Lanthanum hexaboride hollow cathode based on welding structure of tungsten-rhenium heating wire and tungsten top

A technology of lanthanum hexaboride and welded structure, which is applied in the field of aerospace electric thruster control, can solve problems such as stable connection, difficulty in cathode top and heater heating wire, etc., to ensure connection strength, strong environmental adaptability, and compensation for thermal expansion The effect of the cold shrinkage effect

Active Publication Date: 2020-10-16
BEIJING INST OF CONTROL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the present invention is: in view of the problem in the current prior art that it is difficult to stably connect the cathode top and the heating element heating wire in the traditional lanthanum hexaboride hollow cathode structure, a heating element based on tungsten-rhenium is proposed. Lanthanum hexaboride hollow cathode with wire and tungsten top welding structure

Method used

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  • Lanthanum hexaboride hollow cathode based on welding structure of tungsten-rhenium heating wire and tungsten top
  • Lanthanum hexaboride hollow cathode based on welding structure of tungsten-rhenium heating wire and tungsten top
  • Lanthanum hexaboride hollow cathode based on welding structure of tungsten-rhenium heating wire and tungsten top

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Embodiment 1

[0032] A lanthanum hexaboride hollow cathode based on the welding structure of a tungsten rhenium heating wire and a tungsten top. The tungsten rhenium heating wire and the tungsten top adopt a tantalum ring transition welding structure. After starting to energize the leads at both ends of the heater, The thermal element continues to heat the lanthanum hexaboride emitter. At this time, the working gas enters the cathode tube at the gas inlet. The lanthanum hexaboride emitter is heated to a specified temperature and emits electrons in the same direction as the xenon gas along the cathode tube. The tantalum ring is melted and wrapped Heat the end face heating wire, the tungsten rhenium heating wire does not melt at this time, the molten tantalum ring wraps the tungsten rhenium heating wire 1 / 2 turn, and the other 1 / 2 turns of the tungsten rhenium heating wire adopts the spiral transition form as a stress relief bend. Wrapped by a molten tantalum ring, it is used to release the wel...

Embodiment 2

[0037] The tantalum ring is a hollow ring part with an eccentric hole. The material is tantalum metal. The tantalum ring is fitted on the outer cylindrical surface of the tungsten top. There is a clearance fit between the inner hole of the tantalum ring and the outer circle of the tungsten top. Recommended fit The gap is less than 0.05mm, and the tantalum ring and the tungsten top are welded into a whole through the end face welding structure by electron beam welding or laser welding;

[0038] The hot end lead of the thermal element is wound and inserted into the eccentric hole of the tantalum ring in the form of an involute spiral along the rotation direction of the thermal element. The matching gap between the tungsten rhenium heating wire and the eccentric hole of the tantalum ring is less than 0.05 mm. The method of focal electron beam or laser beam welding melts the tantalum around the eccentric hole of the tantalum ring, and the tungsten rhenium heating wire is not melted. T...

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Abstract

The invention provides a lanthanum hexaboride hollow cathode based on a welding structure of a tungsten-rhenium heating wire and a tungsten top. The lanthanum hexaboride hollow cathode comprises an ignition electrode, a thermal insulation layer, a thermal element, a lanthanum hexaboride emitter, a cathode tube, a tantalum ring and a cathode top, wherein a molten soldering structure with tantalum ring transition is adopted between the tungsten-rhenium heating wire and the cathode top, the tungsten-rhenium heating wire is covered by the molten tantalum ring, the molten tantalum ring wraps the tungsten-rhenium heating wire, the tungsten-rhenium heating wire can maintain the original plasticity of the tungsten-rhenium heating wire material without melting, effectively compensate the thermal expansion and contraction effect of the tungsten-rhenium heating wire, eliminate thermal stress, and has a strong environmental adaptability.

Description

Technical field [0001] The invention relates to a lanthanum hexaboride hollow cathode based on a welding structure of a tungsten rhenium heating wire and a tungsten top, and belongs to the technical field of aerospace electric thruster control. Background technique [0002] The lanthanum hexaboride hollow cathode used in aerospace electric thrusters has the advantages of high electron emission current density and low requirement on the purity of the working gas. In the common lanthanum hexaboride hollow cathode structure, the thermal lead generates Joule heating effect through the current. The lanthanum fluoride emitter is preheated, and when the lanthanum hexaboride reaches the working temperature, the cathode starts to work, the thermal element is cut off, and it bears the thermal load generated by the cathode work. [0003] The lanthanum hexaboride emitter must be heated to about 1650°C to efficiently emit electrons. The thermal element generally uses a refractory metal tungsten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03H1/00H01J1/02
CPCF03H1/0093H01J1/025Y02E30/10
Inventor 毛威扈延林胡大为吴朋安臧娟伟李胜军吴耀武山世华吴楠魏延明陈君杨健李栋姚兆普刘旭辉臧孝华胡鹏秦宇魏福智仝颖刚
Owner BEIJING INST OF CONTROL ENG
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