Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A hot cathode having a three-dimensional structure surface and a preparation method thereof

A three-dimensional structure, hot cathode technology, applied in the manufacture of thermionic cathodes, solid thermionic cathodes of discharge tubes, main electrodes of discharge tubes, etc., can solve the problem of small improvement in cathode performance, achieve strong ion bombardment resistance, and stable emission , high consistency effect

Pending Publication Date: 2018-12-21
NO 12 RES INST OF CETC
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main ways to increase the cathode emission current density are to improve the mixing ratio of calcium oxide, calcium oxide and alumina in the aluminate, to improve the consistency of the particle size of the tungsten powder and the porosity of the tungsten sponge. Through these methods, the performance of the cathode has been improved. It has been improved to a certain extent, but the improvement of cathode performance is relatively small

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A hot cathode having a three-dimensional structure surface and a preparation method thereof
  • A hot cathode having a three-dimensional structure surface and a preparation method thereof
  • A hot cathode having a three-dimensional structure surface and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] In the prior art, the scandate cathode has relatively poor stability in emitting electron beams and weak resistance to ion bombardment, and the electron emission capability of the cathode is seriously damaged and difficult to recover after being ignited. In high-performance microwave devices, barium tungsten cathodes or film-coated barium tungsten cathodes are generally still used. Usually, the emission current intensity of the barium tungsten cathode or film-coated barium tungsten cathode is increased by increasing the cathode emission current density, but there are several existing methods for increasing the cathode emission current density, which improve the performance of the cathode relatively little. In view of the above problems, the present invention provides a hot cathode capable of effectively increasing the emission current intensity of the cathode and a preparation method thereof, and the specific technical solutions are as follows.

[0035] In one aspect, t...

Embodiment 1

[0051] This embodiment provides a hot cathode with a three-dimensional structure surface and a preparation method thereof. The hot cathode with a three-dimensional structure surface is composed of a porous tungsten base impregnated with aluminate and a precious metal film formed on the surface of the porous tungsten base. The emission surface of the porous tungsten base is grooved to form a regularly arranged concave structure. The porosity of the porous tungsten matrix is ​​25%, and the aluminates BaO, CaO and Al 2 o 3 The mixing ratios are 66%, 11%, 23%. The concave structure on the surface of the porous tungsten substrate is a number of periodically arranged V-shaped channels, the channels are arranged in one direction, the width of the upper part of the channel is 5 μm, the channel depth is 5 μm, and the channel spacing is 5 μm; the precious metal is osmium , thickness 0.5 μm.

[0052] The preparation method of the hot cathode is as follows:

[0053] In the first step,...

Embodiment 2

[0060] This embodiment provides a hot cathode with a three-dimensional structure surface and its preparation method. The hot cathode is composed of a porous tungsten base impregnated with aluminate and a precious metal film formed on the surface of the porous tungsten base, wherein the porous tungsten The emitting surface of the base is grooved to form a regularly arranged concave structure.

[0061] Porous tungsten base with 25% porosity, aluminates BaO, CaO and Al 2 o 3 The mixing weight percentages are 66%, 11%, 23%. The channel structure on the porous tungsten-based surface is a number of V-shaped channels arranged periodically and regularly. The channels are periodic structures in the orthogonal direction. The width of the upper part of the channel is 35 μm, the channel depth is 100 μm, and the channel spacing is 50 μm; Osmium, thickness 2μm.

[0062] A hot cathode with a three-dimensional structured surface is prepared as follows:

[0063] In the first step, aluminat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
widthaaaaaaaaaa
depthaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a hot cathode with a three-dimensional structure surface and a preparation method thereof, belonging to the technical field of vacuum components. The hot cathode comprises a porous tungsten base impregnated with an aluminate and a precious metal film formed on the surface of the porous tungsten base, and the emission surface of the porous tungsten base is grooved to form aregularly arranged concave structure. The invention also discloses a preparation method of the hot cathode. The hot cathode provided by the invention can increase the effective area of the cathode electron emission surface, thereby remarkably improving the current emission intensity of the cathode, and being an ideal electron source of a vacuum microwave device.

Description

technical field [0001] The invention relates to the technical field of vacuum components. More specifically, it relates to a hot cathode with a three-dimensional structured surface and a preparation method thereof. Background technique [0002] Hot cathode is the core component of vacuum microwave devices. As the electron source of vacuum devices, its emission characteristics directly determine the performance of vacuum devices. With the development of high-frequency microwave technology, high-frequency and high-power vacuum microwave devices have put forward higher requirements for the electron emission performance of hot cathodes. The higher the operating frequency of microwave devices, the smaller the volume of the device, and accordingly the size of the cathode is gradually reduced, and the required emission current density of the cathode is also greater, so the high current density cathode is the best choice for preparing high-frequency vacuum microwave devices premis...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/13H01J9/04
CPCH01J1/13H01J9/04H01J2201/19
Inventor 郝广辉邵文生张珂李泽鹏
Owner NO 12 RES INST OF CETC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com