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Preparation method of pressing type scandium containing dispenser cathode based on microwave sintering

A microwave sintering and diffusion cathode technology, which is applied in the manufacture of thermionic cathodes, thermionic cathodes, electron emission electrodes/cathodes, etc., can solve the problems of high material consumption and energy consumption in the sintering process, complex microfocus x-ray preparation process, and low dimensional accuracy. And other issues

Inactive Publication Date: 2016-10-26
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems that the existing technology cannot satisfy the development of micro-focus X-rays and the preparation process is complex, the dimensional accuracy is low, the material consumption and energy consumption of the sintering process are high, and the present invention provides a method for preparing a compressed scandium-containing diffusion cathode based on microwave sintering, realizing The cathode is sintered in one molding, the sintering shrinkage ratio is significantly reduced, and the sintering time is greatly reduced, the structure is uniform, the cathode emission repeatability is good, and it has excellent emission performance at 950°C

Method used

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  • Preparation method of pressing type scandium containing dispenser cathode based on microwave sintering
  • Preparation method of pressing type scandium containing dispenser cathode based on microwave sintering
  • Preparation method of pressing type scandium containing dispenser cathode based on microwave sintering

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Embodiment 1

[0029] First, dissolve 20.34g of barium nitrate, 4.60g of calcium nitrate tetrahydrate, 14.61g of aluminum nitrate nonahydrate, 36.84g of scandium nitrate hexahydrate, and 160.668g of ammonium metatungstate in deionized water, and stir until they are all dissolved. Barium, calcium nitrate, and aluminum nitrate are prepared to make 411 salt solution, then mix scandium nitrate and ammonium metatungstate solution, and finally add 411 salt solution slowly, and at the same time stir continuously with a stirrer to make it fully mixed, the final total concentration 68.52g / L, the precursor powder was obtained by spray drying, the feed rate was 600ml / h, and the blast rate was 0.4m 3 / min-0.6m 3 / min, the inlet temperature is 150°C, and the outlet temperature is stable at 90-96°C; secondly, the obtained precursor powder is decomposed in a muffle furnace, and the powder is kept at 550°C in an atmospheric atmosphere (or oxygen atmosphere) for about 3 hours to remove The N element in the ...

Embodiment 2

[0031] First, dissolve 6.78g of barium nitrate, 1.53g of calcium nitrate tetrahydrate, 4.78g of aluminum nitrate nonahydrate, 12.28g of scandium nitrate hexahydrate, and 56.61g of ammonium metatungstate in deionized water, and stir until they are completely dissolved. Barium, calcium nitrate, and aluminum nitrate are prepared to make 411 salt solution, then mix scandium nitrate and ammonium metatungstate solution, and finally add 411 salt solution slowly, and at the same time stir continuously with a stirrer to make it fully mixed, the final total concentration 69.28g / L, the precursor powder was obtained by spray drying, the feed rate was 600ml / h, and the blast rate was 0.4m 3 / min-0.6m 3 / min, the inlet temperature is 150°C, and the outlet temperature is stable at 90-96°C; secondly, the obtained precursor powder is decomposed in a muffle furnace, and the powder is kept at 550°C in an atmospheric atmosphere (or oxygen atmosphere) for about 3 hours to remove The N element in t...

Embodiment 3

[0033]First, dissolve 20.34g of barium nitrate, 4.60g of calcium nitrate tetrahydrate, 14.61g of aluminum nitrate nonahydrate, 36.84g of scandium nitrate hexahydrate, and 160.668g of ammonium metatungstate in deionized water, and stir until they are all dissolved. Barium, calcium nitrate, and aluminum nitrate are prepared to make 411 salt solution, then mix scandium nitrate and ammonium metatungstate solution, and finally add 411 salt solution slowly, and at the same time stir continuously with a stirrer to make it fully mixed, the final total concentration 70.32g / L, the precursor powder was obtained by spray drying, the feed rate was 300ml / h, and the blast rate was 0.4m 3 / min-0.6m 3 / min, the inlet temperature is 150°C, and the outlet temperature is stable at 90-96°C; secondly, the obtained precursor powder is decomposed in a muffle furnace, and the powder is kept at 550°C in an atmospheric atmosphere (or oxygen atmosphere) for about 3 hours to remove The N element in the p...

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Abstract

The invention belongs to the technical field of rare earth indissolvable metal cathode materials, and relates to a preparation method of a pressing type scandium containing dispenser cathode based on microwave sintering. The preparation method comprises the steps that various kinds of nitrate and ammonium metatungsten are dissolved in plasma water to be prepared into an evenly-mixed solution, and precursor powder with even particles is obtained through spray drying; then the precursor powder is subjected to decomposition and secondary reduction to obtain doped tungsten powder with elements distributed evenly; and finally a microwave sintering method is used for preparing the cathode through one-time sintering. Sintering one-time forming of the cathode is finally achieved, the sintering shrinkage ratio is remarkably reduced, the sintering time is greatly shortened, the structure is uniform, repeatability is good, and excellent launching performance is achieved at the temperature being 950 DEG C.

Description

technical field [0001] The invention belongs to the technical field of rare earth refractory metal cathode materials, relates to a tungsten-based composite material, and more specifically relates to a method for preparing a compact scandium-containing diffusion cathode based on microwave sintering. Background technique [0002] In recent years, the application of micro-focus X-rays (micro-focus: less than 100um×100um) in medical treatment, health and aerospace has developed rapidly, especially the research and development of small-focus and high-power X-ray devices has attracted more and more attention from researchers in different fields. focus on. The core technology of micro-focus X-ray application is the micro-focus X-ray source—micro-area X-ray tube cathode. However, with the improvement of tube resolution and power, people's demand for small-sized and high-power cathodes is becoming more and more urgent, so there is an urgent need Developed a cathode with high dimensi...

Claims

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Application Information

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IPC IPC(8): B22F3/10H01J9/04
CPCB22F3/10B22F2999/00H01J9/04H01J35/064B22F2202/11B22F3/105B22F9/026B22F9/30B22F2003/1054B22F2998/10H01J1/28H01J19/22H01J35/06B22F9/22B22F3/02C22B34/36
Inventor 刘伟田明创王金淑周帆贾新建董丽然赖陈杨韵斐张权祖冠男
Owner BEIJING UNIV OF TECH
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