Method for preparing high niobium containing titanium aluminium alloy powder

A high-niobium titanium-aluminum, pre-alloyed powder technology, applied in the field of powder metallurgy, can solve the problems of tissue sensitivity, easy pollution, and inability to maintain purity, and achieve the effect of good sphericity and high purity

Inactive Publication Date: 2008-09-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

TiAl alloy is a high melting point active metal, and is very sensitive to the structure, it is easy to contaminate when melting in the crucible, and the purity cannot be maintained

Method used

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  • Method for preparing high niobium containing titanium aluminium alloy powder
  • Method for preparing high niobium containing titanium aluminium alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use plasma cooling bed process to melt high-niobium titanium-aluminum ingot, keep it at 1200°C for 24 hours, and carry out soaking treatment; then remove the surface oxide scale of the ingot; use the wire cutting method to process the ingot into a diameter that can be connected It is a bar with a length of 20mm and a length of 220mm, and then it is turned to remove the iron oxide scale on the surface of the bar; the bar is made into powder by a continuous inert gas atomization process without crucible induction heating, and the process parameters are inert gas pressure 3.0MPa, argon Flow 180Ls -1 . The sphericity of the prepared powder reaches 92%, and the powder yield is 85%. When the particle size is -200 mesh, the oxygen content in the alloy powder is 1150ppm.

Embodiment 2

[0026] The high-niobium titanium-aluminum alloy is smelted by the consumable solidification process to make a round bar billet with a diameter of 30mm and a length of 150mm, and then the surface oxide skin of the billet is removed, and the billet is processed into a diameter of 25mm and a length that can be connected. The bar is 140mm; the bar is made into powder by induction heating continuous inert gas atomization process without crucible, the process parameters are inert gas pressure 3.0MPa, argon flow rate 200L s -1 . The sphericity of the prepared powder reaches 93%, and the powder yield is 87%. When the particle size is -200 mesh, the oxygen content in the alloy powder is 1200ppm.

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Abstract

The invention pertains to the field of powder metallurgy technology, in particular to a preparation method of high-niobium titanium aluminum alloy powder. The raw material adopts a casting-state high-niobium titanium aluminum alloy cast ingot, the process comprises: melting - soaking treatment - turning - machining into a rod which can be connected - continuous inert gas atomization method by induction heating without a crucible, the preparation method comprises the specific steps of: (1) melting by adopting the plasma cooling bed process; (2) carrying out the soaking treatment by keeping the temperature at 1100 to 1300 DEG C for 24 to 48 hours; then removing the oxide scale on the surface of the cast ingot; (3) adopting the wire cutting and machining methods to process the cast ingot into the rod which has thread connection, the diameter of 20 to 25mm and the length of 200 to 500mm, and then carrying out turning to remove the oxide scale on the surface of the rod; (4) adopting the continuous inert gas atomization process by induction heating without the crucible to process the rod into the powder, and the process parameters are that the pressure of the inert gas is 2.0 to 5.0MPa and the argon gas flow rate is 160 to 220Ls <-1>. The preparation method has the advantages of excellent degree of sphericity of the prepared powder, high purity, great mobility and high yielding rate of the powder. The degree of sphericity of the prepared powder achieves 80 to 95 percent, and the yielding rate of the powder is 75 to 85 percent.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular provides a preparation method of high-niobium titanium-aluminum alloy powder. Specifically, a high-niobium-titanium-aluminum alloy ingot is used as a raw material to prepare a powder by adopting a crucible-less induction heating continuous inert gas atomization process. Background technique [0002] In order to improve the working efficiency of aviation and aerospace vehicles, it is necessary to increase the thrust and save fuel, increase the working temperature of the engine and reduce the weight of the aircraft. Therefore, the material selection of aviation and aerospace engines should have the characteristics of "lighter, stiffer, stronger and more heat-resistant". Intermetallic compound materials with low density, high melting point, high elastic modulus, and certain plasticity have attracted extensive attention in the past two decades, and have become one of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
Inventor 曲选辉赵丽明何新波王衍行陈国良
Owner UNIV OF SCI & TECH BEIJING
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