A kind of preparation method of low temperature high current density scandium oxide cathode

A scandium oxide, high current technology, applied in the field of electric vacuum, can solve the problems of low current density and poor uniformity of the emission coating, and achieve the effects of enhancing electrical conductivity, reducing cathode evaporation, and improving current density

Active Publication Date: 2021-12-03
NO 12 RES INST OF CETC
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Problems solved by technology

However, the uniformity of the emissive coating formed by doping scandium in this emissive material is poor, resulting in low emission current density at low temperature

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  • A kind of preparation method of low temperature high current density scandium oxide cathode
  • A kind of preparation method of low temperature high current density scandium oxide cathode
  • A kind of preparation method of low temperature high current density scandium oxide cathode

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preparation example Construction

[0042] In a basic embodiment of the present invention, a method for preparing a scandium-containing oxide cathode with low temperature and high current density is disclosed. figure 1 It shows one of the flow charts for preparing a scandium-containing oxide cathode with low temperature and high current density according to the embodiment of the present invention. like figure 1 As shown, this embodiment includes:

[0043] Step S101, preparing scandium-containing oxide spraying material, the scandium-containing oxide spraying material is scandium-containing carbonate;

[0044] Step S102, using a plasma spraying method to spray the scandium-containing oxide spraying material onto the cathode substrate to form a low-temperature high-current-density scandium-containing oxide cathode.

[0045] Compared with the oxide cathode prepared by the ordinary coating method, the oxide coating prepared by the plasma spraying technology in the present invention is dense, which can enhance the ...

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Abstract

The invention discloses a method for preparing a scandium-containing oxide cathode at low temperature and high current density. The scandium-containing oxide spraying material is sprayed onto the cathode substrate to form a scandium-containing oxide cathode with low temperature and high current density. The present invention uses scandium-containing carbonate emission materials to improve the uniformity of scandium content of the oxide cathode coating, so that the oxide cathode has a large current density at low temperature, enhances the firmness of the cathode coating, and reduces the exhaust time. Moreover, the oxide coating prepared by plasma spraying technology is dense, which can enhance the conductivity of the cathode, further increase the pulse emission current density, reduce cathode evaporation, and prolong the life of the cathode.

Description

technical field [0001] The invention relates to the field of electric vacuum technology. More specifically, it relates to a method for preparing a scandium-containing oxide cathode with low temperature and high current density. Background technique [0002] Oxide cathode is one of the most widely used hot cathodes in electric vacuum devices. At present, the oxide cathode is mainly made by adding the nitric acid aqueous solution of barium strontium calcium to sodium carbonate or ammonium carbonate to generate the ternary carbonate of barium strontium calcium carbonate, and then mixing the carbonate with organic solvent and binder. Slurry suspension, the suspension is coated on the base metal of the cathode at room temperature to form a ternary carbonate coating. This traditional coating method prepares an oxide cathode, and the coating and the substrate are not firmly bonded, which is easy to cause the coating to peel off, thereby shortening the life of the cathode. The pla...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/04
Inventor 张敏邵文生张珂于志强高玉娟
Owner NO 12 RES INST OF CETC
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