Siemens Aktiengesellschaft

Jonathan E Shipper, Jr

Gary Brian Merrill

Ramesh Subramanian

Anand A Kulkarni

Werner Stamm

Cora Schillig

Neil Hitchman

Dimitrios Zois

Cora Hitchman

Delamination of thermal barrier coatings ('TBC's') () from superalloy substrates () of components () for turbine engines (), such as engine blades (), vanes (), or castings in transitions (), is inhibited during subsequent cooling passage () formation. Partially completed cooling passages (), which have skewed passage paths that end at a terminus (), which is laterally offset from the passage entrance (), are formed in the superalloy component () prior to application of the TBC layer(s) (). The skewed, laterally offset path of each partially completed cooling passage () establishes an overhanging shield layer () of superalloy material that protects the TBC layer () during completion of the cooling passage ().

Forming cooling passages in thermal barrier coated, combustion turbine superalloy components

Engineered groove features (EGFs) are formed within thermal barrier coatings (TBCs) of turbine engine components. The EGFs are advantageously aligned with likely stress zones within the TBC or randomly aligned in a convenient two-dimensional or polygonal planform pattern on the TBC surface and into the TBC layer. The EGFs localize thermal stress- or foreign object damage (FOD)-induced crack propagation within the TBC that might otherwise allow excessive TBC spallation and subsequent thermal exposure damage to the turbine component underlying substrate. Propagation of a crack is arrested when it reaches an EGF, so that it does not cross over the groove to otherwise undamaged zones of the TBC layer. In some embodiments, the EGFs are combined with engineered surface features (ESFs) that are formed in the component substrate or within intermediate layers applied between the substrate and the TBC.

Turbine component thermal barrier coating with crack isolating engineered groove features

A metallic coating or alloy is provided. The metallic coating or alloly includes iron, chromium, aluminum, tantalum, and nickel and contains no rhenium. The presence of tantalum and iron and the absence of rhenium are effective to increase a &#x3b3;/&#x3b3;' transition temperature of the alloy. A component including the metallic coating or alloy is also provided.

Metallic bondcoat with a high &#x3b3;/&#x3b3;' transition temperature and a component

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Lake Mary, FL, United States of America

Jonathan E Shipper, Jr