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Dipped barium wolfram cathode and process for its manufacture

A technology of barium tungsten cathode and cathode body, applied in the field of impregnated barium tungsten cathode and preparation of the above impregnated barium tungsten cathode, can solve the problems of complicated process, not long enough life, insufficient emission current of the impregnated barium tungsten cathode, etc., and achieves process repeatability and good stability, shorten the production cycle, and facilitate the effect of electron emission

Inactive Publication Date: 2009-07-08
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Claims
  • Application Information

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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

Method used

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  • Dipped barium wolfram cathode and process for its manufacture

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Embodiment Construction

[0031] The flat top cathode body prepared by the present invention has a diameter of 3.6mm and a thickness of 2mm.

[0032] Process 1:

[0033] 1) Put the iridium powder, rhenium powder and tungsten powder into a hydrogen furnace at 1000°C for annealing to thoroughly purify and enhance their plasticity.

[0034] 2) Take by weighing 10 grams of iridium powder, 15 grams of rhenium powder, and 20 grams of tungsten powder, (all converted to 100%, the purity of iridium powder is 95%, the purity of rhenium powder is 96.2%, and the purity of tungsten powder is 95.2% ), grind the three materials to 300 mesh, mix them evenly, take 0.2 g of the mixture, and press it into a cathode body with a die with a molybdenum cylinder inside.

[0035] 3) Put the cathode body prepared in step 2 into a hydrogen furnace, and keep it warm for 5 hours when the temperature reaches 1700°C.

[0036] 4) Place the cathode body prepared in step 3 in aluminate powder, immerse in a hydrogen atmosphere at 1500...

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Abstract

This invention discloses one dipping barium-tungsten cathode with multi functions and its process method, wherein, the cathode comprises addictive, molybdenum cylinder, heater, aluminates; the addictive is composed of iridium powder ruthenium powder and tungsten powder. The process method comprises the following steps: annealing the metal powder and weighting three materials less than 200 for mixing and using molybdenum powder mode to process cathode; heating to 1500-2000 degree less than one hour; putting it into aluminates powder for dipping for 0.5 to 10 minutes in 1500 to 2000 degrees.

Description

technical field [0001] The invention relates to a barium tungsten cathode on an electronic tube device, in particular to an impregnated barium tungsten cathode containing iridium rhenium tungsten additive. [0002] The present invention also relates to a method for preparing the impregnated barium tungsten cathode. Background technique [0003] Compared with other cathodes, 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 as an electron source, Widely used in various 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/14H01J1/20H01J19/06H01J9/02
Inventor 吴华夏方卫沈旭东张红卫
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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