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Manufacturing method for Li-B base air suction material

A technology of getter material and getter, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of difficulty in preparing lithium-boron alloy, difficulty in preparing lithium-boron alloy getter sheet, etc., so as to avoid spontaneous combustion phenomenon , The effect of solving processing difficulties and low strength

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

[0013] The invention provides a method for preparing a Li-B-based getter material, which solves the problem that the existing one-step synthesis method is difficult to prepare a lithium-boron alloy that meets the getter material standard and that it is difficult to prepare a lithium-boron alloy getter by using a powder making and pressing method. Air piece conundrum

Method used

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  • Manufacturing method for Li-B base air suction material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 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;

[0055] 2. Put the ingredients into an argon-protected resistance heating furnace and heat to 370°C, keep warm and stir for 1 hour, so that the powder is completely immersed in it; then cool to room temperature; when heating, control the heating rate to 2°C / min;

[0056] 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 10 mm;

[0057] 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 0.5 hours to obtain a surface-passivated getter piece. ;

[0058] 5. Both the pre-alloyed sheet and the surfa...

Embodiment 2

[0061] 1. Use metal lithium ingots, fine boron powder, carbon powder, boron carbide powder, and magnesium powder according to the ingredients of 44Li-43.6B-12C-1Mg;

[0062] 2. Put the ingredients into an argon-protected resistance heating furnace and heat to 360°C, keep warm and stir for 2 hours, so that the powder is completely immersed in it; then cool to room temperature; when heating, control the heating rate to 4°C / min;

[0063] 3. The cooled ingot is billeted and cold-rolled in an air with a relative humidity of less than 2% to become a 1×50 (mm) strip, which is stamped into a pre-alloyed disc with a diameter of 10 mm;

[0064] 4. Put the pre-alloyed wafer into an argon-protected resistance furnace and heat it to 600°C for 30 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. ;

[0065] 5. Both the pre-alloyed sheet and the surface-passivated suc...

Embodiment 3

[0068] 1. Use metal lithium ingots, fine boron powder, carbon powder, boron carbide powder, magnesium powder, and aluminum powder according to the ingredients of 44Li-43.6B-12C-0.5Mg-0.5Al;

[0069]2. Put the ingredients into an argon-protected resistance heating furnace and heat to 355°C, keep warm and stir for 3 hours, so that the powder is completely immersed in it; then cool to room temperature; when heating, control the heating rate to 5°C / min;

[0070] 3. The cooled ingot is billeted and cold-rolled in an air with a relative humidity of less than 2% to become a 1×50 (mm) strip, which is stamped into a pre-alloyed disc with a diameter of 10 mm;

[0071] 4. Put the pre-alloyed wafer into an argon-protected resistance furnace and heat it to 700°C for 5 minutes, cool it, take it out at room temperature and in air with a relative humidity less than 2%, and place it for 4 hours. Become a surface passivated getter piece.

[0072] 5. Both the pre-alloyed sheet and the surface-p...

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Abstract

The invention discloses a manufacturing method for a Li-B base air suction material. According to the manufacturing method, by mass, 30-70 % of Li, 20-50 % of B, 0.3-6 % of Mg and / or Al and 0.01-18% of C are heated to 350-370 DEG C, heat preservation is conducted, the components are stirred evenly and cooled along with a furnace, and Li-B base prealloy is obtained; the Li-B pre-alloy is processed into the shape needed by an air suction component at the room temperature in air with relative humidity lower than or equal to 2 %, the Li-B prealloy is heated to 600-700 DEG C in protective atmosphere, heat preservation is conducted on the Li-B alloy for 5-30 minutes and a finished product is obtained. The manufacturing method for the Li-B base air suction material not only solves the problem that Li-B alloy meeting the air suction material standard cannot be manufactured through a one-step synthesis method in the prior art and the problem that Li-B alloy air suction pieces cannot be manufactured through the powder process pressing method, but also reduces the difficulty of controlling the structure of the Li-B base air suction material, and improves the uniformity of the structure of the material; meanwhile, the spontaneous combustion phenomenon is successfully avoided, and the surface passivation of the Li-B base air suction material is achieved. The manufacturing method for the Li-B base air suction material is simple in preparation technology and can be produced in an industrialized mode conveniently.

Description

technical field [0001] The invention relates to a preparation method of a Li-B-based getter material, belonging to the technical field of getter material preparation. technical background [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 r...

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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