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Preparation method of alkali metal source

A technology of alkali metal source and alkali metal salt, applied in chemical instruments and methods, metal material coating technology, lighting and heating equipment, etc., can solve the problem of uncontrollable powder particle size consistency, poor mixing uniformity, Problems such as debris, to achieve the effect of improving evaporation consistency, avoiding settlement, and good uniformity

Active Publication Date: 2021-01-15
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the brittleness of the raw material powder, especially the alkali metal salt powder, the conventional solid-phase mixing method is easy to cause secondary crushing of the raw material powder, and the particle size consistency of the powder cannot be controlled
The liquid phase mixing method can ensure that the raw material particles are not damaged, but because the density of the getter metal powder is higher than that of the alkali metal salt powder, it is easy to cause poor mixing uniformity due to different sedimentation speeds during the mixing and drying process

Method used

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  • Preparation method of alkali metal source
  • Preparation method of alkali metal source

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 50g of potassium chromate powder as the raw material of the alkali metal source into deionized water, and obtain high-purity potassium chromate powder after repeated evaporation and crystallization, filtering, cleaning, and drying. , D90 is 10um.

[0028] The high-purity 84g Zr ingot and 16g Al ingot were placed in an arc melting crucible, and arc melting was repeated to obtain a ZrAl alloy ingot, which was initially crushed by a jaw crusher, and then transferred to a high-energy ball mill for ball milling. The D90 was 30um and the purity was 99.91%.

[0029] Select 16g of ball-milled ZrAl alloy powder and 4g of potassium chromate powder, stir with 40ml of tert-butanol evenly, transfer to a planetary gravity mixer for uniform mixing, then transfer to a polytetrafluoroethylene container, and use liquid nitrogen to quickly cool the slurry .

[0030] Transfer the frozen slurry to a vacuum freeze dryer, set the partition temperature to -20° C., adjust the drying p...

Embodiment 2

[0033] Dissolve 50g of cesium chromate powder as an alkali metal source raw material into deionized water, and obtain high-purity cesium chromate powder after repeated evaporation and crystallization, filter the crystal, wash and dry, with a purity of 99.995%, and then transfer to a high-energy mill for ball milling , D90 is 100um.

[0034] Place high-purity 70g Zr ingots, 24.6gV ingots, and 5.4g Fe ingots in arc melting crucibles, and repeat arc melting to obtain ZrVFe alloy ingots, which are initially crushed by a jaw crusher, and then transferred to a high-energy ball mill for ball milling. The D90 is 150um, and the purity 99.95%.

[0035] Select 6g of ball-milled ZrVFe alloy powder and 0.4g of cesium chromate powder, stir with 8ml of tert-butanol evenly, transfer to a planetary gravity mixer for uniform mixing, then transfer to a polytetrafluoro container, and use liquid nitrogen to quickly cool the slurry material.

[0036] Transfer the frozen slurry to a vacuum freeze ...

Embodiment 3

[0038] Dissolve 50g of sodium molybdate powder as the raw material of the alkali metal source into deionized water, and obtain high-purity sodium molybdate powder after repeated evaporation and crystallization, filtering crystals, cleaning, and drying, with a purity of 99.99%, and then transfer the ball to a high-energy mill for ball milling , D90 is 1um.

[0039] Place high-purity 15gTi ingots, 45gZr ingots, and 40gV ingots in arc melting crucibles, and repeat arc melting to obtain TiZrV alloy ingots, which are initially crushed by jaw crushers, and then transferred to high-energy ball mills for ball milling. D90 is 10um, and the purity is 99.9%. .

[0040] Select 10g of ball-milled TiZrV alloy powder and 5g of sodium molybdate powder, stir with 18ml of tert-butanol evenly, transfer to a planetary gravity mixer for uniform mixing, then transfer to a polytetrafluoroethylene container, and use dry ice to quickly cool the slurry.

[0041] Transfer the frozen slurry to a vacuum ...

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Abstract

The invention discloses a preparation method of an alkali metal source. The preparation method mainly comprises the steps of precursor raw material purification, particle size control, mixing, quick cooling, vacuum freeze drying and the like. According to the invention, the granularity and the mixing state of raw materials are controlled, so that the reaction rate of the alkali metal source duringworking is controlled. The alkali source prepared on the basis of the method has the advantages of uniform raw material mixing, high particle size consistency and the like.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a preparation method of an alkali metal source. Background technique [0002] The low-light image intensifier is the core component of the low-light night vision device. The key to preparing a high-quality low-light image intensifier is to prepare a photocathode film with good uniformity and high purity. At present, the commonly used photocathode is an alkali metal antimonide thin film, which is prepared by alternately evaporating alkali metal and antimony metal from alkali metal source and antimony source powder at high temperature. [0003] In order to obtain a high-quality alkali metal thin film, it is necessary to strictly control the consistency of the evaporation rate of the alkali metal source and the high purity of the alkali metal vapor. The alkali metal source powder mainly includes alkali metal salt powder and getter metal powder. The particle size and mixing unifor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/06C23C16/44B01F7/00F26B5/06
CPCC23C16/06C23C16/44F26B5/06B01F27/00
Inventor 郭德宇杜昊瑾张庆猛熊玉华徐晓强
Owner GRIMAT ENG INST CO LTD