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A kind of preparation method of fine spherical tungsten powder

A technology of spheroidizing tungsten powder and ultra-fine tungsten powder, which is applied in the field of powder metallurgy powder preparation, can solve the problems of particle growth and difficulty in making spherical tungsten powder, and achieve good dispersion, smooth surface and uniform particle size distribution. Effect

Inactive Publication Date: 2011-11-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, the preparation of spherical tungsten powder at home and abroad mainly adopts the radio frequency plasma spheroidization method. The tungsten powder prepared by this method has a high degree of sphericity. After the particles grow up, it is difficult to produce spherical tungsten powder with a particle size of less than 10 μm

Method used

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  • A kind of preparation method of fine spherical tungsten powder
  • A kind of preparation method of fine spherical tungsten powder
  • A kind of preparation method of fine spherical tungsten powder

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Experimental program
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Effect test

Embodiment approach 1

[0022] This embodiment is to prepare spherical tungsten powder with an average particle diameter of 5 μm:

[0023] The average particle size of raw tungsten powder is irregular tungsten powder with an average particle size of 5.184. During the dispersion process, the grinding chamber pressure is 0.7 MPa, the sorting wheel speed is 5000 rpm, and the powder feeding rate is 5 kg / hour; the input power during the spheroidization process is 55KW , The system maintains a 1000mm water column, the powder feeding gas flow is 5 slpm, the working gas flow is 30 slpm, the shielding gas flow is 60 slpm, the powder feeding rate is 20 g / min, the working gas is nitrogen during the dispersion process, and it works during the spheroidization process The gas, powder feeding gas and protective gas are all argon gas.

Embodiment approach 2

[0025] This embodiment is to prepare spherical tungsten powder with an average particle diameter of 3 μm:

[0026] The raw material tungsten powder has an irregular tungsten powder with an average particle size of 2.917, the grinding chamber pressure during the dispersion process is 0.7 MPa, the sorting wheel speed is 5500 rpm, and the powder feeding rate is 5 kg / h; the input power during the spheroidization process is 55 KW , The system maintains a 1000mm water column, the powder feeding gas flow is 5 slpm, the working gas flow is 30 slpm, the shielding gas flow is 70 slpm, the powder feeding rate is 20 g / min, the working gas is nitrogen during the dispersion process, and it works during the spheroidization process The gas, powder feeding gas and protective gas are all argon gas.

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Abstract

The invention belongs to the field of powder metallurgy powder preparation and provides a preparation method of fine spherical tungsten powder. By combining the dispersion and classification of tungsten powder with spheroidization, spherical tungsten powder with a particle size below 10 μm is prepared. The specific process is: disperse and classify the irregularly shaped raw material tungsten powder through the impact of airflow, and then spheroidize the dispersed powder through a radio frequency plasma torch to obtain a fine spherical tungsten powder with a particle size below 10 μm. The invention has the advantages that the combination of airflow impact and radio frequency plasma spheroidization solves the problem that the spherical powder obtained by single radio frequency plasma spheroidization is easy to grow, and the production efficiency is high. The obtained powder has a high degree of sphericity, a particle size of less than 10 μm, a spheroidization rate of 100%, a smooth surface, uniform particle size distribution, and good dispersion.

Description

[0001] technical field [0002] The invention belongs to the field of powder metallurgy powder preparation, and in particular provides a preparation method of fine spherical tungsten powder. Background technique [0003] In recent years, with the development of science and technology, new special requirements have been put forward for the raw material tungsten powder. Spherical tungsten powder is widely used in powder metallurgy processes such as the preparation of porous tungsten materials, thermal spraying and injection molding due to its excellent characteristics. Porous tungsten prepared with spherical tungsten powder has more uniform pores, and is gradually replacing conventional tungsten powder to make porous tungsten parts, such as the cathode of high-power pulsed microwave tubes and the barium tungsten cathode of electronic tubes. [0004] Filters for poles, metals such as molten Zn, Al, Mg, Bi, Hg, sweating materials for rockets, catalysts or catalyst carriers,...

Claims

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Application Information

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IPC IPC(8): B22F1/00
Inventor 秦明礼曲选辉黄化李睿
Owner UNIV OF SCI & TECH BEIJING
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