Impregnated barium tungsten cathode based on tungsten fibre and its preparation method

A barium tungsten cathode and tungsten fiber technology, applied in the field of barium tungsten cathode, can solve the problems of complex process, not long life, and insufficient emission current of impregnated barium tungsten cathode, achieve good process repeatability and stability, and shorten production cycle , The effect of facilitating electron emission

Inactive Publication Date: 2004-10-13
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, it has defects such as complicated process, high difficulty, poor repeatability and stability, and high cost. In addition, with the increasing requirements of high-power electronic tubes, the original traditional impregnated barium-tungsten cathode has insufficient emission current and long life. The disadvantages of high temperature and insufficient work stability are increasingly unable to keep up with the development of the situation

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  • Impregnated barium tungsten cathode based on tungsten fibre and its preparation method
  • Impregnated barium tungsten cathode based on tungsten fibre and its preparation method

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Embodiment Construction

[0021] The impregnated barium tungsten cathode provided by the invention is composed of 10-30% tungsten fiber and 70-90% tungsten powder by weight, and aluminates are impregnated in the pores.

[0022] The method for preparing the above-mentioned impregnated barium tungsten cathode provided by the present invention is:

[0023] 1) Micro-particles, high-purity tungsten powder and high-strength, high-temperature-resistant tungsten fiber are used, and the tungsten powder and tungsten fiber are respectively placed in a 1300°C hydrogen furnace for annealing to thoroughly purify and enhance their plasticity.

[0024] 2) Take 20% tungsten fiber and 80% tungsten powder by weight, mix and grind the two materials and make all fiber ports have a certain directionality to ensure uniformity. The mixture was pressed into a flat-topped cathode body using a die containing a cylinder of molybdenum. The flat top cathode body has a diameter of 2-5mm and a thickness of 1-4mm. The flat top catho...

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Abstract

The invention provides a Wu fiber-based impregnated Ba-Wu cathode, its components in weight percent: Wu fiber 10-30% and Wu powder 79-90% and its hole is impregnated with aluminate. Its preparing method: place Wu fibe and Wu powder 1000-1500 deg.C in hydrogen furnaces for annealing, respectively; in weight percent, take Wu fiber 10-30% and Wu powder the rest to grind and mix uniformly and make all the fiber ports show certain directionality. Use press mould with Mo tube inside to press the mixture into flat-roofed cathode body; place the cathode body in hydrogen furnace: when the temperature reaches 1500-2000 deg.C, preserve heat for 1-10 hours; place in aluminate powder and in a hydrogen atmosphere, to dip for 1-10 minutes at 15000-2000 deg.C, and then eliminate the floating salt by Wu sleave group; install ohmic heating carrier getter to make it.

Description

technical field [0001] The invention relates to a barium tungsten cathode on an electron tube device, in particular to an impregnated barium tungsten cathode based on tungsten fibers. [0002] The present invention also relates to a method for preparing the impregnated barium tungsten cathode. Background technique [0003] The traditional impregnated barium tungsten cathode has the characteristics of low surface work function, large emission current, long life, good working stability, strong resistance to poisoning and ion bombardment, so it is widely used as an electron source in various fields. High-power electronic tube devices, such as klystrons, magnetrons, traveling wave tubes, and high-definition and high-brightness picture tubes. However, it has defects such as complicated process, high difficulty, poor repeatability and stability, and high cost. In addition, with the increasing requirements of high-power electronic tubes, the original traditional impregnated barium...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/20H01J9/02H01J19/06
Inventor 张红卫
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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