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Preparation method of electrode for vacuum X-ray tube

A technology for X-ray tubes, which is applied in the field of preparation of electrodes for vacuum X-ray tubes, can solve problems such as difficulties in the preparation of electrodes for ray tubes, and achieve the effects of low cost, simple experimental operation, and good weldability

Inactive Publication Date: 2018-10-19
JINLING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of difficult preparation of electrodes for ray tubes and easy distortion due to environmental influences, the present invention prepares an X-ray tube that uses high-purity silver powder as the conductive phase, glass powder as the binder, and adjusts the slurry with an organic solvent and then sinters it. Electrodes for ray tubes, which can suppress evaporation and produce high sputtering resistance during electrode discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of silver powder Ⅰ: select 200g silver ingot, place it in a graphite crucible in a DC arc plasma device, feed hydrogen and argon in a ratio of 1:3 and vacuumize for sealing, control the cathode current to 300A, and the inflation pressure to be 0.02MPa, the silver ingot is rapidly heated and melted by the plasma, evaporates to form metal vapor, and is scattered to the powder collection chamber with the circulating gas generated by the fan. The average particle size of the prepared silver powder I is 100nm.

Embodiment 2

[0029] (1) 10 parts of silver powder I prepared in Example 1, 0.5 part of oleic acid and 0.5 part of lauryl hydroxystearic acid are added in 100 parts of ethanol, centrifugal separation after ultrasonic dispersion, placed in a vacuum oven for drying, to obtain Highly dispersible nano-silver powder II; control the drying temperature to 50°C;

[0030] (2) Take by weighing 40 parts of silver powder II, 0.4 part of glass powder and 59.6 parts of organic vehicle to prepare conductive silver paste;

[0031] (3) Coat the conductive silver paste in (2) above on the inside of the glass ray tube, place it in a high-temperature sintering furnace at 500°C and bake it, keep it warm for 30 minutes, and form electrodes after solidification;

[0032] Wherein the formula of the organic carrier in the above (2) is: 35 parts of terpineol, 38 parts of ethyl acetate, 2 parts of ethyl cellulose, 6 parts of Span-85, 2 parts of hydrogenated castor oil, 15 parts of diphthalic acid Butyl ester, 2 part...

Embodiment 3

[0035] (1) 10 parts of silver powder I prepared in Example 1, 0.3 part of oleic acid and 0.3 part of lauryl hydroxystearic acid are added in 100 parts of ethanol, centrifugal separation after ultrasonic dispersion, placed in a vacuum oven for drying, to obtain Highly dispersible nano-silver powder II; control the drying temperature to 50°C;

[0036] (2) Take by weighing 50 parts of silver powder II, 1 part of glass powder and 59 parts of organic vehicle to prepare conductive silver paste;

[0037] (3) Coat the conductive silver paste in (2) above on the inside of the glass ray tube, place it in a high-temperature sintering furnace and bake it at 550°C, keep it warm for 20 minutes, and form an electrode after solidification;

[0038] Wherein the formula of the organic carrier in the above (2) is: 35 parts of terpineol, 35 parts of ethyl acetate, 5 parts of ethyl cellulose, 6 parts of Span-85, 2 parts of hydrogenated castor oil, 15 parts of diphthalic acid Butyl ester, 2 parts ...

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Abstract

The invention discloses a preparation method of an electrode for a vacuum X-ray tube, comprising the following steps: (a) using a silver ingot as a raw material, placing the silver ingot in a graphitecrucible of a direct current arc plasma device, introducing hydrogen gas and argon gas, using a vacuum pump to vacuumize and seal the device, and preparing silver powder I; (b) preparing a dispersingagent: adding the silver powder I obtained in the step (a) to alcohol, adding oleic acid and 12-hydroxystearic acid, and performing ultrasonic dispersion and centrifugal separation to obtain silver powder II; (c) performing vacuum drying of the silver powder II prepared in the step (b), adding a glass powder and an organic carrier to prepare a conductive silver paste; (d) applying the conductivesilver paste prepared in the step (c) to a ray tube, and placing the ray tube in a sintering furnace to be calcined and solidified to form an electrode conductor. The method adopts the volatile organic carrier, performs the surface modification of the silver powder by the dispersing agent, and is simple in experiment operation and low in cost, and the silver electrode has good conductivity and good welding performance.

Description

technical field [0001] The invention belongs to the technical field of electrode materials and preparations for vacuum X-ray tubes, and in particular relates to a method for preparing electrodes for vacuum X-ray tubes. Background technique [0002] Nano-silver powder is widely used as a conductive and heat-conducting material because of its high electrical and thermal conductivity. The prepared conductive paste is mostly used in sealing bags and connections; in addition, the miniaturization of microelectronic components is also inseparable from nano-silver powder. In the production process of the conductive paste, silver powder is added and then sintered to prepare an electrode product with conductive function, which can form a conductive circuit. [0003] At present, nano-silver powder is usually prepared by chemical reduction method, which introduces a layer of surfactant on the surface of silver powder, which will affect its conductivity and the performance of the prepare...

Claims

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Application Information

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IPC IPC(8): H01J9/02
CPCH01J9/02
Inventor 张小敏
Owner JINLING INST OF TECH
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