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Manufacture method of annular barium-tungsten cathode emitter

A barium-tungsten cathode and a manufacturing method are applied in the manufacturing field of annular barium-tungsten cathode emitters, which can solve problems such as copper residues, and achieve the effects of low production cost, obvious application prospects, and deformation avoidance.

Active Publication Date: 2010-06-09
甘肃虹光电子有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of copper residue in the traditional copper immersion method, the present invention provides a manufacturing method of an annular barium tungsten cathode emitter by adopting a process method without copper immersion, which improves the emission performance of the barium tungsten cathode and greatly prolongs the electric vacuum device. service life

Method used

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  • Manufacture method of annular barium-tungsten cathode emitter
  • Manufacture method of annular barium-tungsten cathode emitter
  • Manufacture method of annular barium-tungsten cathode emitter

Examples

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Embodiment 1

[0026] 1. Design the mold according to the cathode size.

[0027] Such as image 3 The cathode emitter of a certain type of magnetron shown is designed with an outer diameter of 10 mm, an inner hole diameter of 8 mm, and a length of 5 mm. After calculation, the size of the rough body of the sponge tungsten body is determined to be 11 mm in diameter of the outer circle, 7.5 mm in diameter of the inner hole, and 6 mm in length. Design tungsten billet pressing molding die such as Figure 4 As shown, the outer diameter of the core is 7.5 mm. Design brass jackets such as Figure 5 As shown, its bore diameter is 11 mm. Design the elastic centering fixture as Figure 6 As shown, the outer diameter of the expansion head is 7.88 mm.

[0028] 2. Put the tungsten billet forming mold into the latex sleeve, fill it with tungsten powder, fill it up and seal it with wire rope.

[0029] 3. Put the packaged workpiece into the hydraulic press, turn on the machine and increase the pressur...

Embodiment 2

[0037] 1, with embodiment 1.

[0038] 2. Put the tungsten billet forming mold into the latex sleeve, fill it with tungsten powder, fill it up and seal it with wire rope.

[0039] 3. Put the packaged workpiece into the hydraulic press, turn on the machine and increase the pressure to 2T / cm 2 , holding pressure for 2min for isostatic pressing.

[0040] 4. Clean the pressed workpiece with cleaning solution, remove the latex tube, take out the tungsten billet with the mold and put it in a tungsten mesh hydrogen furnace, and heat it to 1000°C for low-temperature sintering.

[0041] 5. Clamp the sintered tungsten billet with mold on the lathe. The diameter of the outer circle of the car reaches 11 mm. Remove the pressing die and cut to make the length reach 6 mm. The diameter of the inner hole is naturally formed by the pressing die to obtain a rough car. Tungsten billet.

[0042] 6. Put the rough car tungsten billet into the tungsten mesh hydrogen furnace, heat it to 1900℃, and ...

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Abstract

The invention relates to a manufacture method of an annular barium-tungsten cathode emitter. The manufacture method comprises the following steps of: putting a molding mould in a latex sleeve, loading tungsten powder and then packaging; carrying out isostatic pressing; washing and removing the latex sleeve and putting the molding mould in a tungsten-mesh hydrogen furnace for heating and sintering at low temperature; roughly lathing, unloading mould, and cutting off to obtain a rough lathed tungsten blank; putting the tungsten blank in the tungsten-mesh hydrogen furnace and heating and sintering at high temperature; coating an active substance aluminate, putting the tungsten blank into a molybdenum-shell hydrogen furnace and heating and dipping; clamping and boring; and fine lathing the excircle and both end faces. The invention adopts a copper dipping free process and uses a molybdenum rod to process the tungsten molding mould. The method is simple and practical, saves resources and has low production cost, and because processes of dipping and removing the copper are saved, a horizontal hydrogen furnace used for dipping the copper and a vacuum degassing furnace used for removing the copper in practical production are saved, thus funds of about 500 thousands RMB can be saved. The method has quite obvious application prospect in the production of electric vacuum devices.

Description

technical field [0001] The invention relates to the field of cathode manufacture of a magnetron, in particular to a method for manufacturing an annular barium-tungsten cathode emitter. Background technique [0002] The manufacture of the tungsten sponge of the traditional barium tungsten cathode is mostly realized by immersion copper method. This method is to put tungsten powder into the rubber casing and seal it well, and use 1.5~2T / cm 2 The pressure isostatic pressing molding, after removing the rubber sleeve, put the formed tungsten billet into a hydrogen furnace for sintering at a low temperature of 800-1000°C, and then rough-turn it into a certain shape on a lathe, then put it into a hydrogen furnace or a vacuum furnace to High-temperature sintering at a temperature of 1800-2000 ° C to obtain a sponge tungsten rod with a certain porosity. In order to facilitate machining, the sponge tungsten rod is heated to 1300-1600°C in a hydrogen furnace to impregnate copper to ob...

Claims

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Application Information

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IPC IPC(8): H01J23/05
Inventor 刘睿
Owner 甘肃虹光电子有限责任公司
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