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Device and method for deep purification of aluminum-lithium alloy melt

An aluminum-lithium alloy, deep purification technology, applied in the direction of improving process efficiency, can solve problems such as large consumption of argon gas, low purification efficiency, inability to guarantee the metallurgical quality of ingots, etc., and achieve the reduction of maximum inclusion size and oxide content. The effect of reducing and good flaw detection results

Active Publication Date: 2021-11-30
NORTHEASTERN UNIV LIAONING
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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 deep purification of aluminum-lithium alloy melt
  • Device and method for deep purification of aluminum-lithium alloy melt
  • Device and method for deep purification of aluminum-lithium alloy melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The structure of the device for deep purification of aluminum-lithium alloy melt is as follows: figure 1 As shown, it consists of purification furnace A, holding furnace gasket B and holding furnace C;

[0074] The structure of purification furnace A is as follows figure 2 As shown, the top view is as image 3 As shown, the A-A direction structure is as follows Figure 4 As shown, it includes the purification furnace crucible A11, the purification furnace body A10, the upper plate A27 and the lower plate A31; the purification furnace body A10 is set outside the side wall of the purification furnace crucible A11, and the top of the purification furnace crucible A11 is sealed and connected with the upper plate A27 , the bottom plate of the purification furnace crucible A11 is provided with a guide tube A1 and a drain tube A33 to connect the bottom plate of the purification furnace crucible A11 up and down, and the guide tube A1 and the discharge tube A33 pass through t...

Embodiment 2

[0103] The structure of the device for the deep purification of the aluminum-lithium alloy melt is the same as in Example 1;

[0104] Method is with embodiment 1, and difference is:

[0105] (1) The processed aluminum-lithium alloy is 2195Al-Li alloy, and its composition is Cu 4.2%, Mg0.43%, Li 1.28%, Zr 0.13%, Ag 0.38%, Fe 0.09%, Si0.04% by mass percentage , the balance is Al;

[0106] (2) When performing deep purification, the temperature when the aluminum-lithium alloy is passed into the holding furnace crucible C3 is 712°C, the temperature released from the outlet C5 is 702°C, and the purification time is 20min; when performing continuous casting, the casting speed is 70mm / min, The ingot diameter is 200mm; the maximum slag inclusion size is 0.9mm, the inclusion area fraction is 0.03%, the ultrasonic flaw detection result is A, and the hydrogen content is 0.08ppm;

[0107] Using the traditional argon-protected continuous casting method in the chute, the aluminum-lithium a...

Embodiment 3

[0110] The structure of the device for the deep purification of the aluminum-lithium alloy melt is the same as in Example 1;

[0111] Method is with embodiment 1, and difference is:

[0112] (1) The processed aluminum-lithium alloy is 1420Al-Li alloy, and its composition is Mg 4.88%, Li2.05%, Zr 0.13%, Fe 0.12%, Si0.11%, and the balance is Al by mass percentage;

[0113] (2) When performing deep purification, the temperature when the aluminum-lithium alloy is passed into the holding furnace crucible C3 is 710°C, the temperature released from the outlet C5 is 697°C, and the purification time is 30min; when performing continuous casting, the casting speed is 50mm / min, The ingot diameter is 300mm; the maximum slag inclusion size is 1.3mm, the inclusion area fraction is 0.08%, the ultrasonic flaw detection result is A, and the hydrogen content is 0.10ppm;

[0114] Using the traditional argon-protected continuous casting method in the chute, the aluminum-lithium alloy of the same ...

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Abstract

A device and method for deep purification of an aluminum-lithium alloy melt. The purification furnace in the device includes a purification furnace crucible, a purification furnace body, an upper and a lower plate; the upper plate is equipped with upper and lower liquid level rods, and a purification furnace thermocouple and vacuum tube; the lower plate is equipped with holding furnace thermocouple, holding furnace liquid level rod and measuring tube; holding furnace includes upper furnace body, holding furnace crucible and lower furnace body; the method is: (1) purification furnace crucible and holding furnace crucible Heating; (2) The upper and lower liquid level rods and the holding furnace liquid level rod respectively constitute a liquid level measurement circuit; (3) The aluminum-lithium alloy melt passes into the holding furnace crucible; (4) Vacuumizes the aluminum-lithium alloy melt into the Purification furnace crucible; (5) pass argon into the aluminum-lithium alloy melt for dehydrogenation; (6) control the liquid level of the aluminum-lithium alloy melt; (7) the aluminum-lithium alloy melt in the holding furnace crucible enters the purification furnace crucible to form Circular purification; (8) When the hydrogen content is less than or equal to 0.10ppm, the deep purification is completed. The device and method of the invention can reduce the hydrogen content of the aluminum-lithium alloy by more than 20 times.

Description

technical field [0001] The invention belongs to the technical field of material processing, molding and manufacturing, and in particular relates to a device and method for deep purification of an aluminum-lithium alloy melt. Background technique [0002] Due to its high specific strength and high specific stiffness, aluminum-lithium alloys are widely used in aircrafts in aerospace and aviation fields. The key technology for the preparation of aluminum-lithium alloys is alloy melting and casting; due to the high activity of liquid aluminum-lithium alloys, it is very easy to react with water vapor in the air, react with oxygen to form oxide slag, and hydrogen is absorbed into the melt; liquid aluminum-lithium alloys The oxide formed on the surface is loose and brittle, and the air infiltrates from its micropores and cracks, which accelerates the oxidation and intensifies the hydrogen absorption. Therefore, the purification of the aluminum-lithium alloy liquid is the basis for ...

Claims

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Application Information

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Patent Type & Authority Patents(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 LIAONING
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