Refining flux for magnesium-lithium alloy and preparation method thereof

A technology of magnesium-lithium alloy and flux, which is applied in the field of metal materials and metallurgy to achieve the effects of convenient slag removal, reduction of harmful gas emissions, and improvement of removal rate

Active Publication Date: 2021-07-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the existing magnesium-lithium alloy refining flux, and propose a magnesium-lithium alloy refining flux that does not react with lithium elements and has adsorption during use and a preparation method thereof; during use, The adsorbent in the refining agent is heated and decomposed to continuously release tiny inert gas bubbles. During the process of floating up, the bubbles will absorb non-metallic inclusions and make them agglomerate into large particles, greatly improving the removal rate of various inclusions, and the refining effect is stable. , and easy to separate from the alloy liquid to facilitate slag removal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a kind of refining flux for magnesium lithium alloy, and its chemical composition mass percent is: 30% potassium chloride (KCl), 20% potassium fluoride (KF), 30% potassium bromide (KBr), 12 % lithium chloride (LiCl), 5% lithium fluoride (LiF), 1.5% lithium carbonate (Li 2 CO 3 ), 1.5% Potassium Carbonate (K 2 CO 3 ).

[0037] After weighing the raw materials according to the mass percentage of the above-mentioned raw materials, preheat the crucible, add lithium chloride, potassium fluoride, potassium bromide, lithium fluoride and potassium chloride; heat up to 700 ° C to melt them all, stir evenly, Cast into blocks; crush and grind the block samples to obtain powder samples, pass through a No. 20 sieve, add lithium carbonate and potassium carbonate and mix them by ball milling to obtain a refining flux, which is stored in a closed container for use.

[0038] Before use, prepare a refining flux of about 6% of the mass of the melt. When used as...

Embodiment 2

[0041] The present embodiment provides a kind of refining flux for magnesium-lithium alloy, its chemical composition mass percent is: 35% potassium chloride (KCl), 23% potassium fluoride (KF), 30% potassium bromide (KBr), 5% % lithium chloride (LiCl), 5% lithium fluoride (LiF), 2% lithium carbonate (Li 2 CO 3 ).

[0042] After weighing the raw materials according to the mass percentage of the above-mentioned raw materials, preheat the crucible, add potassium bromide, lithium chloride, potassium fluoride, lithium fluoride and potassium chloride; heat up to 700°C to melt them all, stir evenly, Cast into blocks; crush and grind the block samples to obtain powder samples, add lithium carbonate after passing through a No. 30 sieve and perform ball milling and mixing to obtain a refining flux, which is placed in an airtight container for later use.

[0043] Before use, prepare a refining flux of about 7% of the mass of the melt. When used as a covering agent, add commercially pur...

Embodiment 3

[0046] The present embodiment provides a kind of refining flux for magnesium lithium alloy, and its chemical composition mass percent is: 30% potassium chloride (KCl), 19% potassium fluoride (KF), 30% potassium bromide (KBr), 15% % lithium chloride (LiCl), 5% lithium fluoride (LiF), 1% lithium carbonate (Li 2 CO 3 ).

[0047] After weighing the raw materials according to the mass percentage of the above-mentioned raw materials, preheat the crucible, add potassium bromide, lithium chloride, potassium fluoride, lithium fluoride and potassium chloride; heat up to 730°C to melt them all, stir evenly, Cast into blocks; crush and grind the block samples to obtain powder samples, pass through a No. 40 sieve, add lithium carbonate and perform ball milling to obtain a refining flux, which is placed in a closed container for later use.

[0048] Before use, prepare a refining flux of about 9% of the mass of the melt. When used as a covering agent, add commercially pure magnesium or ma...

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Abstract

The invention provides a refining flux for a magnesium-lithium alloy and a preparation method thereof. The flux is prepared from, by mass, 20-50% of potassium chloride (KCl), 15-40% of potassium fluoride (KF), 20-40% of potassium bromide (KBr), 5-15% of lithium chloride (LiCl), 5-10% of lithium fluoride (LiF) and 1-3% of a carbonate foaming agent. The carbonate foaming agent comprises one or more of lithium carbonate and potassium carbonate. According to the flux, the proportion of all the components is optimized, the flux has the good melting point, viscosity and wettability, meanwhile, in the using process, the foaming agent is heated to generate inert gases, the part of the impurities can be brought out to the surface of melt in the bubble floating process, so that the dosage of the flux is reduced, the flux is not prone to being mixed into alloy liquid, separation from the melt is facilitated, and the ingot casting quality is guaranteed.

Description

technical field [0001] The invention relates to a refining flux for magnesium-lithium alloy and its preparation method, especially a magnesium-lithium alloy refining flux with good spreadability and fluidity and the effect of promoting inclusion agglomeration, which is used for purifying magnesium-lithium alloy melt The invention is inert to magnesium-lithium alloy and belongs to the field of metal materials and metallurgy. Background technique [0002] The demand for ultra-light and high-strength structural materials in modern industry is becoming more and more obvious. Due to the significant advantages of magnesium-lithium alloys, scientists have paid close attention to them. As the lightest metal structural material so far, the application density of magnesium-lithium alloys in the industry is only equivalent to 1 / 2 to 2 / 3 of the density of magnesium alloys. Magnesium-lithium alloy also has a series of advantages such as high elastic modulus, high compressive yield stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C23/00C22C1/02
CPCC22C1/06C22C23/00C22C1/02
Inventor 刘文才徐仕豪吴国华温璐丁文江
Owner SHANGHAI JIAO TONG UNIV
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