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

Direct heating cathode for high power magnetron and preparation method thereof

A magnetron, direct heating technology, applied in the field of electric vacuum, can solve the problem of too fast evaporation on the surface of the cathode, achieve the effect of strong ion bombardment, increase the emission current density, and reduce the evaporation rate

Inactive Publication Date: 2019-08-09
JIUJIANG UNIVERSITY
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under normal output power conditions, the cathode of a high-power continuous wave magnetron generally works at a temperature above 2450K. Excessively high operating temperature of the cathode will cause the surface of the cathode to evaporate too quickly. When the diameter of the cathode is lower than the initial diameter 90%, the cathode life of the magnetron is declared over

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
  • Direct heating cathode for high power magnetron and preparation method thereof
  • Direct heating cathode for high power magnetron and preparation method thereof
  • Direct heating cathode for high power magnetron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method for preparing a direct-heated cathode for a high-power magnetron according to an embodiment of the present invention comprises the following steps:

[0031] a. Metal W powder with a purity of 99.9% and an average particle size of 1 μm and ThO 2 The powder was mixed in an agate bowl in a ratio of 97:3 by weight and ground for 24 hours to obtain uniformly mixed tungsten-thorium alloy powder;

[0032] b. Stir and mix the uniformly mixed tungsten-thorium alloy powder and 1.5wt% nitrocellulose solution in a ratio of 1:2 by weight for 0.5 hours to obtain a uniform mixed solution, and use a spray gun to spray the mixed solution on the surface of the W wire cathode substrate, Then, bake the surface of W silk for 1 hour, and the nitrocellulose solution evaporates completely;

[0033] c. Put the W wire coated with tungsten-thorium alloy powder on the surface into a high-temperature hydrogen furnace for sintering. It takes 1 hour to rise linearly from room temperature ...

Embodiment 2

[0037] The method for preparing a direct-heated cathode for a high-power magnetron according to an embodiment of the present invention comprises the following steps:

[0038] a. Metal W powder with a purity of 99.9% and an average particle size of 3 μm and ThO 2 The powder was mixed in an agate bowl in a ratio of 99:1 by weight and ground for 48 hours to obtain uniformly mixed tungsten-thorium alloy powder;

[0039] b. Stir and mix the uniformly mixed tungsten-thorium alloy powder and 3wt% nitrocellulose solution in a ratio of 1:4 by weight for 2 hours to obtain a uniform mixed solution. Use a spray gun to spray the mixed solution on the surface of the W wire cathode substrate, and then , bake the surface of W wire for 1.5h, and the nitrocellulose solution evaporates completely;

[0040] c. Put the W wire coated with tungsten-thorium alloy powder on the surface into a high-temperature hydrogen furnace for sintering. It takes 2 hours to rise linearly from room temperature to 2...

Embodiment 3

[0044] The method for preparing a direct-heated cathode for a high-power magnetron according to an embodiment of the present invention comprises the following steps:

[0045] a. Metal W powder with a purity of 99.9% and an average particle size of 2 μm and ThO 2 The powder was mixed in an agate bowl in a ratio of 98:2 by weight and ground for 36 hours to obtain uniformly mixed tungsten-thorium alloy powder;

[0046] b. Stir and mix the uniformly mixed tungsten-thorium alloy powder and 2wt% nitrocellulose solution in a ratio of 1:3 by weight for 1 hour to obtain a uniform mixed solution. Use a spray gun to spray the mixed solution on the surface of the W wire cathode substrate, and then , bake the surface of W wire for 1.5h, and the nitrocellulose solution evaporates completely;

[0047] c. Put the W wire coated with tungsten-thorium alloy powder on the surface into a high-temperature hydrogen furnace for sintering. It takes 1.5 hours to rise linearly from room temperature to ...

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
particle sizeaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a direct heating cathode for a high power magnetron and a preparation method thereof. The preparation method comprises the following steps: metal tungsten powder and thorium oxide powder are mixed and ground to obtain tungsten-thorium alloy powder, the tungsten-thorium alloy powder is mixed with a 1.5-3wt% nitrocellulose solution to obtain a mixed solution, the mixed solution is sprayed on the surface of a tungsten wire cathode substrate to be baked under an infrared lamp and a tungsten wire cathode with the tungsten-thorium alloy powder on the surface is obtained, thenthe tungsten wire cathode is put in a high temperature hydrogen furnace to be sintered and high temperature decontamination and carbonization are performed so that the direct heating cathode for thehigh power magnetron is prepared. According to the direct heating cathode for the high power magnetron, the emission current density of the pure tungsten wire cathode for the magnetron can be improved, the working temperature and the surface evaporation rate of the pure tungsten wire cathode can be reduced and thus the service life of the cathode and the magnetron can be prolonged.

Description

technical field [0001] The invention relates to the field of electric vacuum technology, in particular to a direct heating cathode for a high-power magnetron and a preparation method thereof. Background technique [0002] At present, magnetrons are developing in the direction of high output power. Ordinary barium tungsten cathodes, oxide cathodes, etc. are not resistant to electron and ion bombardment, are not resistant to anode high voltage, and are prone to sparking, so they can hardly operate at high power. Applications in continuous wave magnetrons. Therefore, in the high-power continuous wave magnetron with high anode voltage, the directly heated pure tungsten (W) wire cathode with weak emission ability is widely used. Compared with ordinary oxide cathodes and barium tungsten cathodes, pure W wire cathodes have the advantages of high emission stability, strong resistance to electron and ion bombardment, and strong resistance to poisoning. However, under normal output ...

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): H01J23/04H01J9/04
CPCH01J9/042H01J23/04
Inventor 漆世锴高阳徐梦婷刘理查兵谢辉程曾伟
Owner JIUJIANG UNIVERSITY
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