Low-sodium aluminium-lithium intermediate alloy material and its preparation method

A master alloy, sodium-aluminum technology, applied in the field of low-sodium-aluminum-lithium master alloy materials and its preparation, can solve the problems of enhanced chemical activity, reduced density, and aggravated hydrogen absorption tendency of the alloy

Active Publication Date: 2012-06-13
HEBEI SITONG NEW METAL MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Adding lithium to aluminum alloy will reduce its density
But at the same time, it is easy to bring in more hydrogen and alkali metal ions such as sodium and potassium. Usually, in aluminum-lithium alloys, due to the addition of lithium elements, the chemical activity of the alloy during the melting process is greatly enhanced, and the tendency of the alloy to absorb hydrogen is aggravated.

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0042] In the preparation process of the present invention, aluminum, potassium, and sodium are smelted under the protection of the covering agent, and pure lithium is added after refining to remove hydrogen for alloying. The smelting operation process does not require inert gas or vacuum protection, and the process is simple. After removal of potassium and sodium by boron trioxide slagging, the content of sodium and potassium impurities in the aluminum-lithium master alloy is less, and the mass fractions thereof are respectively sodium≤0.0001% and potassium≤0.00005%. The process method has high yield and low loss of raw materials, and can quantitatively prepare aluminum-lithium master alloys with any lithium content.

[0043] In the present invention, a tensile testing machine is used to measure the elongation of the prepared low-sodium aluminum-lithium master alloy.

Embodiment 1

[0045] The preparation of low-sodium aluminum-lithium master alloy ingot by casting comprises the following steps:

[0046] Step 1: Weigh each element according to the nominal composition. In the present invention, the nominal composition of the prepared low-sodium aluminum-lithium master alloy includes 10% lithium (Li), 0.0001% sodium (Na), and 0.00005% potassium (K) and the balance of aluminum (Al);

[0047] The mass percentage purity of aluminum is 99.8%, the mass percentage purity of lithium is 99.9%, the mass percentage purity of potassium is 99.9%, and the mass percentage purity of sodium is 99.9%.

[0048] Step 2: Wrap the lithium ingot with aluminum foil to form a lithium-treated sample;

[0049]In the present invention, the size of the lithium ingot is determined according to the chamber of the melting furnace.

[0050] Step 3: preparing a covering agent, the covering agent is composed of lithium chloride and lithium fluoride, 100 parts by weight of the covering age...

Embodiment 2

[0063] Rolling low-sodium aluminum-lithium master alloy wire comprises the following steps:

[0064] Step 1: Weigh each element according to the nominal composition. In the present invention, the nominal composition of the prepared low-sodium aluminum-lithium master alloy includes 25.0% lithium (Li), 0.00005% sodium (Na), and 0.00005% potassium (K) and the balance of aluminum (Al);

[0065] The mass percentage purity of aluminum is 99.8%, the mass percentage purity of lithium is 99.9%, the mass percentage purity of potassium is 99.9%, and the mass percentage purity of sodium is 99.9%.

[0066] Step 2: Wrap the lithium ingot with aluminum foil to form a lithium-treated sample;

[0067] In the present invention, the size of the lithium ingot is determined according to the chamber of the melting furnace.

[0068] Step 3: preparing a covering agent, the covering agent is composed of lithium chloride and lithium fluoride, 100 parts by weight of the covering agent contains 90 part...

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Abstract

The invention discloses a low-sodium aluminium-lithium intermediate alloy material and its preparation method. The low-sodium aluminium-lithium intermediate alloy material contains, by weight, 8.0-25.0% of Li, less than or equal to 0.0001% of Na, less than or equal to 0.00005% of K and the balance Al. According to the preparation method, a mixed salt of pure lithium chloride and lithium fluoride is used as a covering agent; boron trioxide is used to remove sodium and potassium; and high-pure nitrogen or argon is used for gas refining. The melting operation process requires no inert gas or vacuum protection. The technology is simple. After the sodium removal technological process, the contents of sodium and potassium impurity in the alloy are low, wherein the mass fraction of sodium is less than or equal to 0.0001% and the mass fraction of potassium is less than or equal to 0.00005%. The technological method has advantages of high yield and little loss of raw materials, and can be adopted for quantitative preparation of the aluminium-lithium intermediate alloy with any lithium content.

Description

technical field [0001] The invention relates to an aluminum-lithium master alloy material, in particular to a low-sodium aluminum-lithium master alloy material and a preparation method thereof. Background technique [0002] Lithium is the lightest metal element in nature, with a density of 0.534g / cm. Adding 1% (mass fraction) of lithium to pure aluminum can reduce the density of aluminum-lithium alloy by 3%, and increase the elastic modulus by about 6%. Using it instead of conventional aluminum alloys can reduce the weight of components by 10% to 15%. , Rigidity increased by 15% to 20%. Therefore, as an ideal structural material with low density, high elastic modulus, high strength and high specific stiffness, aluminum-lithium alloy is widely used in aerospace and defense space and other fields. [0003] Due to its low density, high modulus of elasticity, and the advantages of weldability, corrosion resistance, high strength, and crack resistance, aluminum-lithium alloys h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/03
Inventor 周铁涛
Owner HEBEI SITONG NEW METAL MATERIAL CO LTD
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