Impregnated Ba5Sr(WO6)2 cathode and preparation method thereof

A technology of barium tungstate and cathode, which is applied in the field of electric vacuum, can solve the problems such as difficult practicality of tungstate cathode, achieve the effects of improving cathode reliability, increasing emission current density, and reducing evaporation rate

Inactive Publication Date: 2016-07-20
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of an impregnated barium strontium tungstate cathode, to increase the emission current density of the barium strontium tungstate cathode, improve the reliability of the barium strontium tungstate cathode and prolong its life, thereby solving the problem of traditional tungstate Difficult practical problems of salt cathode

Method used

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  • Impregnated Ba5Sr(WO6)2 cathode and preparation method thereof
  • Impregnated Ba5Sr(WO6)2 cathode and preparation method thereof
  • Impregnated Ba5Sr(WO6)2 cathode and preparation method thereof

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Embodiment 1

[0029] The process flow chart of the preparation method of the present embodiment is as follows figure 1 shown.

[0030] Specifically, the method for preparing an impregnated barium strontium tungstate cathode in this embodiment includes the following steps:

[0031] (1) BaCO 3 , SrCO 3 and WO 6 After 72 hours of ball milling and mixing at a molar ratio of 5:1:2, at 20kg / cm 2 Under high pressure, the mixed powder material is pressed into a small cake with a diameter of 20mm and a thickness of 2-3mm.

[0032] (2) Put the pressed small cake into the crucible and put it into the muffle furnace with air atmosphere for sintering. First raise the temperature to 400±25°C and keep it for 30 minutes, then gradually raise the temperature to 800±50°C and keep it for 1 hour, and finally raise the temperature to 1400±50°C and keep it for 3 to 4 hours. The main phase of synthesis is barium strontium tungstate (Ba 5 Sr(WO 6 ) 2 ) tungstate, the obtained tungstate XRD analysis results...

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Abstract

The invention discloses an impregnated Ba5Sr(WO6)2 cathode and a preparation method thereof. The method comprises the following steps that (1) ball-mill mixing is carried out on BaCO3, SrCO3 and WO6 in the mol ratio of (4.8-5.2): (0.9-1.1): (1.8-2.2) for 65 to 75 hours, and then a mixture is pressed into a block; (2) the block is sintered for 3 to 4 hours at the temperature of 1400 + / -50 degree C to synthesize a tungstate; (3) the tungstate is mixed with an activating agent and then ground to obtain an active substance; (4) a cathode whose top end is welded with a tungsten sponge body is embedded into the active substance and dipped in a hydrogen furnace at high temperature; and (5) the obtained cathode is arranged in a numerical control lathe and turned to remove the residual tungstate so that a smooth end surface is exposed, and thus, the impregnated Ba5Sr(WO6)2 cathode is obtained. The preparation method can be used to improve the density of emission current of the Ba5Sr(WO6)2 cathode, improve the reliability of the Ba5Sr(WO6)2 cathode, prolong the service life of the Ba5Sr(WO6)2 cathode, and fundamentally solve the problem that a traditional tungstate cathode is hard to apply.

Description

technical field [0001] The invention belongs to the field of electric vacuum technology, in particular to an impregnated barium strontium tungstate cathode and a preparation method thereof. Background technique [0002] With the development of vacuum electronic devices in the direction of high power, high frequency, high reliability and long life, it is required to further increase the emission current density of the cathode, reduce the operating temperature of the cathode, reduce the evaporation rate of the cathode, and prolong the life of the cathode. At present, oxide cathodes and impregnated film-coated barium-tungsten cathodes are most widely used in vacuum electronic devices. The active material used for this type of cathode emission is an active Ba salt, such as aluminate, scandate, and tungstate. The activated cathode will continuously provide surplus Ba from the interior to diffuse to the surface of the cathode, so that the cathode can continuously emit electrons. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/04H01J1/142
CPCH01J9/047H01J1/142
Inventor 胡明炜王小霞罗积润漆世锴李云张琪
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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