Method for preparing impregnated cathode matrix

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,...

AI Technical Summary

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.

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