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Extraction method of filament potting compound for cathode

A perfusion and filament technology, applied in cold cathode manufacturing, electrode system manufacturing, discharge tube/lamp manufacturing, etc., can solve the problem of reducing the quality of filament component potting, reducing the insulation performance of insulating powder, changing the potting and sintering temperature, etc. problem, to achieve good internal and external consistency, avoid short circuit or open circuit, and the effect of suitable melting point

Active Publication Date: 2015-04-22
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional removal method is to mechanically remove the molybdenum cylinder with the help of diagonal pliers, which can easily cause metal elements in the perfusion, reduce the insulation performance of the insulating powder, change the potting and sintering temperature, and then reduce the potting quality of the filament assembly

Method used

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  • Extraction method of filament potting compound for cathode
  • Extraction method of filament potting compound for cathode

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0024] The invention relates to a method for taking out filament perfusion for cathode, comprising the following steps:

[0025] 1) Prepare pickling solution 2, wherein the formula in pickling solution 2 is: 25 g / L sulfuric acid and 50 g / L nitric acid. Pour a certain amount of 500ml of distilled water into the 1L beaker 1, slowly pour the calculated sulfuric acid into it, and stir at the same time, measure out the calculated nitric acid, and add it to the solution while stirring carefully to cool the resulting solution to room temperature.

[0026] 2) Prepare an alkaline solution, wherein the formula in the alkaline solution is: ammonia water 60 g / L. Pour a certain amount of 500ml of distille...

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Abstract

The invention discloses an extraction method of a filament potting compound for a cathode. The method comprises the following steps of 1) preparing a pickling solution, 2) preparing an alkaline solution, 3) etching a molybdenum barrel filled with the potting compound in the pickling solution, 4) performing neutralizing treatment on the etched potting compound in the alkaline solution, 5) washing the potting compound with deionized water and inspecting a PH (Potential of Hydrogen) value, and 6) drying the potting compound in an oven and keeping the potting compound with a drying bottle. The method has the benefits that 1, the surface quality of the potting compound is good, the surface fineness is good and the surface is free from obvious impurities; 2, the potting compound is good in uniformity and good in internal and external consistency; 3, an extraction technology of the filament potting compound for the cathode is high in stability; and 4, a melting point of the potting compound is appropriate and a use requirement of a traveling-wave tube cathode can be met after potting and sintering. The method is applied to a certain air-borne traveling-wave tube at an X band; the on-off times of a filament assembly are greatly increased; a short or open circuit of the filament assembly is avoided; and the service life of the cathode can reach over 15000h.

Description

technical field [0001] The invention relates to a method for taking out a filament filling material for a cathode, and belongs to the technical field of cathode manufacturing of traveling wave tubes. Background technique [0002] The cathode is a key factor affecting the life of a traveling wave tube. When designing the cathode, it is necessary to fully consider many factors such as ion bombardment resistance, high voltage resistance, poisoning resistance, vibration resistance, impact resistance, spark resistance, emission capability, and long life. Among them, vibration resistance is very important to the life of the cathode. Factors affecting the cathode vibration resistance include cathode brazing, spot welding, laser welding, and filament potting and sintering. During the preparation of the filament assembly, the filament needs to be potted and sintered with insulating powder. In the molybdenum cylinder, the quality of the potting determines the insulation and thermal c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/02
CPCH01J9/02
Inventor 孟昭红陈爱民于晨晨卞磊王莹
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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