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Refining method for wrought aluminum-lithium alloy with low lithium content

A technology for deforming aluminum and lithium alloys, applied in the field of aluminum alloy refining, can solve the problems of slag removal, increase of smelting cost, and high burning loss rate of Li element, and achieve reduction of hydrogen content and slag content, reduction of smelting cost, and high mechanical properties Improved effect

Active Publication Date: 2019-01-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the aluminum alloy he refined does not contain Li elements, this method cannot effectively degas and remove slag from deformed aluminum-lithium alloys with low lithium content, and will cause a high burning loss rate of Li elements, which improves the melting process. At the same time, the refining agent he uses contains hexachloroethane and other components, which will release toxic gas during the refining process, which will have an adverse impact on the safety and health of the staff

Method used

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  • Refining method for wrought aluminum-lithium alloy with low lithium content
  • Refining method for wrought aluminum-lithium alloy with low lithium content
  • Refining method for wrought aluminum-lithium alloy with low lithium content

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Embodiment 1

[0034] This embodiment provides a refining method for a deformed aluminum-lithium alloy with low lithium content, the flow process is as follows Figure 9 shown, including the following steps:

[0035] According to the composition and weight percentage of Li 0.5%, Cu 2.0%, Zn 0.2%, Ag 0.1%, Zr 0.02% alloy, first preheat the pure aluminum and the required master alloy to 180 ℃ ~ 200 ℃, and then put Pure aluminum is melted in a graphite crucible. After the aluminum ingot is melted, when the temperature is 810°C, add an environmentally friendly refining agent (KCl 30-35%, NaCl 40-45%, Mg 2 N 3 8~16%, CaF 2 5~10%,Na 3 AlF 6 10-15%, rare earth 0.2%-0.5%) for primary refining, and the amount of refining agent used is 0.5% of the total weight of the melt. Between 780°C and 750°C, Zr, Cu, Zn, Ag are added sequentially. When the temperature is 730°C, use argon rotary injection equipment for secondary refining. The nozzle speed is 250r / min, the gas flow rate is 10L / min, and the...

Embodiment 2

[0043] This embodiment provides a refining method for a deformed aluminum-lithium alloy with low lithium content, the flow process is as follows Figure 9 shown, including the following steps:

[0044] According to the composition and weight percentage of Li 1.0%, Cu 3.0%, Zn 1.0%, Mg 0.5%, Sc 0.10% alloy, first preheat the pure aluminum and the required master alloy to 180 ℃ ~ 200 ℃, and then put Pure aluminum is melted in a graphite crucible. After the aluminum ingot is melted, when the temperature is 810°C, an environmentally friendly refining agent is added for primary refining, and the amount of refining agent used is 0.6% of the total weight of the melt. Add Sc, Cu, Zn, Mg in sequence between 780°C and 750°C. When the temperature is 730°C, use argon rotary blowing equipment for secondary refining. The nozzle speed is 300r / min, the gas flow rate is 15L / min, and the blowing time is 15min. Li element is added after the secondary refining. When the temperature is 720°C, a...

Embodiment 3

[0052] This embodiment provides a refining method for a deformed aluminum-lithium alloy with low lithium content, the flow process is as follows Figure 9 shown, including the following steps:

[0053] According to the composition and weight percentage of Li 1.5%, Cu 4.0%, Zn 1.5%, Mn 0.7%, Zr 0.2% alloy, first preheat the pure aluminum and the required master alloy to 180 ℃ ~ 200 ℃, and then put Pure aluminum is melted in a graphite crucible. After the aluminum ingot is melted, when the temperature is 810°C, an environmentally friendly refining agent is added for primary refining, and the amount of refining agent used is 0.7% of the total weight of the melt. Between 780°C and 750°C, Zr, Cu, Zn, and Mn are added in sequence. When the temperature is 730°C, use argon rotary blowing equipment for secondary refining. The nozzle speed is 350r / min, the gas flow rate is 20L / min, and the blowing time is 20min. Li element is added after the secondary refining. When the temperature i...

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Abstract

The invention provides a refining method for a wrought aluminum-lithium alloy with low lithium content. The method comprises the following steps that S1, after pure aluminum is molten, an environment-friendly refining agent is added, primary refining is carried out, and then main alloying elements 1, refining alloy elements and microalloying elements are added; S2, after treatment is carried out in the step S1, rotary injection is carried out by using argon, and secondary refining is carried out; and S3, after treatment is carried out in the step S2, a main alloying element 2 is added, then rotary injection by using the argon and the environment-friendly refining agent are used in a combined mode, and tertiary refining is carried out. Compared with the prior art, the method has the following beneficial effects that the hydrogen content and the slag content of the obtained wrought aluminum-lithium alloy with low lithium content are greatly decreased, the burn out rate of Li is decreased, the smelting cost is lowered, the mechanical property is improved, and technical support is provided for development and practical application of the wrought aluminum-lithium alloy with low lithiumcontent.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy refining, and relates to a refining method for deformed aluminum-lithium alloy with low lithium content, in particular to a three-stage combined refining process for deformed aluminum-lithium alloy with low lithium content. The use of this refining process greatly reduces the gas content and slag content of the aluminum-lithium alloy melt, reduces the burning loss rate of the Li element, and the obtained alloy has excellent performance. The new environmentally friendly refining agent used is safe and environmentally friendly, thus providing low lithium content Provide technical support for the development and practical application of deformed aluminum-lithium alloys. Background technique [0002] Aluminum-lithium alloy material is an advanced lightweight structural material. It has developed rapidly in aerospace materials in recent years. It has low density, high specific strength and speci...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C21/18
CPCC22C1/06C22C21/18
Inventor 荣冕张亮吴国华刘文才孙江伟
Owner SHANGHAI JIAO TONG UNIV