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Graphite composite cathode and preparation method thereof

A composite cathode and graphite technology, which is applied in the field of graphite composite cathode and its preparation, can solve problems such as limitations, and achieve the effects of long service life, good uniformity, and simple and convenient preparation methods

Active Publication Date: 2018-11-20
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon carbide whiskers (or nanowires) are difficult to make cathodes with large size and certain strength, so the application of strong current explosive emission cathodes is greatly limited

Method used

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  • Graphite composite cathode and preparation method thereof
  • Graphite composite cathode and preparation method thereof
  • Graphite composite cathode and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] A graphite composite cathode of the present invention is specifically a large aspect ratio carbon fiber doped graphite composite cathode, and the graphite composite cathode is prepared from graphite powder, carbon fiber and medium-temperature pitch.

[0041] In this embodiment, based on the mass fraction, the content of graphite powder is 70%, the content of carbon fiber is 5%, and the content of medium-temperature pitch is 25%.

[0042] In this embodiment, the graphite powder used in the graphite composite cathode is 200 mesh flake graphite powder.

[0043] In this embodiment, the carbon fiber used in the graphite composite cathode is chopped carbon fiber, which passes through a 400-mesh sieve, has a diameter of about 7 μm, and a length of 20 to 200 μm. The microscopic appearance of the chopped carbon fiber is as follows: figure 2 shown.

[0044] A method for preparing the graphite composite cathode of the above-mentioned present embodiment, comprising the following st...

Embodiment 2

[0054] A graphite composite cathode of the present invention is specifically a large aspect ratio carbon fiber doped graphite composite cathode, and the graphite composite cathode is prepared from graphite powder, carbon fiber and medium-temperature pitch.

[0055] In this embodiment, based on the mass fraction, the content of graphite powder is 72.5%, the content of carbon fiber is 2.5%, and the content of medium-temperature pitch is 25%.

[0056] In this embodiment, the graphite powder used in the carbon fiber-doped graphite composite cathode is 200 mesh flake graphite powder.

[0057] In this embodiment, the carbon fibers used in the carbon fiber-doped graphite composite cathode are chopped carbon fibers, which pass through a 400-mesh sieve, have a diameter of 7 μm, and a length of about 20-200 μm.

[0058] A method for preparing the graphite composite cathode of the above-mentioned present embodiment, comprising the following steps:

[0059] (1) Ingredients of cathode mat...

Embodiment 3

[0066] A graphite composite cathode of the present invention is specifically a large aspect ratio carbon fiber doped graphite composite cathode, and the graphite composite cathode is prepared from graphite powder, carbon fiber and medium-temperature pitch.

[0067] In this embodiment, based on the mass fraction, the content of graphite powder is 65%, the content of carbon fiber is 10%, and the content of medium-temperature pitch is 25%.

[0068] In this embodiment, the graphite powder used in the carbon fiber-doped graphite composite cathode is 400 mesh flake graphite powder.

[0069] In this embodiment, the carbon fibers used in the carbon fiber-doped graphite composite cathode are chopped carbon fibers, which pass through a 400-mesh sieve, have a diameter of 7 μm, and a length of about 20-200 μm.

[0070] A method for preparing the graphite composite cathode of the above-mentioned present embodiment, comprising the following steps:

[0071] (1) Ingredients of cathode materi...

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Abstract

The invention discloses a graphite composite cathode and a manufacturing method thereof. The graphite composite cathode is manufactured by taking graphite powder and / or carbon black powder as a matrix material, taking carbon fibers and / or SiC crystal whiskers as a doping material, and taking mid-temperature pitch as an adhesive. The manufacturing method comprises: (1) matching of a cathode material; (2) preparation of a mixed powdery material; (3) mixing and kneading of the mixed powdery material; (4) forming of the mixed powdery material; (5) impregnating and roasting of a blank; and (6) processing of the cathode. The graphite composite cathode is large in field enhancement factor and good in electron emission performance. The manufacturing method is simple and convenient, and is low in cost.

Description

technical field [0001] The invention relates to a graphite composite cathode and a preparation method thereof, in particular to a large aspect ratio fiber or whisker-doped graphite composite cathode and a preparation method thereof, which can be applied to the fields of high-current pulsed electron beam technology, high-power microwave, etc. . Background technique [0002] The high-power microwave source (HPM source) performs beam energy exchange in a certain electromagnetic structure through the high-power electron beam emitted by the cathode of the vacuum diode, and converts the energy of the electron beam into the energy of electromagnetic waves, thereby generating high-power microwaves. Therefore the cathode is a crucial component in a high power microwave system. [0003] In recent years, the research on cathode materials for HPM sources has mainly focused on metals, velvet and graphite. The metal cathode has low requirements for vacuum, and a large amount of plasma i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/83C04B35/81C04B35/532
CPCC04B35/532C04B35/80C04B35/83C04B2235/425C04B2235/48C04B2235/5248C04B2235/5276
Inventor 陈兴宇万红华叶白书欣张为军刘卓峰
Owner NAT UNIV OF DEFENSE TECH
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