A kind of preparation method of direct heating type anti-electron bombardment cathode

A technology of electron bombardment and direct heating, which is applied in the direction of cathode, cold cathode manufacturing, and electrode system manufacturing of time-of-flight electron tubes. It can solve the problems of the end of life of pure W wire cathode magnetron and achieve high resistance to electron bombardment. ability, high thermal emission current density, and the effect of reducing evaporation rate

Active Publication Date: 2021-07-13
JIUJIANG UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a direct-heating electron bombardment-resistant cathode, which solves the problem that the end of the life of the pure W wire cathode in the medium and high-power continuous wave magnetron leads to the end of the life of the magnetron, and has the advantages of To increase the emission current density of the pure W wire cathode, reduce the operating temperature of the cathode, and prolong the service life of the cathode

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  • A kind of preparation method of direct heating type anti-electron bombardment cathode
  • A kind of preparation method of direct heating type anti-electron bombardment cathode
  • A kind of preparation method of direct heating type anti-electron bombardment cathode

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preparation example Construction

[0020] A kind of preparation method of direct heating type anti-electron bombardment cathode, such as Figure 1-5 shown, including steps:

[0021] a. Set Y 2 o 3 、Gd 2 o 3 , HfO 2 / ZrO 2 Y 2 o 3 、Gd 2 o 3 and HfO 2 / ZrO 2 mixed powder and pressed into blocks;

[0022] b. Put the block obtained in step a into a muffle furnace, and sinter at 1450±50° C. for 1 to 4 hours to synthesize Y-Gd-Hf / Zr-O refractory oxide active material;

[0023] c, grinding the refractory oxide block of Y-Gd-Hf / Zr-O obtained in step b for not less than 3 hours;

[0024] d. Mix the Y-Gd-Hf / Zr-O refractory oxide active material obtained in step c with metal tungsten powder, pour it into an agate bowl and grind it well, and obtain a uniformly mixed Y-Gd-Hf / Zr- O active substance powder;

[0025] e. Evenly mix the Y-Gd-Hf / Zr-O active material powder obtained in step d with 1.5-3wt% nitrocellulose solution, apply the mixed solution to the surface of the tungsten wire cathode substrate, and pl...

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Abstract

A method for preparing a direct-heating electron bombardment-resistant cathode, the method comprising: metal tungsten powder and Y 2 o 3 -Gd 2 o 3 -HfO 2 / ZrO 2 (Y-Gd-Hf / Zr-O) active substance powders are mixed to obtain uniformly mixed Y-Gd-Hf / Zr-O active substance powders; Mix the cotton solution evenly, apply the mixed solution on the surface of the tungsten wire cathode substrate, and bake it; put the tungsten wire coated with active substance powder on the surface into a high-temperature hydrogen furnace, and keep it warm at 1500±50°C for 3 to 10 minutes. A directly heated cathode resistant to electron bombardment was prepared. The direct-heating electron bombardment-resistant cathode of the present invention has better resistance to electron bombardment, and the cathode can increase the emission current density of the pure tungsten wire cathode for a magnetron, reduce the working temperature and surface evaporation rate of the pure tungsten wire cathode, Thereby prolonging the life of the cathode and the magnetron.

Description

technical field [0001] The invention relates to a preparation method of a direct-heating electron bombardment-resistant cathode. Background technique [0002] At present, magnetrons are developing towards high output power. Ordinary barium tungsten cathodes, oxide cathodes, etc. are not resistant to electron and ion bombardment, are not resistant to anode high voltage, and are prone to ignition. application in magnetrons. Therefore, in medium and high power continuous wave magnetrons with high anode voltage, the directly heated pure tungsten (W) wire cathode with weak emission ability has been widely used. Compared with ordinary oxide cathodes and barium tungsten cathodes, pure W wire cathodes have the advantages of high emission stability, strong resistance to electron and ion bombardment, and strong resistance to poisoning. However, in the case of normal output power, the cathode of medium and high-power continuous wave magnetron generally works at a temperature above 24...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/02H01J23/04C23C24/08
CPCC23C24/085H01J9/02H01J23/04H01J2223/04
Inventor 漆世锴
Owner JIUJIANG UNIVERSITY
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