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Process for preparing LZ91 magnesium-lithium alloy cast ingot in antivacuum state

A magnesium-lithium alloy and preparation technology, applied in the field of magnesium alloy processing, can solve the problems of difficult promotion, high chemical activity, high price of LZ91 magnesium-lithium alloy ingots, etc., to reduce production costs, improve production efficiency, Guaranteed quality effect

Pending Publication Date: 2017-11-21
洛阳晟雅镁合金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the disadvantage of Mg-Li alloy is that it has high chemical activity, Li can easily combine with oxygen, nitrogen, and hydrogen in the air to form highly stable compounds, so melting and casting must be carried out in vacuum or inert atmosphere, using common flux It is difficult to obtain high-quality ingots by means of protection. At present, LZ91 magnesium-lithium alloy ingots are generally smelted in a vacuum environment. This method requires high purity of materials such as pure magnesium lithium and battery-grade pure lithium. Accuracy also requires strict
Therefore, this has just caused the price of the LZ91 magnesium-lithium alloy ingot to be finally produced to remain high, and it is difficult to promote this kind of magnesium alloy in the market.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The composition weight percentage of each component in the raw material is: magnesium ingot 88.5-90%, lithium ingot 8-10%, zinc ingot 0.5-1.5%, manganese ≤ 0.1%, silicon ≤ 0.005%, iron ≤ 0.1%, sodium ≤ 0.005%, potassium ≤ 0.005%, the sum of the above components by weight is 100%;

[0022] Magnesium ingots use high-purity magnesium ingots with a purity of more than 99.9%, lithium ingots use high-purity lithium ingots with a purity of more than 99.9%, and zinc ingots use high-purity zinc ingots with a purity of more than 99.9%;

[0023] The composition weight percentage of each component in No. 1 flux is: anhydrous magnesium chloride 80%, barium chloride 12%, calcium fluoride 8%, the sum of the above components by weight is 100%;

[0024] The ratio of No. 1 flux to raw materials is 1:100;

[0025] The composition weight percentage of each component in No. 2 flux is: anhydrous magnesium chloride 60%, barium chloride 15%, magnesium fluoride 15%, calcium fluoride 10%, the s...

Embodiment 2

[0029] The first step, smelting: when the temperature of the crucible in the melting furnace rises to 180-200°C, add No. 1 flux into the crucible, and add magnesium ingots and zinc ingots after the No. 1 flux melts. A layer of oil film is formed on the surface of the liquid to isolate the alloy liquid from the air, so as to prevent the magnesium alloy from burning due to oxidation and burning, and it can also play a role in extinguishing fire. After the magnesium ingot and zinc ingot are melted, the temperature of the crucible rises to 720~730°C , the mixed gas of argon and SF6 is blown into the opening of the crucible through the conduit to isolate the air. After the temperature of the alloy liquid in the crucible drops to 650-660 ° C, put the lithium ingot wrapped in aluminum foil into the iron cage and press it into the alloy liquid After the lithium ingot is melted, take out the iron cover, and when the temperature of the alloy liquid in the crucible rises to 710-730°C, sti...

Embodiment 3

[0031] The second step, an analysis test: take the alloy liquid sample in the crucible in the melting furnace for an analysis test, and the mass percentages of the various components of the alloy liquid sample should meet: magnesium 88.5-90%, lithium 8-10%, Zinc 0.5~1.5%, manganese ≤0.1%, silicon ≤0.005%, iron ≤0.1%, sodium ≤0.005%, potassium ≤0.005%, impurity ≤0.005%;

[0032] The third step, refining and secondary analysis and testing: after the alloy liquid in the crucible reaches the standard of primary analysis and testing, add No. 2 flux for refining, and after refining for 15-16 minutes, extract the alloy liquid sample again from the crucible for secondary analysis and testing , it is required that the mass percentages of the various components of the alloy liquid sample should meet: magnesium 88.5-90%, lithium 8-10%, zinc 0.5-1.5%, manganese ≤ 0.1%, silicon ≤ 0.005%, iron ≤ 0.1%, sodium ≤ 0.005%, potassium ≤0.005%, impurity ≤0.005%.

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PUM

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Abstract

The invention relates to a process for preparing an LZ91 magnesium-lithium alloy cast ingot in an antivacuum state. Raw materials are prepared from the ingredients in percentage by weight: 88.5% to 90% of magnesium ingots, 8% to 10% of lithium ingots, 0.5% to 1.5% of zinc ingots, not higher than 0.1% of manganese, not higher than 0.005% of silicon, not higher than 0.1% of ferrum, not higher than 0.005% of sodium and not higher than 0.005% of potassium, wherein the sum of weight percent of all the above ingredients is 100%; the magnesium ingots are high-purity magnesium ingots with the purity of 99.9% or more, the lithium ingots are high-purity lithium ingots with the purity of 99.9% or more, and the zinc ingots are high-purity zinc ingots with the purity of 99.9% or more. The preparation process comprises the flow steps: smelting, primary analyzing assaying, refining and secondary analyzing assaying, heat-insulating standing and casting. Production process conditions are strictly controlled, a difficult point, i.e., a fusion casting process of magnesium-lithium alloy production is overcome, the production efficiency is increased, the quality of the cast ingot is guaranteed, the production cost is reduced, and the LZ91 magnesium-lithium alloy cast ingot can be popularized and applied to the fields of medical treatment electronics, traffic industry and the like.

Description

technical field [0001] The invention relates to the field of magnesium alloy processing, in particular to a preparation process of LZ91 magnesium-lithium alloy ingot in a non-vacuum state. Background technique [0002] As we all know, LZ91 magnesium-lithium alloy has high specific strength, high ductility and high specific elastic modulus, good shock absorption performance and high-energy particle penetration resistance, and has good deformation superplasticity and easy welding performance, welding strength Up to 90% of the strength of the base metal. Therefore, LZ91 magnesium-lithium alloy is usually used in camera frames, casings, medical treatment, electronics, etc. Its weight is equivalent to that of the original plastic casing, but its stiffness is higher. It is also one of the key materials for current research in the automotive industry. Therefore, the research and development of LZ91 magnesium-lithium alloy is developing rapidly. [0003] Since the disadvantage of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02
CPCC22C1/02C22C23/00
Inventor 陈培军李志军
Owner 洛阳晟雅镁合金科技有限公司