Scandium-strontium-containing active material for thermal cathode material

A technology of active material and hot cathode, which is applied in the field of environmental functional material preparation, can solve the problems of cathode emission current density and low hot cathode emission current density, and achieve the effects of safe production, high promotion and application value, and improvement of uniformity

Pending Publication Date: 2020-10-02
西安稀有金属材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, vacuum electronic devices have used hot cathodes as their electron emission sources. However, the main reason for restricting high-power and high-frequency microwave vacuum electronic devices is the low emission current density of hot cathodes. Density needs

Method used

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  • Scandium-strontium-containing active material for thermal cathode material
  • Scandium-strontium-containing active material for thermal cathode material
  • Scandium-strontium-containing active material for thermal cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The preparation process of the scandium-strontium-containing active material used in the hot cathode material in this embodiment includes the following steps:

[0036] Step 1, dissolving ammonium carbonate powder in water and heating to 40°C to prepare 500mL solution A with a concentration of 1mol / L;

[0037] Step 2, dissolving scandium nitrate hexahydrate, strontium nitrate, aluminum nitrate nonahydrate, barium nitrate and calcium nitrate tetrahydrate powder in water and heating to 40°C to prepare 500mL solution B; the amount of scandium nitrate hexahydrate in the solution B The concentration is 0.01mol / L, the concentration of strontium nitrate is 0.01mol / L, the concentration of aluminum nitrate nonahydrate is 0.04mol / L, the concentration of barium nitrate is 0.06mol / L, and the concentration of calcium nitrate tetrahydrate is 0.01mol / L ;

[0038] Step 3: Add solution A obtained in step 1 to solution B at 40°C at 0.1 mL / s, keep stirring and react for 1 hour, then let i...

Embodiment 2

[0044] The preparation process of the scandium-strontium-containing active material used in the hot cathode material in this embodiment includes the following steps:

[0045] Step 1. Dissolve ammonium bicarbonate powder in water and heat to 60°C to prepare 500 mL of solution A with a concentration of 2 mol / L;

[0046] Step 2, dissolving scandium nitrate hexahydrate, strontium nitrate, aluminum nitrate nonahydrate, barium nitrate and calcium nitrate tetrahydrate powder in water and heating to 60°C to prepare solution B; the concentration of scandium nitrate hexahydrate in solution B is 0.02mol / L, the concentration of strontium nitrate is 0.02mol / L, the concentration of aluminum nitrate nonahydrate is 0.06mol / L, the concentration of barium nitrate is 0.08mol / L, and the concentration of calcium nitrate tetrahydrate is 0.02mol / L;

[0047] Step 3. Add solution A obtained in step 1 to solution B at 50°C at 0.5mL / s and keep stirring for 3 hours, then let it stand for precipitation to...

Embodiment 3

[0050] The preparation process of the scandium-strontium-containing active material used in the hot cathode material in this embodiment includes the following steps:

[0051] Step 1, mix ammonium carbonate and ammonium bicarbonate powder according to the molar ratio of 1:1, dissolve in water and heat to 50° C. to prepare 500 mL of solution A with a total solute concentration of 1.5 mol / L;

[0052] Step 2, dissolving scandium nitrate hexahydrate, strontium nitrate, aluminum nitrate nonahydrate, barium nitrate and calcium nitrate tetrahydrate powder in water and heating to 50°C to prepare 500mL solution B; the amount of scandium nitrate hexahydrate in the solution B The concentration is 0.015mol / L, the concentration of strontium nitrate is 0.015mol / L, the concentration of aluminum nitrate nonahydrate is 0.05mol / L, the concentration of barium nitrate is 0.07mol / L, and the concentration of calcium nitrate tetrahydrate is 0.015mol / L ;

[0053] Step 3. Add solution A obtained in st...

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Abstract

The invention discloses a scandium-strontium-containing active substance for a thermal cathode material. The scandium-strontium-containing active substance is prepared by the following steps of addinga solution A prepared from ammonium carbonate or / and ammonium bicarbonate into a solution B prepared from scandium nitrate hexahydrate, strontium nitrate, aluminum nitrate nonahydrate, barium nitrateand calcium nitrate tetrahydrate, reacting to obtain a precipitate, and sintering the precipitate. A precursor raw material reacts in a solution to obtain a precipitate, the scandium-strontium-containing active substance is obtained through sintering, the scandium-strontium-containing active substance with high electron emission capacity is obtained by introducing rare earth elements scandium andstrontium, so that the electron emission capacity of the thermal cathode material is improved, and the preparation process is simple, the cost is low, and the popularization and application values are relatively high.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental functional materials, and in particular relates to a scandium-strontium-containing active material used for hot cathode materials. Background technique [0002] The development of vacuum electronic devices and related technologies depends on the comprehensive strength of a country's national defense science and technology, and determines the development level of the country's military microwave weapons and equipment. At present, only the United States, Russia, the United Kingdom, France, Japan, Germany and China and other military powers with strong comprehensive scientific research capabilities have the ability to develop, produce and system apply high-performance microwave vacuum electronic devices. Carrying out research on high-power, high-frequency vacuum electronic devices, occupying the commanding heights of science and technology in related fields, and developing new hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J1/14H01J23/04
CPCH01J1/14H01J23/04H01J2201/19H01J2223/04
Inventor 刘璐黎栋栋张剑峰孙国栋张思雨邱龙时胡小刚潘晓龙吴金平张于胜
Owner 西安稀有金属材料研究院有限公司
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