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High-current repetition frequency strontium titanate-carbon nanotube dielectric cathode and preparation method thereof

A carbon nanotube and repetition frequency technology, which is used in cold cathode manufacturing, electrode system manufacturing, discharge tube/lamp manufacturing, etc. The problem of large enhancement coefficient, etc., achieves the effects of good emission uniformity and stability, improved flashover emission probability, and improved high-current emission life.

Active Publication Date: 2020-04-10
INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electric field enhancement coefficient is too large, and the stress release under the electric field affects the deformation recovery of carbon nanotubes.
Due to the interface binding force of the conventional carbon nanotube thin film cathode at this stage, the emission stability of the high-current repetition rate is not good, and the number of emission is extremely limited.

Method used

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  • High-current repetition frequency strontium titanate-carbon nanotube dielectric cathode and preparation method thereof
  • High-current repetition frequency strontium titanate-carbon nanotube dielectric cathode and preparation method thereof
  • High-current repetition frequency strontium titanate-carbon nanotube dielectric cathode and preparation method thereof

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Embodiment 1

[0049] A high-current repetition frequency strontium titanate-carbon nanotube dielectric cathode in this embodiment includes a tubular cathode body made of SrTiO3 ceramics, the side of the cathode body is a rough surface, and the side of the cathode body is attached with an emission layer made of carbon nanotubes. The thickness of the emission layer is 0.1mm, and SiO2-B2O-ZnO glass powder is added, and the cathode body and the emission layer are co-sintered to form.

[0050] A method for preparing a high-current repetition frequency strontium titanate-carbon nanotube dielectric cathode in this embodiment includes the following steps:

[0051] Step a: use concentrated nitric acid to carry out carboxylation enhanced activity treatment to carbon nanotubes, and add 0.1% and cellulose; Mix carbon nanotubes and 5% terpineol, grind and make the first slurry; SiO2-B2O - ZnO glass powder and 5% terpineol are mixed and ground to obtain the second slurry; the first slurry and the second sl...

Embodiment 2

[0057] A high-current repetition frequency strontium titanate-carbon nanotube dielectric cathode in this embodiment includes a tubular cathode body made of SrTiO3 ceramics, the side of the cathode body is a rough surface, and the side of the cathode body is attached with an emission layer made of carbon nanotubes. The thickness of the emission layer is 1mm, and SiO2-B2O-ZnO glass powder is added, and the cathode body and the emission layer are co-sintered to form.

[0058] A method for preparing a high-current repetition frequency strontium titanate-carbon nanotube dielectric cathode in this embodiment includes the following steps:

[0059] Step a: use concentrated nitric acid to carry out carboxylation enhanced activity treatment to carbon nanotubes, and add 0.1% and cellulose; Mix carbon nanotubes and 1% terpineol, grind and make the first slurry; SiO2-B2O -ZnO glass powder and 1% terpineol were mixed and ground to obtain the second slurry; the first slurry and the second sl...

Embodiment 3

[0065] A high-current repetition frequency strontium titanate-carbon nanotube dielectric cathode in this embodiment includes a tubular cathode body made of SrTiO3 ceramics, the side of the cathode body is a rough surface, and the side of the cathode body is attached with an emission layer made of carbon nanotubes. The thickness of the emission layer is 0.5mm, and SiO2-B2O-ZnO glass powder is added, and the cathode body and the emission layer are co-sintered to form.

[0066] A method for preparing a high-current repetition frequency strontium titanate-carbon nanotube dielectric cathode in this embodiment includes the following steps:

[0067] Step a: use concentrated nitric acid to carry out carboxylation enhanced activity treatment to carbon nanotubes, and add 0.5% and cellulose; Mix carbon nanotubes and 3% terpineol, grind and make the first slurry; SiO2-B2O -ZnO glass powder and 3% terpineol were mixed and ground to obtain the second slurry; the first slurry and the second ...

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Abstract

The invention discloses a high-current repetition frequency strontium titanate-carbon nanotube dielectric cathode. The cathode comprises a cathode body made of SrTiO3 ceramic, an emission layer made of carbon nanotubes is attached to the side surface of the cathode body, and the cathode body and the emission layer are co-sintered and molded. By adopting the high-current repetition frequency strontium titanate-carbon nanotube dielectric cathode and the preparation method thereof, the cathode emission threshold value is low and uniform, and the emission life is prolonged.

Description

technical field [0001] The invention relates to a high-current repetition frequency strontium titanate-carbon nanotube dielectric cathode and a preparation method thereof, belonging to the technical field of relativistic electric vacuum devices. Background technique [0002] Relativistic electric vacuum devices are developing towards high power, high repetition rate, miniaturization and long life. The electron beam is the energy source of beam and wave interaction, and it needs to meet the requirements of uniform emission, stability, and electron beam density at least greater than 1kA / cm2 at a certain repetition frequency, which requires the cathode to directly emit electrons under the drive of a high-voltage pulse power supply and the emission threshold High flow cold cathode with low and stable performance. The commonly used high-current cathode is the field explosion emission cathode. The whiskers on the surface of the cathode are field-emitted under the action of the el...

Claims

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Application Information

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IPC IPC(8): H01J1/304H01J9/02
CPCH01J1/304H01J9/025
Inventor 向飞余志勇闫二艳谭杰罗敏金晖康强王淦平王朋
Owner INST OF APPLIED ELECTRONICS CHINA ACAD OF ENG PHYSICS
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