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A kind of high secondary electron emission coefficient cold cathode material and its preparation method

A technology of secondary electron emission and electron emission materials, which is applied in the field of secondary electron cold cathode materials and its preparation, can solve the problems of unsatisfactory, long-term use, and limited application occasions, and achieve stable performance and long service life Long-lasting, highly chemically stable effect

Active Publication Date: 2017-01-25
GRIKIN ADVANCED MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic Beijing Nonferrous Metal Research Institute has further developed Cu-based cold cathodes and PdBa cold cathodes since the 1990s. The Cu-based cold cathode electron emission materials described in patent CN1062608C have been applied, but their applications are limited and their lifespan cannot To meet the current long-term use requirements, the PdBa alloy cold cathode described in the patent CN101191164A has a long service life and stable performance, and its δ is about 2.5
With the development of radar technology, the requirements for the secondary electron emission coefficient of cold cathode materials are further improved (δ>3), and traditional pure metal, PdBa, Cu-based cold cathode materials cannot meet the requirements of modern high-performance electronic devices.

Method used

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  • A kind of high secondary electron emission coefficient cold cathode material and its preparation method
  • A kind of high secondary electron emission coefficient cold cathode material and its preparation method
  • A kind of high secondary electron emission coefficient cold cathode material and its preparation method

Examples

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Embodiment 1

[0028] The preparation method of cold cathode material of the present invention is as follows:

[0029] (1) Pt with a purity of 99.95% and Ba with a purity of 99.9% are mixed according to 1.5% by weight of Ba and the rest is Pt, and are smelted in a vacuum induction melting furnace at a melting temperature of 1750-1900°C.

[0030] (2) After melting, the alloy is poured directly into the metal mold, and the pouring temperature is about 1750-1800°C;

[0031] (3) hot-rolling the cast ingot, the hot-rolling temperature is 900° C., the pass deformation is 10%, and when the total deformation reaches 60%, it is annealed at 800° C. for 60 minutes;

[0032] (4) Carry out cold rolling and annealing subsequently, cold rolling deformation amount 50%, carry out vacuum annealing, vacuum degree 10 -1 Pa, the annealing time is 1h, the annealing temperature is 700°C, and finally a cold cathode strip with a thickness of 0.1mm is obtained.

[0033] The metallographic structure of the cold cath...

Embodiment 2

[0038] This example describes a possible composition of the cold cathode material of the present invention and its preparation method, and characterizes its microstructure and properties.

[0039] The preparation method of the cold cathode material described in this embodiment is as follows:

[0040] (1) Pt with a purity of 99.95% and Ba with a purity of 99.9% are mixed according to the Ba content of 3wt.% and the rest is Pt, and placed in a vacuum induction melting furnace for melting at a melting temperature of 1750-1900°C.

[0041] (2) After melting, the alloy is poured directly into the metal mold, and the pouring temperature is about 1750-1800°C;

[0042] (3) hot-rolling the cast ingot, the hot-rolling temperature is 1100° C., and the pass deformation is 7%. When the total deformation reaches 60%, it is annealed at 900° C. for 50 minutes;

[0043] (4) Carry out cold rolling and annealing subsequently, cold rolling deformation amount 30%, carry out vacuum annealing, vacuu...

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Abstract

The invention belongs to the technical field of negative electrode-material preparation and relates to a cold negative electrode material with high secondary-electron emission coefficient and a preparation method thereof. The cold negative electrode material comprises the following components in percentage by weight: 1.5%-4.5% of barium and 95.5%-98.5% of platinum; and the microstructure of the material is as follows: the platinum is used as a basal body and Pt5Ba is a second phase which is distributed in the basal body. The cold negative electrode material is continuously bombarded for 3600 hours under the condition that the power of primary electron bombardment is 200W / cm<2>, and the secondary-electron emission coefficient delta is more than 3.0. The cold negative electrode material is prepared by a series of processes such as casting, hot rolling, cold rolling and heat treatment. The cold negative electrode material has the advantages of high secondary-electron emission coefficient, long service life, stable performance and the like.

Description

technical field [0001] The invention belongs to the technical field of cold cathode material preparation, and in particular relates to a secondary electron cold cathode material with high secondary electron emission coefficient, long service life, stable and reliable performance and a preparation method thereof. Background technique [0002] When electrons or ions with a certain energy bombard the surface of an object, it will cause electrons or ions to be emitted from the surface of the bombarded object. This phenomenon is called secondary electron emission. With the development of electronic technology, secondary electron emission has been more and more widely used. Vacuum electronic devices based on secondary electron emission are widely used in broadcasting, communication, radar, aerospace and other fields of high-frequency and high-power electromagnetic waves. . The performance of vacuum electronic devices depends largely on the performance of the cathode. Since the ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C5/04C22C1/02C22F1/14H01J1/32H01J1/30H01J9/02
Inventor 刘书芹王越王兴权王欣平何金江尚再艳高岩张巧霞
Owner GRIKIN ADVANCED MATERIALS
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