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Braze alloy composition with enhanced oxidation resistance and methods of using the same

a technology of oxidation resistance and alloy composition, which is applied in the direction of manufacturing tools, welding/cutting media/materials, and manufacturing tools, etc., can solve the problems of high-temperature components, turbines, and may experience degradation or durability issues

Inactive Publication Date: 2009-02-12
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a braze alloy composition and a method for repairing or reconstructing a superalloy component. The braze alloy composition includes cobalt, chromium, nickel, tungsten, tantalum, carbon, zirconium, titanium, boron, silicon, and cobalt. The method involves forming a presintered preform by mixing a hardface alloy powder with the braze alloy, sintering the preform to make a sintered component, shaping the sintered component, welding the sintered component to the superalloy component, and subjecting the combination to a heat treatment cycle. The technical effect of this patent is to provide a reliable and effective method for repairing or reconstructing superalloy components that allows for improved durability and performance.

Problems solved by technology

Components in a high-temperature or extreme environment, such as a hot-gas-path airfoil in a gas turbine, may experience degradation or may have issues relating to durability.

Method used

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  • Braze alloy composition with enhanced oxidation resistance and methods of using the same
  • Braze alloy composition with enhanced oxidation resistance and methods of using the same
  • Braze alloy composition with enhanced oxidation resistance and methods of using the same

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Embodiment Construction

[0013]The present invention generally relates to a braze alloy composition that may have enhanced oxidation resistance at elevated temperature.

[0014]In certain embodiments, there is a braze alloy composition having an enhanced resistance to oxidation at elevated temperature. As an exemplary starting point, commercially available Mar M 509B braze powder may be used as a baseline composition for the development of a braze alloy in accordance with an embodiment of this invention. If compared with Mar M 509B, there may be an additional (e.g., 5%) silicon and additional (e.g., 2%) boron content. The silicon content in certain embodiments of the inventive composition may provide advantageous oxidation resistance. The elevated concentrations of silicon and boron content may facilitate the lowering of the melting point for the composition. The boron content in certain embodiments of the inventive composition may facilitate bonding between a pre-sintered preform (PSP) and superalloy hardware...

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Abstract

A cobalt-based braze alloy composition comprises: 22 to 24.75% chromium by weight; 9 to 11% nickel by weight; 6.5 to 7.6% tungsten by weight; 3 to 4% tantalum by weight; 0.55 to 0.65% carbon by weight; 0.3 to 0.6% zirconium by weight; 0.15 to 0.3% titanium by weight; 1.5 to 2.6% boron by weight; 1 to 10% silicon by weight; and cobalt. There are also provided methods of using the same.

Description

BACKGROUND OF THE INVENTION[0001]The present invention generally relates to a braze alloy composition that may have enhanced oxidation resistance at elevated temperature.[0002]Components in a high-temperature or extreme environment, such as a hot-gas-path airfoil in a gas turbine, may experience degradation or may have issues relating to durability. One method of repairing such superalloys may involve pre-sintered performs based upon braze alloys and / or superalloy metallic powders.[0003]The present invention relates to a braze alloy that may be mixed with superalloy metallic powders to form pre-sintered preforms (PSPs). PSPs may be used in a variety of salvage and / or repair applications, such as those involving the repair and / or reconstruction of components incorporated into high-temperature applications.[0004]Braze powders are generally known in the art. One braze powder is Mar M 509B. Mar M 509B is a cobalt-based braze alloy with a boron additive.[0005]The formulation of a PSP pla...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B22F1/00C22C19/07C22C30/00
CPCB23K35/3046C22F1/10C22C19/07
Inventor SATHIAN, SUJITHMURPHY, GENE A.
Owner GENERAL ELECTRIC CO
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