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Metallic bondcoat or alloy with a high gamma/gamma' transition temperature and a component

a technology of transition temperature and metal bonding layer, applied in the direction of coatings, mechanical equipment, machines/engines, etc., can solve the problems of only and not being able to achieve requests. only, so as to achieve the effect of increasing the service temperature of the bonding layer, optimizing strength, and not being able to withstand oxidation and/or corrosion attack

Inactive Publication Date: 2013-10-17
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0003]Components for the hot gas path in gas turbines are made from Ni- or Co based materials. These materials are optimized for strength and are not able to withstand oxidation and / or corrosion attack at higher temperatures. Therefore, these kinds of materials must be protected against oxidation by MCrAlY-coatings which can be used as bondcoats for thermal barrier coating (TBC) systems as well. In TBS systems, the MCrAlY coating is needed against hot gas attack on one side and on the other side this coating is needed to adhere the TBC to the substrate. Improving such systems against oxidation will lead to increased bondcoats service temperatures with increased life properties.

Problems solved by technology

These materials are optimized for strength and are not able to withstand oxidation and / or corrosion attack at higher temperatures.
With increasing bondcoat temperatures, these coatings can fail which can lead to spallation of the thermal barrier coating.
These requests can only be achieved by an optimized composition of the bond coat.

Method used

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  • Metallic bondcoat or alloy with a high gamma/gamma' transition temperature and a component
  • Metallic bondcoat or alloy with a high gamma/gamma' transition temperature and a component
  • Metallic bondcoat or alloy with a high gamma/gamma' transition temperature and a component

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Embodiment Construction

[0012]The figures and the description are only embodiments of the invention.

[0013]FIG. 1 shows a perspective view of a rotor blade 120 or guide vane 130 of a turbomachine, which extends along a longitudinal axis 121.

[0014]The turbomachine may be a gas turbine of an aircraft or of a power plant for generating electricity, a steam turbine or a compressor.

[0015]The blade or vane 120, 130 has, in succession along the longitudinal axis 121, a securing region 400, an adjoining blade or vane platform 403 and a main blade or vane part 406 as well as a blade or vane tip 415.

[0016]As a guide vane 130, the vane 130 may have a further platform (not shown) at its vane tip 415.

[0017]A blade or vane root 183, which is used to secure the rotor blades 120, 130 to a shaft or disk (not shown), is formed in the securing region 400.

[0018]The blade or vane root 183 is designed, for example, in hammerhead form. Other configurations, such as a fir-tree or dovetail root, are possible.

[0019]The blade or vane...

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Abstract

A metallic bondcoat with phases of γ and γ′ is provided. The metallic coating or alloy is nickel based. The metallic coating or alloy has γ and γ′ phases and optionally has β-phase. The new addition in nickel based coating stabilizes the phases γ and γ′ at high temperatures leading to a reduction of local stresses.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2011 / 069515 filed Nov. 7, 2011 and claims benefit thereof, the entire content of which is hereby incorporated herein by reference. The International Application claims priority to the U.S. application Ser. No. 12 / 953,531 filed Nov. 24, 2010, the entire contents of which is hereby incorporated herein by reference.FIELD OF INVENTION[0002]The invention relates to a metallic bondcoat with phases of γ and γ′ a component.SUMMARY OF INVENTION[0003]Components for the hot gas path in gas turbines are made from Ni- or Co based materials. These materials are optimized for strength and are not able to withstand oxidation and / or corrosion attack at higher temperatures. Therefore, these kinds of materials must be protected against oxidation by MCrAlY-coatings which can be used as bondcoats for thermal barrier coating (TBC) systems as well. In TBS systems, the MCrAlY coatin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C19/03C22C19/05
CPCC22C19/03C22C19/05C23C4/12F01D5/288F05D2260/95C23C4/073Y02T50/60
Inventor KULKARNI, ANAND A.SHIPPER, JR., JONATHAN E.STAMM, WERNER
Owner SIEMENS AG
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