A kind of scandium-containing cathode on the top layer of submicron structure and preparation method thereof

A submicron and cathode technology, which is applied in the manufacture of cold cathodes, thermionic cathodes, and electrode systems, can solve the problems of uneven diffusion and distribution of scandium and its oxides, shorten the preparation time, etc., and achieve high emission performance, emission good uniformity
CN109390195BActive Publication Date: 2020-11-27BEIJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING UNIV OF TECH
Publication Date
2020-11-27

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Abstract

A submicron-structured top-layer scandium-containing cathode and a preparation method thereof belong to the technical field of rare earth refractory metal hot cathode materials. The method comprises preparing submicron-order scandium-oxide-doped refractory metal powder by using a sol-gel hydrogen reduction method; obtaining a submicron-structured top-layer scandium-containing refractory metallic substrate by compressed microwave sintering; subjecting the refractory metal powder to compressed sintering to obtain a refractory metal cathode substrate; impregnating the cathode substrate with a cathode emitting active salt and annealing the cathode substrate to obtain a substrate refractory metal cathode; and finally preparing a submicron-structured top-layer scandium-containing cathode by means of welding such as laser welding, brazing or the like. The submicron-structured top-layer scandium-containing cathode prepared by the invention has large emission current density and good emission uniformity, and has the maximum emission current density as high as 100 A / cm2 and an emission slope over 1.41 at a working temperature of 950 degrees centigrade after fully activated.
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Description

technical field

[0001] The invention belongs to the technical field of rare earth refractory metal hot cathode materials, relates to the field of electric vacuum components, and more specifically relates to a scandium-containing cathode in the top layer of a submicron structure and a preparation method thereof. Background technique

[0002] As a vacuum electron emission source, hot cathode electron emitter occupies an irreplaceable important position in the field of electric vacuum components. It is widely used in military, medical and other fields, and is used in microwave tubes in advanced electronic weapons and high-resolution vacuum displays. The device requires the cathode to have high emission current density and low operating temperature, and also requires the cathode to be able to withstand harsh environments and ion bombardment and have a life span of tens of thousands of hours. In addition, the stability and reliability of the cathode process is also very important...

Claims

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