Preparation method of releaser for alkali metal releasing agent

A release agent and releaser technology, which is applied in the field of preparation of releasers used in alkali metal releasers, can solve the problems of releaser consistency and stability to be improved, so as to improve performance consistency and stability, ensure consistency and Stability, the effect of ensuring the consistency of thickness

Active Publication Date: 2019-06-21
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The releaser prepared by this method has the advantages of simple design, convenient processing, low cost, etc., but it still has problems in the consistency and stability of parameters such as batch production efficiency, powder loading, resistance, and alkali metal vapor release current of the releaser. needs to be improved

Method used

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  • Preparation method of releaser for alkali metal releasing agent
  • Preparation method of releaser for alkali metal releasing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Select ZrAl16 getter as the reducing agent, the selected cesium salt is cesium chromate, and the particle size of the reducing agent powder is 10-40 μm; the atomic ratio (Cs / Zr) of Cs in the cesium salt and Zr in the reducing agent in the mixed powder is 0.7. Put the mixed powder into a nickel-chromium alloy tube with an outer diameter of 5.0mm and a wall thickness of 0.05mm, and when it is drawn to an outer diameter of 1.05mm and a wall thickness of 0.04mm, the number of passes required is 23, and the drawing speed is 10mm / s ~30mm / s. The powder loading amount of the finally obtained releaser is 50±1mg, the sample mass is 80±1mg, and the resistance is 0.3±0.02Ω. Put the prepared releaser into the low-light night vision device to test the alkali metal release performance. The results show that the cesium vapor release current of 6 releasers used in series in different batches is 1.8±0.1A, and the corresponding cesium releaser works The heating power is 4.5±0.2W.

Embodiment 2

[0036] Select ZrAl16 getter as the reducing agent, the selected cesium salt is cesium chromate, and the particle size of the reducing agent powder is 10-40 μm; the atomic ratio (Cs / Zr) of Cs in the cesium salt and Zr in the reducing agent in the mixed powder is 0.7. Put the mixed powder into a nickel-chromium alloy tube with an outer diameter of 7.0mm and a wall thickness of 0.06mm, and draw it to an outer diameter of 1.15mm and a wall thickness of 0.05mm. The required passes are 28 times, and the drawing speed is 35mm / s~ 70mm / s. The final powder loading of the Cs releaser was 55±1mg, the sample mass was 95±1mg, and the resistance was 0.23±0.02Ω. Put the prepared releaser into the low-light night vision device to test the alkali metal release performance. The results show that the cesium vapor release current of 6 releasers used in series in different batches is 2.1±0.1A, and the corresponding cesium releaser works The heating power is 4.9±0.2W.

Embodiment 3

[0038] The ZrAl16 getter is selected as the reducing agent, and the selected rubidium salt is rubidium chromate. In order to facilitate the contact of the rubidium compound and the reducing agent, the material in powder form is used for mixing. The particle diameter of the reducing agent powder is 10-40 μm; the atomic ratio (Rb / Zr) of Rb in the cesium salt in the mixed powder to Zr in the reducing agent is 0.6. Put the mixed powder into a nickel-chromium alloy tube with an outer diameter of 6.0mm and a wall thickness of 0.05mm, and draw it to an outer diameter of 1.2mm and a wall thickness of 0.035mm. The required passes are 28 times, and the drawing speed is 20mm / s~ 50mm / s. The final powder loading of the Rb releaser was 48±1.0mg, the sample mass was 79±1.0mg, and the resistance was 0.29±0.02Ω. Put the prepared releaser into the low-light night vision device to test the alkali metal release performance. The results show that: the rubidium vapor release current of 6 releaser...

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Abstract

The invention discloses a preparation method of a releaser for an alkali metal releasing agent, which comprises the following steps: (1) cleaning and drying a nichrome tube, wherein the outer diameterof the nichrome tube is 4.0-7.0 mm, and the wall thickness is 0.05-0.10 mm; (2) uniformly mixing high-purity alkali metal salt and reducing agent powder by using a powder mixing device, and filling the mixed powder into a nickel-chromium alloy tube; (3) cold drawing the nickel-chromium alloy tube after filling powder, and drawing the nickel-chromium alloy tube until the outer diameter is 1.0-1.5mm and the wall thickness is 0.03-0.06 mm, and the required pass is 8-40; (4) laser drilling under the protection of inert gas; (5) cutting the main body part of the releasing agent; (6) connecting the two ends of the main body part with end electrodes; (7) and vacuum packaging the prepared releaser. The preparation method of the releaser for the alkali metal releasing agent can improve the production efficiency of the releaser used by the alkali metal releasing agent, and significantly improve the performance consistency and the stability of the releaser of the releasing agent, thereby ensuring the thickness consistency of the releasing agent film on the surface of the photocathode and the consistency and the stability of the performance of the photocathode.

Description

technical field [0001] The invention relates to a preparation method of a releaser used in an alkali metal releaser, which can meet the use requirements of the third-generation low-light night vision device for the alkali metal releaser. Background technique [0002] The performance of low-light night vision devices depends first on the performance of the photocathode. An excellent photocathode should have the characteristics of high sensitivity (high quantum efficiency), wide spectral response, small dark current, and stable performance. The core component of the third-generation low-light night vision device is the negative electron affinity (NEA) photocathode, and one of the keys to preparing a high-quality NEA photocathode is the cesium (or alkali metal such as rubidium) oxygen activation process of the cathode. During activation, it is necessary to use an alkali metal releasing agent to vapor-deposit cesium or rubidium vapor, O vapor, etc. with good uniformity and high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/00H01J9/12
Inventor 熊玉华徐晓强杨志民崔建东赵彦弘
Owner GRIMAT ENG INST CO LTD
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