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Device and method for deeply purifying aluminum-lithium alloy melt

An aluminum-lithium alloy, deep purification technology, applied in the direction of improving process efficiency, etc., can solve the problems of low hydrogen removal and slag removal efficiency, low purification efficiency, and ingot metallurgical quality cannot be guaranteed.

Active Publication Date: 2021-04-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the liquid aluminum-lithium alloy dissolves the existing industrially used refractory materials, the purification methods commonly used in the modern aluminum processing industry, such as refining outside the furnace using graphite rotors and filtering with ceramic filters, cannot be used for aluminum-lithium alloys; At present, the main method of purifying the aluminum-lithium alloy melt is to put it in the furnace to draw a low vacuum, then fill it with argon, and stir the melt with argon blowing. This method has low purification efficiency, low efficiency of hydrogen removal, especially slag removal, and large consumption of argon. ; therefore, the metallurgical quality of the ingot cannot be guaranteed

Method used

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  • Device and method for deeply purifying aluminum-lithium alloy melt
  • Device and method for deeply purifying aluminum-lithium alloy melt
  • Device and method for deeply purifying aluminum-lithium alloy melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073]Device structure of aluminum lithium alloy melt depth purificationfigure 1 As shown, composed of the purge furnace A, the insulation furnace gasket B and the thermal insulating furnace C;

[0074]Purifier A structurefigure 2 As shown, top viewimage 3 As shown, A-A directionFigure 4 As shown, including the purge furnace crucible A11, the purge furnace body A10, the upper plate A27, and the lower plate A31; the purge furnace body A10 is provided outside the sidewall of the purified furnace crucible A11, the top of the purification furnace crucible A11 is sealed with the upper plate A27 sealing connection The bottom plate of the purification furnace crucible A11 is provided with a guide tube A1 and a leakage tube A33 connect the bottom plate of the purge furnace crucible A11, and the drainage tube A1 and the leakage tube A33 pass through the lower plate A31 below the purge furnace. The discharge pipe A33 is provided with a grid A29, and the grid A29 is covered with a web A30; the ar...

Embodiment 2

[0103]Device structure of aluminum lithium alloy melt purification is the same as in Example 1 ,;

[0104]Methods The same embodiments are:

[0105](1) The aluminum alloy treated was 2195Al-Li alloy, and its ingredient was 4.2%, Mg0.43%, Li 1.28%, Zr 0.13%, Ag 0.38%, FE 0.09%, Si0.04%. The margin is Al;

[0106](2) When depth purification, the aluminum lithium alloy passes into the temperature of 712 ° C, from the temperature of 702 ° C from the outflow port C5, purifying time 20 min; when continuous casting, the casting speed is 70 mm / min, The ingot is 200mm in diameter; the maximum degassing size is 0.9 mm, the inclusion area fraction is 0.03%, and the ultrasonic flaw detection is A, the hydrogen content is 0.08 ppm;

[0107]With a conventional chute argon protective continuous casting method, the aluminum lithium alloy of the same material is cast, the maximum scales of the ingot are 3.2mm, the inclosure area fraction is 0.12%, and the ultrasonic flaw is B, hydrogen content 2.6. PPM;

[0108]...

Embodiment 3

[0110]Device structure of aluminum lithium alloy melt purification is the same as in Example 1 ,;

[0111]Methods The same embodiments are:

[0112](1) The above-treated aluminum lithium alloy was 1420Al-Li alloy, and its ingredient was 4.88%, Li2.05%, Zr 0.13%, Fe 0.12%, Si0.11%, and the margin is Al;

[0113](2) When depth purification, the aluminum lithium alloy passes into the temperature of 710 ° C at the temperature of the insulation furnace, from the temperature of 697 ° C from the outflow port C5, purifying time 30 min; when continuous casting, the casting speed is 50 mm / min, The ingot is 300mm in diameter; the maximum degassing size is 1.3mm, the inclusion area fraction is 0.08%, and the ultrasonic flaw detection is a, the hydrogen content is 0.10 ppm;

[0114]With a conventional chute argon protective continuous casting method, the aluminum lithium alloy of the same material is cast, the maximum scales of the ingot are 5.4 mm, the inclusion area fraction is 0.22%, and the ultrasonic...

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Abstract

The invention discloses a device and method for deeply purifying an aluminum-lithium alloy melt. A purification furnace in the device comprises a purification furnace crucible, a purification furnace body, an upper plate and a lower plate. An upper liquid level rod, a lower liquid level rod, a purification furnace thermocouple and a vacuum pipe are assembled on the upper plate. A holding furnace thermocouple, a holding furnace liquid level rod and a measuring pipe are assembled on the lower plate. A holding furnace comprises an upper furnace body, a holding furnace crucible and a lower furnace body. The method comprises the following steps that (1) the purification furnace crucible and the holding furnace furnace crucible are heated; (2) the upper liquid level rod, the lower liquid level rod and the holding furnace liquid level rod respectively form a liquid level measuring circuit; (3) the aluminum-lithium alloy melt is introduced into the holding furnace crucible; (4) vacuumizing is carried out to enable the aluminum-lithium alloy melt to enter the purification furnace crucible; (5) argon is introduced, and the argon is mixed with the aluminum-lithium alloy melt for dehydrogenation; (6) the liquid level of the aluminum-lithium alloy melt is controlled; (7) the aluminum-lithium alloy melt in the holding furnace crucible enters the purification furnace crucible to form circulating purification; and (8) when the hydrogen content is less than or equal to 0.10 ppm, deep purification is finished. According to the device and method, the hydrogen content of an aluminum-lithium alloy can be reduced by 20 times or above.

Description

Technical field[0001]The present invention belongs to the field of material processing molding, and more particularly to devices and methods of aluminum lithium alloy melt purification.Background technique[0002]The aluminum lithium alloy is a large number of applications in the aerospace, aerospace domains due to high ratios and high ratings. The key technique prepared by aluminum lithium alloy is the molten casting of alloy; due to the high activity of liquid aluminum lithium alloys, it is easily reacted with water vapor in the air, and the oxygen clamp is formed, and hydrogen is sued into the melt; liquid aluminum lithium alloy The surface formed of the surface, loose, and the air is immersed from its micropores and cracks, accelerate oxidation, exacerbated hydrogen, so purification of aluminum lithium-alloy fluids is the basis for preparing high-quality aluminum lithium alloy.[0003]Since the liquid aluminum lithium alloy is dissolved in the existing industrially applied refractor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/04C22B9/02C22B9/05C22C1/02B22D11/117B22D11/119
CPCB22D11/001B22D11/117B22D11/119C22B9/023C22B9/04C22B9/055C22C1/02Y02P10/20
Inventor 崔建忠王向杰王复越
Owner NORTHEASTERN UNIV
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