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A preparation method of a direct-heating type electron-bombardment-resistant cathode

An electron bombardment and direct heating technology, which is applied in the cathode, cold cathode manufacturing, and electrode system manufacturing of time-of-flight electron tubes, can solve the problems of the end of life of the 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: 2018-12-18
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 preparation method of a direct-heating type electron-bombardment-resistant 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 preparation method of a direct-heating electron-bombardment-resistant cathode includes mixing tungsten powder and Y2O3-Gd2O3-HfO2 / ZrO2(Y-Gd-Hf / Zr-O) active material powder to obtain uniformly mixedY-Gd-Hf / Zr-O active material powder; uniformly mixing active material-containing powder with (1.5-3)wt% of a gun cotton solution, applying the mixed solution to the surface of a tungsten wire cathodesubstrate and baking; putting a tungsten wire to the surface of which the active material-containing powder is applied in a high temperature hydrogen furnace, and performing heat preservation at 1500+ / - 50 DEG C for 3 to 10 minutes to prepare a direct-heating type electron-bombardment-resistant cathode. The direct-heating type electron-bombardment-resistant cathode of the invention has relativelygood electron-bombardment resistance, and the emission current density of a pure tungsten wire cathode for a magnetron can be increased, and the working temperature and surface evaporation rate of the pure tungsten wire cathode are reduced, thereby prolonging the lives of the cathode and magnetron are prolonged.

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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IPC IPC(8): H01J9/02H01J23/04C23C24/08
CPCC23C24/085H01J9/02H01J23/04H01J2223/04
Inventor 漆世锴
Owner JIUJIANG UNIVERSITY
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