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Impregnated barium-tungsten cathode solder and method for using same

A technology of barium tungsten cathode and brazing filler metal, which is applied in the direction of welding/cutting medium/material, welding medium, manufacturing tools, etc. It can solve the problems of Mo tube cracking, low cathode yield, and shedding, etc., and achieve long service life and stability Good performance and low vapor pressure

Inactive Publication Date: 2008-12-17
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Laser beam welding was also used, but due to improper use of shielding gas, the Mo cylinder was cracked, brittle, and even fell off.
Whether it is electron beam welding or laser beam welding, it is necessary to maintain a close fit between the welded mother bodies, otherwise the Mo cylinder will first melt and shrink, and cannot be welded firmly.
And after welding, it is difficult to ensure that the W base and the Mo cylinder are tightly bonded everywhere, although the surface of the two is well welded
Due to the above reasons, the cathode yield is low due to improper welding. At the same time, the cathode can not adapt to complex weather and terrain, and the service life is not long.

Method used

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  • Impregnated barium-tungsten cathode solder and method for using same

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Embodiment Construction

[0023] The cathode body prepared by the present invention has a diameter of 3.6mm and a thickness of 2mm.

[0024] Process 1:

[0025] 1) Put the palladium powder, tungsten powder and cobalt powder into a 500°C hydrogen furnace for annealing to thoroughly purify and enhance their plasticity.

[0026] 2) Take by weighing 1 gram of palladium powder, 10 gram of tungsten powder, 40 gram of cobalt powder, (all converted into 100%, the purity of palladium powder is 95.4%, the purity of tungsten powder is 95.2%, the purity of cobalt powder is 95.5% ), the three materials are ground to 300 mesh, mixed and pressed;

[0027] 3) Spread the solder on the junction of the non-emitting surface W-base and the molybdenum cylinder, with a thickness of 2-3 mm. Put the coated cathode into the hydrogen furnace, raise the temperature to 1600°C and keep it for 120 seconds, and then lower it to 1000°C. Keep warm for 3 minutes and cool to room temperature;

[0028] 4) Place the cathode body prepare...

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Abstract

The invention discloses an impregnated barium tungsten cathode brazing filler metal and its use method. The brazing filler metal is composed of palladium powder, tungsten powder and cobalt powder. 100% cobalt powder = 1:5-40:10-90, the purity of the palladium powder, tungsten powder, and cobalt powder is 95-100%, and the use methods include material annealing, grinding, pressing, welding, salt immersion, etc. Compared with the prior art, the present invention has firm welding, low vapor pressure and long service life, and the prepared cathode has very good stability, and can adapt to various complex weathers and terrains, and is especially suitable for multi-injection microwave tubes.

Description

technical field [0001] The invention relates to a cathode brazing material on an electron tube device and a method for using the same, in particular to an impregnated barium-tungsten cathode and a method for using the same. Background technique [0002] As an electron source, barium tungsten cathodes are widely used in various microwave devices. In its production process, the welding between the W-based sponge and the molybdenum cylinder (Mo cylinder) supporting it is an essential process to complete the cathode as a whole. Electron beam welding is very expensive and uneconomical. Laser beam welding was also used, but due to improper use of shielding gas, the mold cylinder was cracked, brittle, and even fell off. Whether electron beam welding or laser beam welding is used, it is necessary to maintain a close fit between the welded mother bodies, otherwise the Mo cylinder will first melt and shrink, and cannot be welded firmly. And after welding, it is difficult to ensure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/32B22F3/02B23K1/00
Inventor 吴华夏方卫沈旭东张红卫
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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