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Preparation method of high-density rare earth tungsten electrode

A rare earth tungsten, dense technology, used in circuits, discharge tubes, electrical components, etc., can solve the problems of complex shapes, inability to prepare large sizes, etc., to achieve a large increase in density, save packaging costs and preparation time, and maximum temperature. high effect

Active Publication Date: 2020-02-14
BAOJI JING LONG TUNGSTEN & MOLYBDENUM CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies and defects of the prior art, the present invention aims to provide a method for preparing a high-density rare-earth tungsten electrode, which overcomes the problem that the traditional method cannot prepare large-sized and complex-shaped rare-earth tungsten electrodes.

Method used

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  • Preparation method of high-density rare earth tungsten electrode
  • Preparation method of high-density rare earth tungsten electrode
  • Preparation method of high-density rare earth tungsten electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example prepares a W-2%La with a relative density of more than 99.5% and a mass content of lanthanum oxide of 2%. 2 o 3 Alloy electrodes, the doping method is liquid-solid doping, the size is Φ40×1000mm, such as figure 2 As shown, the specific steps are as follows:

[0038] (1) The raw material powder W-2% La with a particle size of 2.0 μm 2 o 3 Crushing is carried out with a jet crusher, the rotating speed of the classifying wheel is 60 Hz, and the particle size of the powder after crushing is 1.9 μm.

[0039] (2) Put the crushed powder into a cold isostatic pressing mold for cold isostatic pressing, the pressure of cold isostatic pressing is 210MPa, and the holding time is 20min.

[0040] (3) The blank obtained in step (2) is sintered with a medium-frequency induction heating furnace; the sintering is carried out under a hydrogen atmosphere, and the hydrogen flow rate is 30m 3 / h, the heating rate of the whole temperature section is 70°C / h, and the temperat...

Embodiment 2

[0044] This example prepares a T-type W-2%Th with a relative density of more than 99.5% and a mass content of thorium oxide of 2%. 2 o 3 Alloy electrode, the doping method is mechanical mixing method, the overall size is Φ260×550mm, such as image 3 As shown, the specific steps are as follows:

[0045] (1) The raw material powder W-2% Th with a particle size of 2.0 μm 2 o 3 Crushing is carried out with a jet crusher, the rotating speed of the classifying wheel is 60 Hz, and the particle size of the powder after crushing is 1.9 μm.

[0046] (2) Put the crushed powder into a cold isostatic pressing mold for cold isostatic pressing, the pressure of cold isostatic pressing is 220MPa, and the holding time is 20min.

[0047] (3) The blank obtained in step (2) is sintered with a medium-frequency induction heating furnace; the sintering is carried out under a hydrogen atmosphere, and the hydrogen flow rate is 30m 3 / h, the heating rate of the whole temperature section is 80°C / h, ...

Embodiment 3

[0051] This example prepares a W-2%La with a relative density of more than 99.5% and a mass content of lanthanum oxide of 2%. 2 o 3 Alloy electrodes, the doping method is liquid-solid doping, the size is Φ40×1000mm, such as figure 2 As shown, the specific steps are as follows:

[0052] (1) The particle size is 2.0μm raw material powder W-2% La 2 o 3 Crushing is carried out with a jet crusher, the rotating speed of the classifying wheel is 60 Hz, and the particle size of the powder after crushing is 1.9 μm.

[0053] (2) Put the crushed powder into a cold isostatic pressing mold for cold isostatic pressing to obtain a billet; the pressure of cold isostatic pressing is 210 MPa, and the holding time is 20 minutes.

[0054] (3) The blank obtained in step (2) is sintered with a medium-frequency induction heating furnace; the sintering is carried out under a hydrogen atmosphere, and the hydrogen flow rate is 30m 3 / hour, the heating rate of the whole temperature section is 70℃ / ...

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Abstract

The invention discloses a preparation method of a high-density rare earth tungsten electrode. The method comprises the following steps of pretreatment, selecting raw material powder meeting requirements, and carrying out crushing treatment; pressing and forming, carrying out press forming treatment on the powder obtained in the pretreatment step to obtain a pressed blank; sintering, carrying out sintering treatment on the pressed blank to obtain a sintered blank; and hot isostatic pressing, carrying out hot isostatic pressing treatment on the sintered blank to obtain the high-density rare earth tungsten electrode. The preparation method has the advantages that the steps are well matched, the overall synergistic effect is obvious, the operation steps are simple and feasible, large-batch production is facilitated, the density of the prepared rare earth tungsten electrode product reaches 99.5% or above, the purity is high, the internal tissue structure is uniform, the grain size is fine,the strength is high, and the preparation method is suitable for mass production.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a process technology for preparing high-density tungsten, in particular to a method for preparing a high-density rare earth tungsten electrode. The prepared product can be used for large-scale high-power lasers, large-scale plasma generators, etc. . Background technique [0002] Tungsten has a high melting point (3650K), strong electron emission capability, high elastic modulus, low vapor pressure, and good high-temperature strength, so it has been used as a thermal electron emission material for a long time, but the electron work function of pure tungsten electrodes is high (4.55eV ), the resistance to burning loss is poor, and it is easy to recrystallize at high temperature to form equiaxed grains and grow up, which reduces its resistance to deformation. Adding some rare earth oxides to tungsten can not only overcome these shortcomings, but also refine the grains and improve its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04B22F3/04B22F3/10B22F3/15H01J37/32
CPCB22F9/04B22F3/04B22F3/1007B22F3/15H01J37/3255B22F2009/044B22F2998/10B22F1/052Y02E60/50
Inventor 董建英钟铭杨义兵吴孟海王二卫阚金锋
Owner BAOJI JING LONG TUNGSTEN & MOLYBDENUM CO LTD
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