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A kind of explosive graphene electron cathode and production method thereof

A technology of electronic cathode and production method, which is applied in the field of explosive graphene electronic cathode and its production, can solve the problems of many pulse waveform burrs, unsatisfactory pulse waveform, unfavorable electron beam modulation and application, etc., and achieve pulse current waveform without burr , launch rising and falling time is short, easy to industrialized production effect

Inactive Publication Date: 2018-12-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of explosive cathode has defects such as unsatisfactory pulse waveforms and more pulse waveform glitches, which are not conducive to the modulation and application of electron beams.

Method used

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  • A kind of explosive graphene electron cathode and production method thereof
  • A kind of explosive graphene electron cathode and production method thereof
  • A kind of explosive graphene electron cathode and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]Embodiment 1: In this embodiment, the traditional stainless steel cathode is used as the basic cathode as an example, and the method is as follows:

[0030] Step 1. Preparation of graphene oxide: Put 1g of expandable graphite in a high-temperature muffle furnace and heat it at 900°C for 10 minutes to fully expand the expandable graphite to obtain nano-graphite sheets with a thickness of <100nm; The sheet is placed in a stirrer, and potassium permanganate and concentrated sulfuric acid are added to carry out intercalation oxidation to the nano-graphite sheet under stirring conditions, the nano-graphite sheet: potassium permanganate: concentrated sulfuric acid=1.0g:4g:100ml; intercalation The oxidation time is 12 hours to obtain graphene oxide;

[0031] Step 2. Preparation of a suspension containing impurities and powdery graphene oxide: the graphene oxide obtained in step 1 is removed with deionized water to remove residual acid, and the graphene oxide after acid removal ...

Embodiment 2

[0039] In this embodiment, the traditional graphite cathode is used as the basic cathode as an example: steps 1-4 are the same as in Example 1;

[0040] Step 5. Add magnesium nitrate to the graphene oxide powder obtained in step 4, graphene oxide: magnesium nitrate=1:0.8, add ethanol after mixing, and configure the graphene oxide electrophoretic liquid with a concentration of 60mg / ml;

[0041] Step 6. Prepare the explosive graphene electron cathode body: Insert the traditional graphite cathode with an outer diameter of 24mm, an inner diameter of 10mm, and a height of 20mm into the graphene oxide electrophoretic solution obtained in step 5, and insert the cathode head into the solution to a depth of 20mm , carrying out electrophoresis treatment under the condition that the electric field strength is 50V / mm, the graphene oxide in the solution is adsorbed on the graphite cathode surface, the electrophoresis treatment time is 60min, and the cathode body whose surface layer is graph...

Embodiment 3

[0044] In this embodiment, the traditional graphite cathode is used as the basic cathode as an example: steps 1-4 are the same as in Example 1;

[0045] Step 5b. preparation of graphene oxide slurry: adding silver content to the graphene oxide powder obtained in step 4 is the conductive industrial silver paste of 75wt% high temperature resistant sintering, by graphene oxide powder: industrial silver paste=1: After the ratio of 3 is stirred and mixed evenly, the graphene oxide slurry is prepared for use;

[0046] Step 6. Prepare the explosive graphene electron cathode body: apply the graphene oxide slurry obtained in step 5b on the surface of the electron emission part of the graphite-based cathode, and cure at a temperature of 70° C. for 30 minutes;

[0047] Step 7. Prepare the explosive graphene electron cathode: place the graphene oxide cathode body obtained in step 6 in an inert gas atmosphere, and reduce and sinter at 900° C. for 2 hours to remove the functional groups in ...

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Abstract

The invention belongs to the explosive graphene electron cathode in microwave vacuum electronic devices and its production method; the electron cathode includes a metal or graphite base cathode and a graphene surface layer; the production method includes: preparation of graphene oxide, preparation of impurity and powder Graphene oxide suspension, graphene oxide suspension, graphene oxide powder, preparation of graphene oxide electrophoretic liquid or slurry, preparation of explosive graphene electron cathode embryo body, preparation of explosive graphene electron cathode. Since the invention uses graphene as the electronic cathode material, its atomic-level thickness and the reduction and sintering of graphene oxide will produce a large number of emission edges and emission points, which is conducive to the rapid and continuous formation of plasma, and covers the emission surface of the entire cathode . Therefore, it has the characteristics of fast pulse starting speed, short rising and falling time of emission, long pulse duration, good current waveform, no glitch, reliable production process, low cost, high efficiency, and easy to realize industrial production.

Description

technical field [0001] The invention belongs to the technical field of microwave vacuum electronic device production, in particular to an explosive graphene electron cathode in a field emission microwave vacuum device and a production method thereof. The electronic cathode produced by the method can also be used as a projection tube and other related electronic devices. The cathode of the device is used. Background technique [0002] Burst field emission cathodes can generate high-current electron beams. The high-current electron beams generated by these cathodes in high-voltage pulsed electric fields are called explosive electron emission, and can be applied to high-power microwave devices such as relativistic magnetrons, relativistic return wave tubes, etc. , high-power microwave devices play an important role in electronic countermeasures, material modification, food safety and other fields. Cathode performance is the key factor restricting the performance improvement of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J23/04H01J9/02
CPCH01J9/02H01J9/025H01J23/04
Inventor 柳建龙杨锦标曾葆青宋林川吴喆黎晓云傅文杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA