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Metallic alloy nanocomposite for high-temperature structural components and methods of making

a technology of nanocomposite and alloy, which is applied in the direction of metal-working apparatus, transportation and packaging, etc., can solve the problems of inability process failure to produce a homogeneous distribution of particles in the alloy matrix, and the loading of particles in the alloy composite produced by this process is typically limited to less than 2%, so as to achieve a higher volume fraction

Inactive Publication Date: 2005-06-23
GENERAL ELECTRIC CO
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] The present invention meets these and other needs by providing a nanocomposite comprising a plurality of nanoparticles dispersed in a metallic alloy matrix, and a structural component formed from such a nanocomposite. The nanocomposite contains a higher volume fraction of nanoparticle

Problems solved by technology

The introduction of hard dispersoid nanoparticles during the processing of the nanodispersoid-reinforced alloys presents a technical challenge.
While this is a well-established process for oxide-dispersion strengthened (ODS) alloys in iron- and nickel-based alloys (such as, for example, Inconel MA alloys), the process fails to produce a homogeneous of distribution of the particles in the alloy matrix, especially for large components.
In addition, the loading of the particles in the alloy composites produced by this process is typically limited to less than 2% by volume.
Current processes are unable to produce alloy nanocomposites having sufficiently high loadings of nanoparticles.

Method used

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  • Metallic alloy nanocomposite for high-temperature structural components and methods of making
  • Metallic alloy nanocomposite for high-temperature structural components and methods of making
  • Metallic alloy nanocomposite for high-temperature structural components and methods of making

Examples

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example 1

[0031] For the purpose of this example, the alloys Ni-20Cr and Fe-12.5Cr were selected as the nickel-based and iron-based matrix alloy materials, respectively, for the nanocomposite, and yttrium oxide (Y2O3) was selected as the reinforcing dispersoid nanoparticle.

[0032] Prototype nickel-based and iron-based metallic alloy nanocomposites were fabricated by first forming nanocomposite powders by blending −325 mesh (44 micron) of either nickel-based (Ni-20 weight percent Cr) or iron-based (Fe-12.5 weight percent Cr) alloy powder with various volume fractions (ranging from 5 to 10 volume percent) of size yttrium oxide nanopowders (particle sizes ranging from 50-100 nm). The nanocomposite powders were formed using mechanofusion, in which the yttrium oxide powder was mechanically fused or embedded into the metal powder surface. As an alternative to blending, other procedures, such as cryomilling or mechanical alloying, can be employed to make the nanocomposite powder. The nanocomposite p...

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Abstract

A nanocomposite comprising a plurality of nanoparticles dispersed in a metallic alloy matrix, and a structural component formed from such a nanocomposite. The metallic matrix comprises at least one of a nickel-based alloy and an iron-based alloy. The nanocomposite contains a higher volume fraction of nanoparticle dispersoids than those presently available. The structural component include those used in hot gas path assemblies, such as steam turbines, gas turbines, and aircraft turbine. A method of making such nanocomposites is also disclosed.

Description

BACKGROUND OF INVENTION [0001] The invention relates to a nanocomposite comprising a plurality of nanoparticles dispersed in a metallic alloy matrix and structural components comprising such nanocomposites. More particularly, the invention relates to method of making such nanocomposites. [0002] The continuing effort to design and build more powerful and more efficient turbo-machinery, such as gas turbines, steam turbines, and aircraft engines, requires the use of materials having enhanced high temperature performance capabilities. Such performance enhancements require state-of-the-art materials with vastly improved mechanical properties such as strength and creep resistance. [0003] High temperature structural materials can be strengthened in a number of ways such as, for example, grain refinement, solid solution strengthening, precipitate strengthening, composite strengthening, and dispersoid strengthening. One method of strengthening alloys called Orowan strengthening incorporates ...

Claims

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Application Information

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IPC IPC(8): B22F3/16C22C1/05
CPCB22F3/162B22F2009/041B22F2998/00B22F2998/10B22F2999/00C22C1/05B22F9/04B22F3/16B22F1/0018B22F1/054B22F1/056
Inventor SUBRAMANIAN, PAZHAYANNUR RAMANATHANANGELIU, THOMAS MARTINCORDERMAN, REED ROEDERHUANG, SHYH-CHINMARTE, JUDSON SLOANGRAY, DENNIS MICHAELANAND, KRISHNAMURTHYSRINIVASAN, DHEEPAORUGANTI, RAMKUMAR KASHYAPAMANCHERLA, SUNDAR
Owner GENERAL ELECTRIC CO
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