolia
Life of this patent
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Abstract
A nickel-base superalloy protected by a thermal barrier-coating is prepared by depositing a bond coat layer overlying and contacting the substrate, depositing a ceramic layer overlying and contacting the bond coat layer, thereby forming a coated substrate, placing the coated substrate into a heating apparatus operating with an oxidizing atmosphere, and heating the coated substrate in the heating apparatus to a temperature of from about 1850° F. to about 2100° F., for a time of at least about 30 minutes. A layer of alpha alumina is formed on the bond coat layer, between the bond coat layer and the ceramic layer.
Claims20
A method for preparing a nickel-base superalloy article protected by a thermal barrier coating, comprising the steps of
- furnishing a substrate made of a nickel-base superalloy;
- thereafter
- depositing a bond coat layer overlying and contacting the substrate;
- thereafter
- removing any oxide formed on the bond coat layer;
- thereafter
- depositing a ceramic layer overlying and contacting the bond coat layer, thereby forming a coated substrate;
- thereafter
- placing the coated substrate into a heating apparatus operating with an oxidizing atmosphere and an oxygen partial pressure;
- and thereafter
- heating the coated substrate in the heating apparatus to a temperature of from about 1850° F. to about 2100° F., for a time of at least about 30 minutes to form a final article;
- and thereafter
- placing the final article into service in a jet engine.
A method for preparing a nickel-base superalloy article protected by a thermal barrier coating, comprising the steps of
- furnishing a substrate made of a nickel-base superalloy;
- thereafter
- depositing a bond coat layer overlying and contacting the substrate;
- thereafter
- removing any oxide formed on the bond coat layer;
- thereafter
- depositing a ceramic layer overlying and contacting the bond coat layer, thereby forming a coated substrate;
- thereafter
- placing the coated substrate into a heating apparatus operating with an oxidizing atmosphere;
- and thereafter
- heating the coated substrate in the heating apparatus to a temperature of from about 1850° F. to about 2100° F. and a partial pressure of oxygen of from about 10−3 torr to about 10−5 torr, for a time of at least about 30 minutes to form a final article.
A method for preparing a nickel-base superalloy article protected by a thermal barrier coating, comprising the steps of
- furnishing a coated substrate comprising
- a substrate made of a nickel-base superalloy,
- a bond coat layer overlying and contacting the substrate, and
- a ceramic layer overlying and contacting the bond coat layer, wherein the step of furnishing includes the step of removing any oxide that would otherwise be present between the bond coat layer and the ceramic layer;
- thereafter
- placing the coated substrate into a heating apparatus;
- and thereafter
- heating the coated substrate in the heating apparatus to a temperature sufficient to grow a layer comprising primarily alpha alumina between the bond coat layer and the ceramic layer, to produce a final article.
Dependencies are inferred from the claim text.