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Titanium aluminide articles with improved surface finish and methods for their manufacture

A technology of surface modification, titanium aluminide, applied in the field of wax mold casting parts, can solve the problems of high tool processing and labor costs, the sensitivity of alloy ductility cracking hindering the surface modification of cast products, and the delay of preparation.

Active Publication Date: 2014-05-28
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In either case, however, tooling and labor costs are high and lead to delays in preparation
[0006] In addition, the limited ductility and susceptibility to cracking of alloys, including titanium aluminide cast articles, may prevent the improvement of the surface finish of cast articles using conventional grinding and polishing techniques

Method used

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  • Titanium aluminide articles with improved surface finish and methods for their manufacture
  • Titanium aluminide articles with improved surface finish and methods for their manufacture
  • Titanium aluminide articles with improved surface finish and methods for their manufacture

Examples

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Embodiment

[0055] The generally described technology may be more readily understood with reference to the following examples, which are included for the purpose of illustrating certain aspects and embodiments only, and are not intended to limit the systems and methods in any way.

[0056] Roughness values ​​can be calculated on a profile or on a surface. The profile roughness parameters (Ra, Rq...) are more commonly used. Each roughness parameter is calculated using the formula used to describe the surface. There are many different roughness parameters in use, but so far, R a Most used. Other commonly used parameters include R z , R q and R sk .

[0057] The average roughness Ra is expressed in units of height. In the Royal (British) system, 1 Ra is usually expressed as "millionths" of an inch. This is also known as a "microinch". Ra values ​​indicated herein refer to microinches. The amplitude parameter characterizes the surface based on the vertical deviation of the roughness...

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Abstract

Titanium-containing articles having improved surface finishes and methods for improving surface finishes on titanium containing articles are provided. One method includes passing an abrasive medium across a surface of a titanium aluminide alloy-containing article, for example, a turbine blade, at high linear speed; deforming the surface of the titanium aluminide alloy-containing article with the abrasive medium and reducing a surface roughness of the surface of the titanium aluminide alloy-containing article and improving the surface finish of the surface. Surface finishes of 20 microinches Ra or less can be obtained. Though aspects of the invention can be used in fabricating high performance turbine blades, the methods disclosed can be applied to the treatment of any titanium-containing article for which it is difficult to obtain an improved surface finish.

Description

Background of the invention [0001] Modern gas turbines, especially aircraft engines, must meet the highest demands with regard to reliability, weight, power, economy and operating life. In developing aircraft engines, among other things, material selection, research of new suitable materials and research of new production methods play an important role in meeting standards and fulfilling requirements. [0002] Materials used in aircraft engines or other gas turbines include titanium alloys, nickel alloys (also known as superalloys), and high-strength steels. Titanium alloys are commonly used in compressor parts, nickel alloys are suitable for hot parts in aircraft engines, and high-strength steels are used, for example, in compressor casings and turbine casings. Highly loaded or stressed gas turbine components, such as components for compressors, for example, are often forged parts. On the other hand, components for turbines are often embodied as investment cast parts. In o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B1/00B24B19/14C22F1/18F01D5/28
CPCB24B1/00B24B19/14B24B21/165C21D7/04C22F1/183F01D5/28F01D5/286F05D2300/182F05D2300/516Y02T50/60Y10T428/24802
Inventor B.克努森B.P.比莱
Owner GENERAL ELECTRIC CO