A kind of glass tube vacuum packaging method of traveling wave tube cathode

Abstract

The invention discloses a glass tube vacuum packaging method for traveling wave tube cathode, comprising the following steps: (1) taking a glass tube with a large end and a small end, preheating and drying; (2) placing protective nets, cathode components or active substances in Into the big end of the glass tube, the cathode part or the active material are fixed on both sides by protective nets respectively; (3) The end face of the big end of the glass tube is closed under the protection of the protective gas; (4) The small end of the glass tube is sealed with a vacuum exhaust (5) seal off the glass tube on the vacuum exhaust stage to complete the vacuum packaging of the cathode component or active material by the glass tube; the present invention carries out vacuum packaging for the cathode component or active material, The cathode parts or active materials are isolated from the outside world, to prevent the cathode parts or active materials from being affected by external factors, to ensure the performance of the cathode parts or active materials, to further ensure the performance of the traveling wave tube, and to meet the preparation needs of the cathode of the traveling wave tube.

Description

technical field [0001] The invention relates to the field of manufacturing cathodes of traveling wave tubes in microwave vacuum devices, in particular to a glass tube vacuum packaging method for the cathodes of traveling wave tubes. Background technique [0002] The cathode is a key component that affects the life of the traveling wave tube. When manufacturing the cathode, it is necessary to fully consider the importance of poisoning resistance to the performance of the cathode. The main factors affecting the cathode poisoning resistance are oxygen and water vapor in the environment, and it is difficult to ensure the continuity of the process during the cathode preparation process, which prolongs the time for the cathode to be exposed to the atmosphere, which is likely to cause the oxidation of cathode parts and active substances. damp phenomenon. The oxidized parts adsorb a large amount of gas, and the adsorbed gas can be separated out again in the vacuum state inside the ...

AI Technical Summary

Problems solved by technology

The main factors affecting the cathode poisoning resistance are oxygen and water vapor in the environment, and it is difficult to ensure the continuity of the process during the cathode preparation process, which prolongs the time for the cathode to be exposed to the atmosphere, which is likely to cause the oxidation of cathode parts and active substances. Damp phenomenon

The oxidized parts adsorb a large amount of gas, and the adsorbed gas can be separated out again in the vacuum state inside the traveling wave tube, which becomes the source of outgassing, which reduces the vacuum degree of the whole tube and easily causes cathode poisoning; affects the normality of the cathode Working or not working properly, greatly reducing the service life of the whole tube

[0003] The cathode matrix of conventional barium tungsten cathodes is usually made of pure tungsten. When metal tungsten encounters water vapor, a water cycle reaction occurs, which also makes it difficult for the cathode to activate and emit normally. The active material impregnated in the cathode tungsten sponge is also very easy to absorb water vapor. Water vapor cannot be eliminated during aging, which also causes cathode poisoning, which in turn affects the performance of the traveling wave tube

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