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Composite cathode structure capable of emitting heavy current

A composite cathode, high current technology, applied in the direction of the solid thermionic cathode of the discharge tube, the main electrode of the discharge tube, the parts of the discharge tube/lamp, etc. problems such as high power consumption, to achieve the effect of contributing to current emission, improving energy utilization, and improving emission performance

Inactive Publication Date: 2015-01-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hot cathode material has stable performance and high emission current density, but its electron emission requires high-temperature heating, which leads to high power consumption, high temperature, and inability to respond immediately to the hot cathode, making it difficult to achieve miniaturization and integration. The hot cathode is widely used today The material is a scandium-based hot cathode material, mainly adding a small amount of scandium-containing substances to barium aluminate; while a cold cathode generally refers to a field emission cathode, which has a quantum tunneling effect under the action of a strong electric field, allowing electrons to escape from the solid surface , this kind of cathode is still in the primary stage of application, and now the field emission materials used are mainly carbon nanotubes, diamond films, graphene and nanoscale oxides, etc.

Method used

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  • Composite cathode structure capable of emitting heavy current
  • Composite cathode structure capable of emitting heavy current
  • Composite cathode structure capable of emitting heavy current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) if figure 1 , laying the hot cathode material 2 at the center of the cathode substrate 1 to form a circular laying area, the hot cathode material 2 adopts aluminate in this embodiment;

[0021] 2) The field emission material 3 is laid outside the circular laying area in the center of the cathode substrate 1 to form a circular laying area. The width of the circular laying area is greater than the diameter of the circular laying area. In this embodiment The field emission material 3 adopts carbon nanotubes;

[0022] 3) Heat the metal substrate covered with cathode material to 1200° C. in a hydrogen atmosphere, keep the temperature constant for 2 hours, and then cool to prepare the cathode.

Embodiment 2

[0024] 1) if figure 2 , the field emission material 3 is laid at the center of the cathode substrate 1 and the second ring from the inside to the outside to form a circular laying area and a circular laying area. The field emission material 3 of this embodiment adopts carbon nanotube;

[0025] 2) Lay the hot cathode material 2 at the first ring outside the circular laying area to form a circular laying area. In this embodiment, the hot cathode material 2 is made of aluminate, and the field emission material 3 is laid The width of the laying area is greater than the width of the laying area where the hot cathode material 2 is laid;

[0026] 3) Heat the above-mentioned metal substrate covered with the cathode material to 1200° C. in a hydrogen atmosphere, keep the temperature constant for 2 hours, and then cool to prepare the cathode.

Embodiment 3

[0028] 1) if image 3 , laying the hot cathode material 2 at the center of the cathode substrate 1 and the second ring from the inside to the outside to form a circular laying area and a ring laying area. In this embodiment, the hot cathode material 2 adopts aluminate;

[0029] 2) Lay the field emission material 3 at the first and third rings outside the circular laying area to form two circular laying areas, in which the width of the laying area where the field emission material 3 is laid is larger than the laying heat The width of the laying area of ​​the cathode material 2, the field emission material 3 of the present embodiment adopts carbon nanotubes;

[0030] 3) Heat the metal substrate covered with cathode material to 1200° C. in a hydrogen atmosphere, keep the temperature constant for 2 hours, and then cool to prepare the cathode.

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Abstract

The invention discloses a composite cathode structure capable of emitting a heavy current. The composite cathode structure is characterized in that a hot cathode material and a field emission material adopt an order overlapping distributed manner to prepare on the surface of a cathode base, the complementary property of the material is fully utilized, namely a local high temperature heating hot cathode material generated by emission of the field emission material in a composite structure is utilized to promote the emission material to generate thermionic emission; emission current drop caused by field emission cathode damage at a high temperature brings can be compensated to some extent, and the current density of electronic emission is observably improved; and the reliability of a cathode is guaranteed, and the composite cathode structure has high utilization potentiality in a high-power electronic device.

Description

technical field [0001] The invention belongs to the field of vacuum electronic devices and relates to a composite structure of hot cathode materials and field emission materials. Background technique [0002] High current density cathode electron emission source is one of the key technologies of high-power electronic devices (such as high-power microwave amplifiers, cyclotrons, etc.). The cathode materials of electronic devices are mainly divided into field emission materials (cold cathode materials) and thermal emission cathode materials. The electron emission mechanism of thermal emission cathode materials is: when the cathode material is heated to a certain temperature, the internal electron energy is large enough to overcome When the surface barrier acts, thermionic emission occurs. The hot cathode material has stable performance and high emission current density, but its electron emission requires high-temperature heating, which leads to high power consumption, high te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J1/304H01J1/13
Inventor 陈心全王琦龙崔云康李驰狄云松
Owner SOUTHEAST UNIV