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Method for largely preparing superfine spherical titanium aluminium-based alloyed powder

A technology of base alloy and alloy powder, which is applied in the field of preparation of fine spherical titanium-aluminum base alloy powder, which can solve the problems of TiAl base alloy powder that have not been seen yet, and achieve the effect of fine particle size, high operation stability and strong repeatability

Inactive Publication Date: 2010-10-06
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

At present, there are no relevant reports on the preparation of TiAl-based alloy powders by the above two processes.

Method used

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  • Method for largely preparing superfine spherical titanium aluminium-based alloyed powder
  • Method for largely preparing superfine spherical titanium aluminium-based alloyed powder

Examples

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Embodiment Construction

[0015] Example 1. Using high-purity aluminum with a purity of 99.99%, titanium sponge, Al-Nb master alloy, Ti-B alloy, tungsten powder, and yttrium scrap with a purity of 99.99% as raw materials, it is smelted by a plasma cooling bed furnace melting process Large size ingots with a nominal composition of Ti-45Al-9 (Nb, W, B, Y). The alloy ingot is coarsely crushed by low-temperature cold air chips, the temperature of the compressed nitrogen cold air is -30°C, and the particle size of the chips is about 2mm. The debris was subjected to vortex jet mill grinding, the grinding nitrogen pressure was 0.65Mpa, the rotating speed of the separator was 5800 rpm, and irregular fine alloy powder with an average particle size of 18 μm was collected. The fine alloy powder is subjected to radio frequency plasma spheroidization treatment, the plasma stable power is 35KW, the flow rate of argon working gas is 23 slpm, the flow rate of argon protective gas is 155 slpm, and the system negative p...

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Abstract

The invention provides a method for largely preparing superfine spherical titanium aluminium-based alloyed powder, which belongs to the technical field of powder preparation. The method comprises the following steps: smelting high-purity aluminium and titanium sponge as main raw materials and Al-Nb intermediate alloy, Ti-B alloy, tungsten powder and high-purity yttrium scraps as auxiliary raw materials into an alloy cast ingot in a vacuum consumable electrode arc skull furnace or a vacuum induction furnace; then carrying out coarse crushing and vortex airflow milling to prepare irregular superfine alloy powder; and finally carrying out plasma spheroidization of radio frequency (RF) and the like to prepare the superfine spherical titanium aluminium-based alloyed powder. The prepared alloy powder has the advantages of high purity, fine particle size, narrow particle size distribution, good uniformity, high sphericity, good flowability and the like and can meet the demands of the technical industrial production of injection forming, gel injection molding forming, thermal spraying and the like.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, and in particular provides a method for preparing fine spherical titanium-aluminum-based alloy powder. technical background [0002] TiAl-based alloys have the advantages of low specific gravity, good high-temperature strength, oxidation resistance, and excellent creep resistance. They are considered to be the most promising new generation of lightweight superalloys. Environmental protection and other technical fields have very broad application and development prospects. However, TiAl alloys generally have problems such as low ductility at room temperature, difficulty in plastic forming, and high preparation costs, which limit their development and application. Among many material preparation processes, powder metallurgy preparation technology can not only obtain uniform fine-grained structure, but also directly prepare parts with or close to the final shape, which has become one of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04C22C1/03
Inventor 何新波王述超路新盛艳伟朱郎平曲选辉
Owner UNIV OF SCI & TECH BEIJING
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