Preparation method of tungsten and cobalt solder for cathodes and brazing component manufacturing method and application thereof

A technology of solder and tungsten-cobalt, which is applied in the field of preparation of brazing components, can solve problems such as uneven welding gap size, poor solder adhesion, and weld sand holes, so as to prevent the precipitation of cathode active materials, reduce particle size, and improve The effect of uniformity

Active Publication Date: 2014-07-16
HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When filling the solder between the tungsten sponge and the molybdenum cylinder supporting it, due to the uneven size of the welding gap, the siphon effect of the weld seam will be uneven during brazing. During welding, the solder cannot completely flow into the weld, so that the solder forms fibroids on the end face of the tungsten sponge and the side wall of the molybdenum cylinder, resulting in poor adhesion of the solder, resulting in blisters in the weld, and even the molybdenum cylinder from the tungsten sponge. Phenomena such as falling off, affecting the quality of brazing

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  • Preparation method of tungsten and cobalt solder for cathodes and brazing component manufacturing method and application thereof
  • Preparation method of tungsten and cobalt solder for cathodes and brazing component manufacturing method and application thereof

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preparation example Construction

[0028] The present invention provides a kind of preparation method for the tungsten-cobalt solder of cathode, wherein, this method comprises:

[0029] (1) Reducing tungsten powder and cobalt powder;

[0030] (2) Grinding the mixture of reduced tungsten powder and cobalt powder to obtain tungsten-cobalt solder;

[0031] Wherein, the weight ratio of the tungsten powder to the cobalt powder is 1:2-5.

[0032] In the present invention, in order to more effectively prevent the precipitation of the cathode active material during welding, the weight ratio of the tungsten powder to the cobalt powder is preferably 1:2.5-4.5; more preferably 1:3-4 .

[0033] In the present invention, in order to make the reduction reaction of tungsten powder and cobalt powder more thorough, so that the purity of the obtained tungsten powder and cobalt powder is higher, in step (1), the method of reducing tungsten powder and cobalt powder can be It is method A or method B below.

[0034] Method A: he...

preparation example 1

[0059] Spread the tungsten powder and cobalt powder in the molybdenum bowl respectively, and account for 1 / 3 of the volume of the molybdenum bowl, transfer the molybdenum bowl containing the tungsten powder and cobalt powder to the molybdenum tube hydrogen furnace through the drying bottle, The tube hydrogen furnace heats up the temperature at a constant rate of 65°C / min for 12 minutes to 780°C, and performs a high-temperature reduction reaction in the molybdenum tube hydrogen furnace for 35 minutes in a dry hydrogen environment; weigh the obtained in the above steps at a ratio of 1:3 Tungsten powder and cobalt powder; After being mixed with the weighed tungsten powder and cobalt powder, be placed in the agate jar 3 that contains 30 agate balls 1 and 40 diameters of 10mm agate balls 2 with a diameter of 10mm; After the agate jar 3 with a mixture of tungsten powder and cobalt powder is covered with the first cover 4, put it into the outer cover 6, tighten the second cover 5, tig...

preparation example 2

[0061] Spread the tungsten powder and cobalt powder in the molybdenum bowl respectively, and account for 1 / 2 of the volume of the molybdenum bowl, transfer the molybdenum bowl containing the tungsten powder and cobalt powder to the molybdenum tube hydrogen furnace through the drying bottle, The tube hydrogen furnace raises the temperature at a constant rate of 88°C / min for 10 minutes to 880°C, and performs a high-temperature reduction reaction in the molybdenum tube hydrogen furnace for 40 minutes in a dry hydrogen environment; weigh the obtained in the above steps at a ratio of 1:3.5 Tungsten powder and cobalt powder; After being mixed with the weighed tungsten powder and cobalt powder, be placed in the agate jar 3 that contains 30 agate balls 1 and 40 diameters of 10mm agate balls 2 with a diameter of 10mm; After the agate jar 3 with a mixture of tungsten powder and cobalt powder is covered with the first cover 4, put it into the outer cover 6, tighten the second cover 5, tig...

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Abstract

The invention discloses a preparation method of tungsten and cobalt solder for cathodes and a brazing component manufacturing method and application thereof. The preparation method includes reducing tungsten powder and cobalt powder; grinding mixture of the tungsten powder and the cobalt powder which are reduced to obtain tungsten and cobalt solder, wherein the weight ratio of the tungsten powder and the cobalt powder is 1:2-5. The invention further provides a brazing component manufacturing method and application thereof in cathode components. Purity of the tungsten powder and the cobalt powder is improved by reducing the same at the high temperature, and then the mixture of the tungsten powder and the cobalt powder which are reduced according to a certain proportion is ground, so that particle size of the tungsten and cobalt solder is greatly reduced, and uniformity of the same is improved. Meanwhile, precipitation of cathodal active materials can be prevented during welding by controlling the mixture of the tungsten powder and the cobalt powder which are reduced within the certain proportion, and stability of cathode matrixes is increased.

Description

technical field [0001] The invention relates to a preparation method of tungsten-cobalt solder for cathodes, a preparation method of a brazing assembly and applications thereof. Background technique [0002] In the prior art, the cathode base body of a large-sized traveling wave tube is usually made by stamping refractory metal powder into a cylindrical shape, and then undergoing high-temperature sintering, salt immersion, two-turn machining and brazing processes. In this production process, the welding between the tungsten sponge and the molybdenum cylinder supporting it is an indispensable process in the preparation of the cathode base. The traditional welding processes include cathode electron beam welding and laser beam welding, but improper use of shielding gas often causes cracks and brittleness of the molybdenum cylinder, which in turn causes shedding. Keep a close fit between them, otherwise the molybdenum cylinder will melt and shrink first, resulting in inability ...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K1/008B22F1/00B02C17/10B02C17/20
CPCB23K1/008B23K1/19B23K35/3046B23K2101/36B22F1/145
Inventor 吴华夏孟昭红陈爱民于晨晨卞磊邹莺歌王莹
Owner HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
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