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A preparation method of carbon fiber cathode for electron beam emission

A technology of electron beam emission and carbon fiber, which is applied in cold cathode manufacturing, electrode system manufacturing, discharge tube/lamp manufacturing, etc., can solve the problems of complex preparation process, poor operability, and high cost, and achieve simple preparation process and heat resistance Good shock resistance and low production cost

Active Publication Date: 2019-06-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The cathode prefabricated body prepared by the above method has the following characteristics: (1) The cathode composed of carbon fiber bundles, current limiting resistors, high voltage electrodes and carbon fiber bundle mounting plates has complicated preparation process, gaps between carbon fiber bundles, current limiting resistors, etc. There is a deviation, each bundle of carbon fibers cannot completely guarantee the simultaneous emission of electron beams, and the uniformity and stability of the cathode-emitting electron beams prepared by this process are difficult to guarantee
(2) Adding carbon fiber to the metal as a reinforcing material can ensure the strength of the carbon fiber cathode, but the density and fluidity between the carbon fiber and the metal are quite different, and the carbon fiber is prone to agglomeration, and the preparation process is complicated and the cost is high.
(3) In the "brush" type carbon fiber cathode, there is no matrix support in the carbon fiber bundle, which is easy to loosen, and the carbon fiber is easy to bend. It is difficult to ensure that the surface of each bundle of carbon fiber is even, and the operability is poor.
The carbon fiber cathode prepared by the existing technology can not fully meet the actual demand

Method used

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  • A preparation method of carbon fiber cathode for electron beam emission
  • A preparation method of carbon fiber cathode for electron beam emission
  • A preparation method of carbon fiber cathode for electron beam emission

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Embodiment 1

[0032] A preparation process for a carbon fiber cathode for electron beam emission, comprising the following steps:

[0033] Step S10: degumming and dispersing of carbon fibers, including the following steps:

[0034] Step S11: Mix carbon fibers with absolute ethanol solution, the carbon fibers are long fibers of 20 cm and short fibers of 50 mm, the mass of long carbon fibers is 8 g, and the mass of short fibers is 25 g. The mass of absolute ethanol is 1200g, and an ultrasonic cleaning machine is used for ultrasonic degumming and dispersion, and the time of ultrasonic vibration is 1h, and the dispersed carbon fibers after degumming are obtained.

[0035] Step S12: Take out the dispersed carbon fibers after degumming, and place them in a drying oven for drying. The temperature during the drying process is 90° C., and the holding time is 1 hour to remove the remaining absolute ethanol.

[0036] Step S20: preparation of starch binder.

[0037] Mix 10 g of starch with 90 g of de...

Embodiment 2

[0046] A preparation process for a carbon fiber cathode for electron beam emission, comprising the following steps:

[0047] Step S10: degumming and dispersing of carbon fibers, including the following steps:

[0048] Step S11: Mix carbon fibers with absolute ethanol solution, the carbon fibers are long fibers of 20 cm and short fibers of 50 mm, the mass of long carbon fibers is 8 g, and the mass of short fibers is 32 g. The mass of absolute ethanol is 1600g, and the degumming and dispersion are carried out by ultrasonic cleaning machine, and the time of ultrasonic vibration is 1.5h, and the dispersed carbon fibers after degumming are obtained.

[0049] Step S12: Take out the dispersed carbon fibers after degumming, and place them in a drying oven for drying. The temperature of the drying process is 100° C., and the holding time is 0.5 h to remove the remaining absolute ethanol.

[0050] Step S20: preparation of starch binder.

[0051] Mix 10 g of starch with 90 g of deioniz...

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Abstract

The invention discloses a preparation method of a carbon fiber cathode used for electron beam emission, belonging to the field of cathode preparation. The preparation method of the carbon fiber cathode used for electron beam emission comprises the following steps: a small amount of starch binder is added to the carbon fibers, and degumming processing is required to be performed on the carbon fibers before use; the carbon fiber material is bonded into a whole through the starch binder to achieve a synergistic effect between the carbon fibers and the binder, so as to prepare a cathode prefabricating body; and then the cathode prefabricating body is carbonized to obtain the carbon fiber cathode. The cathode obtained by the invention has complete molding, smooth surface and good strength; thecarbon fibers have a uniform distribution and no agglomeration phenomenon, and the carbon fibers are well overlapped; after the cathode is damaged during use, it is not necessary to replace the cathode, and the cathode can be repeatedly used after the surface layer is polished; the starch is used as the binder, which is environmental and safe; and the whole preparation process is simple and the production cost is low.

Description

technical field [0001] The invention belongs to the field of cathode preparation and relates to a method for preparing a carbon fiber cathode for electron beam emission. Background technique [0002] Intensive pulsed electron beam treatment of the surface of materials has become an effective method for material surface modification. Intense pulsed electron beam treatment is carried out in a vacuum, and the high-energy incident electron beam instantly penetrates the surface of the material, causing rapid heating, cooling and solidification of the surface, thereby Improve the surface hardness, wear resistance and corrosion resistance of materials. The cathode is a key component for electron beam emission. The cathode material requires a flat and uniform surface, good strength and thermal shock resistance, and the more tips on the surface, the more uniform the electron beam emitted. As a discharge material, carbon fiber has the advantages of short start-up time, low emission t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/02
CPCH01J9/02
Inventor 郝胜智卢健
Owner DALIAN UNIV OF TECH