Method for preparing impregnated cathode matrix

A technology of matrix and cathode, applied in the field of preparation of impregnated cathode matrix, can solve the problems of difficult filling of emitting material, difficult and consistent aperture diameter, etc., and achieve the effect of uniform hole size, uniform distribution of holes, and fewer closed pores.

Inactive Publication Date: 2011-04-20
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, after the tungsten powder is pressed, different batches, or even the same batch of the same tungsten sponge matrix in different positions are difficult to achieve uniformity.
[0014] 3. The diameter of the orifice is difficult to achieve consistent, from image 3 This shortcoming can be seen
If the orifice is too large, the emission material evaporates a lot when the cathode is working, which will affect the life of the cathode. If the orifice is too small, it will be difficult to fill in the emission material, and it will affect the area participating in electron emission, which is not conducive to improving the emission current density of the cathode.

Method used

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  • Method for preparing impregnated cathode matrix
  • Method for preparing impregnated cathode matrix
  • Method for preparing impregnated cathode matrix

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Embodiment

[0034] A preparation method for impregnating a cathode substrate, comprising the following steps:

[0035] (1) Heat tungsten powder with a purity of 99.9% and a size of 2-8 microns in a vacuum furnace at 500-1000 degrees Celsius for 1-3 hours for purification;

[0036] (2) The tungsten particles treated in step (1) of different sizes and shapes are prepared into uniform spherical particles with a particle size of 20-50 microns by adopting the particle spray drying powder-making processing technology commonly used in the ceramic preparation process;

[0037] (3) heating the tungsten spherical particle tungsten powder treated in step (2) in a vacuum furnace at 500-1000 degrees Celsius for 1-3 hours for purification;

[0038] (4) Pour the tungsten spherical particle powder processed in step (3) into the rubber sleeve and then tamp or vibrate the tungsten powder particles to form a close-packed structure, and then carry out isostatic pressing; the pressure is 150-250Mpa;

[0039]...

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Abstract

The invention discloses a method for preparing an impregnated cathode matrix and relates to technology of microwave devices. The method is used for preparing a tungsten sponge matrix of an impregnated barium and tungsten cathode. Tungsten particles of different sizes are prepared into uniform spherical particles by particle spray drying powder treating technology, so that the flowability of tungsten powder is enhanced; and after being filled into a rubber sleeve, the treated tungsten powder can be beat, tamped or vibrated to form a close-packed structure, and then the close-packed structure is pressed and sintered to prepare the tungsten sponge matrix. The method is simple and practicable, the prepared impregnated cathode matrix has the advantages of uniform hole size, uniformly distributed holes, few closed holes and the like.

Description

technical field [0001] The invention relates to the technical field of microwave devices, and relates to a method for preparing an impregnated cathode matrix, which is used for preparing a tungsten sponge matrix impregnated with a barium-tungsten cathode. Background technique [0002] The impregnated cathode is composed of a tungsten sponge matrix and an emitting material. The emission material is evenly filled in the pores of the tungsten sponge, and the metal barium reduced from the emission material diffuses continuously along the sponge channel to the surface of the cathode, thereby reducing its surface work function, and the loss of barium on the surface during operation can be continuously get replenished. The tungsten sponge matrix is ​​the carrier of impregnated barium tungsten cathode, and its general preparation process is as follows: [0003] 1. Pretreatment of tungsten powder. [0004] a. Sieve and select tungsten powder with an average particle size of 2-8um,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/04
Inventor 刘燕文田宏朱虹王宇易红霞李玉涛张洪来刘濮琨
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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