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Li-B base air suction material

A technology for getter materials and raw materials, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of easy blockage of holes, loss of getter performance, danger, etc., and achieve the effect of broadening application fields and improving performance.

Inactive Publication Date: 2014-01-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main problems of using pure lithium-boron alloy as a getter are: ①In the past, it was difficult to control the synthesis of lithium-boron alloy, and the structure and performance of the synthesized material were unstable
②Alloys have high surface activity and are prone to violent reactions with air. They can only be stored in inert gas and vacuum, and their application fields are greatly limited.
③Exceeding 200°C, the metal lithium phase will melt, the pores on the surface of the getter will be easily blocked, and the material will lose its gas-absorbing performance
[0010] For example, when a high-power lithium-ion battery used as power is used for a long time, there will always be trace gas (mainly hydrogen, organic gas, etc.), and the accumulated gas will cause the battery’s airtight packaging to bulge. Once the packaging is damaged, it will invalidate the battery and create a hazard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Use metal lithium ingots, fine boron powder, carbon powder, boron carbide powder, and magnesium powder according to the ingredients of 42Li-45B-12C-1Mg;

[0046] 2. Put the ingredients into an argon-protected resistance heating furnace and heat to 370 ° C, keep warm; stir for 1 hour after the metal is melted, so that the powder is completely immersed in it, and then cool to room temperature;

[0047] 3. The cooled ingot is billeted and cold-rolled at room temperature in an air with a relative humidity of less than 2% to form a 1×50 (mm) strip, which is stamped into a pre-alloyed disc with a diameter of 10mm. Obtain the in-situ suction piece;

[0048] 4. Put the pre-alloyed disc into an argon-protected resistance furnace and heat it to 700°C for 15 minutes. After cooling to room temperature, take it out and put it in the air with a relative humidity of less than 2% for 3 hours to obtain a surface-passivated getter piece. ;

[0049] 5. Both the in-situ suction sheet ...

Embodiment 2

[0052] 1 Use metal lithium ingot, fine boron powder, carbon powder, boron carbide powder, magnesium powder according to 40.1Li-41.6B-17.3C-1Mg ingredients;

[0053] 2 Put the ingredients into an argon-protected resistance heating furnace and heat to 370°C, keep warm;

[0054] 3 After the metal is melted, stir for 1 hour to fully immerse the powder in it, and then cool to room temperature; the cooled ingot is opened at room temperature and in air with a relative humidity of less than 2%, and cold-rolled to become 1×50( mm), which is stamped into a pre-alloyed disc with a diameter of 10mm to obtain an in-situ suction sheet;

[0055] 4. Put the pre-alloyed disc into an argon-protected resistance furnace and heat it to 700°C for 15 minutes. After cooling to room temperature, take it out and put it in the air with a relative humidity of less than 2% for 3 hours to obtain a surface-passivated getter piece. ;

[0056] 5. Both the in-situ suction sheet and the surface passivation su...

Embodiment 3

[0059] 1. Use metal lithium ingots, fine boron powder, carbon powder, boron carbide powder, and aluminum powder according to the ingredients of 41.8Li-44.4B-12.3C-1.5Al;

[0060] 2. Put the ingredients into an argon-protected resistance heating furnace and heat to 370°C to keep warm;

[0061] 3. After the metal is melted, stir for 1 hour to fully immerse the powder in it, and then cool to room temperature; the cooled ingot is opened at room temperature and in air with a relative humidity of less than 2%, and cold-rolled to become 1×50 (mm) of the strip, which is stamped into a pre-alloyed disc with a diameter of 10mm to obtain an in-situ suction sheet;

[0062] 4. Put the pre-alloyed wafer into an argon-protected resistance furnace and heat it to 700°C for 15 minutes. After cooling to room temperature, take it out and put it in the air with a relative humidity of less than 2% for 3 hours to obtain a surface-passivated getter piece. ;

[0063] 5. Both the in-situ suction shee...

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PUM

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Abstract

The invention relates to a Li-B air suction material, and belongs to the technical field of manufacturing of air suction materials. The Li-B air suction material comprises the following components, by mass, 30-70 % of Li, 20-50 % of B, 0.3-6 % of Mg and / or Al, and 0.01-18 % of C. The sum of the mass percentage of all the components is 100 %. The using temperature of the Li-B base air suction material can exceed 200 DEG C, and the Li-B base air suction material can normally and efficiently suck air when used at high temperature. The Li-B base air suction material not only is applied to the technical field of vacuum electronics, but also can be used in emerging technology fields which have special requirements for air suction materials.

Description

technical field [0001] The invention relates to a Li-B-based getter material, which belongs to the technical field of getter material preparation. Background technique [0002] The vacuum degree of vacuum electrical devices will decrease after long-term use. In order to maintain the vacuum degree in the vacuum container for a long time, in order to prevent the influence of the micro-leakage of the container material and the material outgassing on the vacuum, it is effective to put the getter material in the container. Methods. The most widely used getters are evaporable getter materials and non-evaporable getter materials. The evaporable getter is mainly based on barium-based alloy, that is, after the getter alloy is sealed in the container, it is heated to evaporate the alloy on the inner surface of the vacuum container to obtain an alloy film, and the fresh surface of the alloy film has a good gas absorption effect. Function; this method has special requirements on heati...

Claims

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Application Information

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IPC IPC(8): C22C24/00C22C29/14C22C30/00C22C32/00C22C1/08B01J20/04
Inventor 刘志坚欧振德曹二斌黄海锋文佑才高建新
Owner CENT SOUTH UNIV
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