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Magnetron-used cathode preparation method

A cathode and tube technology, applied in magnetron, transit time electron tube cathode, cold cathode manufacturing, etc., can solve the problems of oxide cathode, barium tungsten cathode failure, cathode surface bombardment, harsh working environment, etc. The effect of strong resistance to electron bombardment, simple production process and good application potential

Active Publication Date: 2020-01-10
JIUJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a cathode for a magnetron, which solves the problem that the cathode of the existing high-power magnetron operates at a higher temperature and the working environment is relatively harsh during normal operation. The surface is subjected to severe electron and ion bombardment, and the traditional oxide cathode and barium tungsten cathode will fail

Method used

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  • Magnetron-used cathode preparation method
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  • Magnetron-used cathode preparation method

Examples

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preparation example Construction

[0028] A preparation method for a magnetron cathode, such as figure 1 , 2 Shown, this preparation method comprises the following steps:

[0029] (4) Put the processed spiral tungsten wire on the cylindrical liner, and then evenly coat the surface of the spiral tungsten wire covered with the liner with the aluminum oxide suspension, and after each coating, put it in the dryer Dry it under the heat, repeat the above operation until the thickness of the aluminum oxide layer exceeds the diameter of the spiral tungsten wire, take out the liner, and finally put it into a high-temperature hydrogen furnace for sintering to obtain a heat sink with good insulation performance;

[0030] (5) Use a high-pressure spray gun to evenly spray a tungsten powder layer on the surface of the heater, spray and dry it repeatedly, and then sinter it in a high-temperature hydrogen furnace to form a tungsten sponge layer;

[0031] (6) Use a high-pressure spray gun to uniformly spray the electron emiss...

Embodiment 1

[0039] Yttrium zirconate was used as the electron emission active material.

[0040] Put the spiral tungsten wire with a wire diameter of 1.2~1.4mm, a spiral diameter of 8.5~8.7mm, and a spiral length L of 23~27mm on the cylindrical inner container; then evenly coat the surface of the spiral tungsten wire with the inner container. Coated aluminum oxide suspension, the suspension is a weight ratio of 20wt% aluminum oxide powder and 10wt% (1~3)% methanol solution and 70wt% (1~3)% nitrocellulose solution The mixed solution, in which the purity of aluminum oxide powder is 4N, and the average particle size is less than 1 μm; after each coating, it is dried under the dryer, and the above operation is repeated until the thickness of the coated aluminum oxide layer exceeds that of the tungsten spiral The diameter of the wire; take out the liner and put it into a high-temperature hydrogen furnace for sintering. The process is to linearly increase the temperature from room temperature t...

Embodiment 2

[0042] Gadolinium hafnate is used as the electron emission active material.

[0043] Put the spiral tungsten wire with a wire diameter of 1.2~1.4mm, a spiral diameter of 8.5~8.7mm, and a spiral length L of 23~27mm on the cylindrical inner container, and then evenly coat the surface of the spiral tungsten wire with the inner container. Coated aluminum oxide suspension, the suspension is a weight ratio of 20wt% aluminum oxide powder and 10wt% (1~3)% methanol solution and 70wt% (1~3)% nitrocellulose solution The mixed solution, in which the purity of aluminum oxide powder is 4N, and the average particle size is less than 1 μm; after each coating, it is dried under the dryer, and the above operation is repeated until the thickness of the coated aluminum oxide layer exceeds that of the tungsten spiral The diameter of the wire; take out the liner and put it into a high-temperature hydrogen furnace for sintering. The process is to linearly increase the temperature from room temperatu...

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Abstract

The invention discloses a magnetron-used cathode preparation method. The method comprises the following steps: (1) a well-treated spiral tungsten filament sleeves a cylindrical liner, the surface of the spiral tungsten filament sleeving the liner is uniformly coated with aluminum oxide turbid liquid, drying in a drying machine after coating for one time is then carried out, the above operation isrepeated until the thickness of an aluminum oxide layer exceeds the diameter of the spiral tungsten filament, the liner is taken out, and finally, putting in a high-temperature hydrogen furnace for sintering is carried out to obtain a heater with good insulating property; (2) a tungsten powder layer is uniformly sprayed on the surface of the heater by using a high-pressure spraying gun, repeated spraying and drying are carried out, and then, putting in the high-temperature hydrogen furnace for sintering is carried out to form a tungsten sponge layer; and (3) an electron emission active substance is uniformly sprayed on the surface of the tungsten sponge layer by using the high-pressure spraying gun, repeated spraying and drying are carried out, and then, putting in the high-temperature vacuum furnace for sintering is carried out to form a ceramic layer, thereby obtaining the cathode for the magnetron. The cathode prepared by the invention has the advantages of low working temperature,small evaporation, good poisoning resistance and strong electron bombardment resistance.

Description

technical field [0001] The invention relates to a method for preparing a cathode for a magnetron. Background technique [0002] A magnetron is an electric vacuum device used to generate microwave energy. In essence, it is a vacuum diode placed in a constant magnetic field. Under the control of the perpendicular constant magnetic field and constant electric field, the electrons in the tube interact with the high-frequency electromagnetic field, and can convert the energy obtained from the constant electric field into microwave energy, thereby To achieve the purpose of generating microwave energy. At present, the magnetron, as a vacuum electronic device, has been proven to be the most efficient and economical microwave generator for industrial use. As one of the "heart parts" of the magnetron, the quality of the cathode directly affects the output power and life of the magnetron; in the normal working process of a high-power magnetron, its cathode works at a higher temperatu...

Claims

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Application Information

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IPC IPC(8): H01J9/04H01J23/05H01J25/50
CPCH01J9/042H01J23/05H01J25/50H01J2223/05H01J2225/50
Inventor 漆世锴王小霞王兴起高阳查兵刘理曾伟徐梦婷
Owner JIUJIANG UNIVERSITY
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