Bromine-containing refining agent for rapid sedimentation of rare earth magnesium alloy, preparation method and application

A rare earth intermediate alloy and rare earth magnesium technology, applied in the field of metal materials and metallurgy, can solve the problems of poor specific gravity of magnesium alloy melt, slow refining agent sedimentation, shortening refining process, etc. Good results

Active Publication Date: 2022-03-25
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to overcome above-mentioned defect, provide a kind of bromine-containing refining agent for rapid sedimentation rare earth magnesium alloy, the component of refining agent of the present invention comprises CaCl 2, BaCl2, NaCl, CaF2, BaBr2, bromide and KCl; the refining agent of the present invention is aimed at rare earth magnesium The problems of slow settling, poor separation, and long standing time of the refining agent in the alloy increase the content of the specific gravity agent and increase the density of the refining agent. Adding part of bromine salt as a flux improves the spreadability and slagging ability of the refining agent. The refining ability has been improved. During the refining process, it has good wetting, adsorption, and capture capabilities for inclusions in the alloy, and has a large specific gravity difference with the magnesium alloy melt, and can be quickly separated from the magnesium alloy melt. On the basis of not affecting the grain refinement effect, the effective removal of inclusions in the magnesium alloy melt can be realized, and at the same time, the loss of rare earth atoms and Zr particles in the standing process can be reduced, and the magnesium alloy can be realized in a short standing time after refining. The full removal of inclusions in the alloy melt will neither produce flux inclusions nor affect the effect of grain refinement, effectively shorten the refining process, and is especially suitable for the refining treatment of rare earth content magnesium alloys with high melt viscosity and high density

Method used

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  • Bromine-containing refining agent for rapid sedimentation of rare earth magnesium alloy, preparation method and application
  • Bromine-containing refining agent for rapid sedimentation of rare earth magnesium alloy, preparation method and application
  • Bromine-containing refining agent for rapid sedimentation of rare earth magnesium alloy, preparation method and application

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preparation example Construction

[0044] The above-mentioned preparation method of a bromine-containing refining agent for rapid sedimentation rare earth magnesium alloy comprises the following steps:

[0045] S1, drying and dehydrating the above-mentioned raw materials at 200°C-230°C, and storing them in a dry airtight container for later use; in this step, the dry airtight container can be a drying dish, a sealed bag with moisture-proof function, or sealed in a vacuum bag for pumping. to vacuum.

[0046] S2, heat up the crucible to 250°C and add CaCl mixed uniformly according to the designed ratio 2 , NaCl and KCl, after heating up to partial melting, add BaCl mixed uniformly according to the designed ratio 2 、BaBr 2 and bromide, heat the crucible to 720-790°C, stir for 1-20 minutes after the mixed salt is completely melted, pour it into a mold, solidify and cool it into a block; in this step, the material of the crucible can be graphite crucible, corundum crucible, or It is an iron crucible, as long as i...

Embodiment 1

[0054] A bromine-containing refining agent for rapid settling rare earth magnesium alloys, its components and mass fractions are: KCl: 33%, CaCl 2 : 30%; BaCl 2 : 10%; NaCl: 5%; CaF 2 : 2%; BaBr 2 : 5%; KBr: 10%; CaBr 2 : 5%.

[0055] The preparation method of the bromine-containing refining agent for rapid settling rare earth magnesium alloys of the present invention is as follows: drying and dehydrating the above-mentioned raw materials at 210°C respectively, and storing them in a dry airtight container for later use; heating the crucible to 250°C, adding the Good and well mixed CaCl 2 , NaCl and KCl, after heating up to partial melting, add BaCl mixed uniformly according to the designed ratio 2 、BaBr 2 and KBr, heat the crucible to 750°C, stir for 5 minutes after the flux is completely melted, pour it into a mold, solidify and cool into blocks; break the obtained block flux, and mix with CaF 2 Mix and grind in a ball mill, sieve after grinding, and put into a dry air...

Embodiment 2

[0058] A bromine-containing refining agent for rapid settling rare earth magnesium alloys, its components and mass fractions are: KCl: 36%, CaCl 2 : 25%; BaCl 2 : 13%; NaCl: 0.5%; CaF 2 : 1%; BaBr 2 : 8%; NaBr: 4.5%; CaBr 2 : 12%.

[0059] The preparation method of the bromine-containing refining agent for rapid sedimentation rare earth magnesium alloy of the present invention is as follows: drying and dehydrating the above-mentioned raw materials at 220°C respectively, and storing them in a dry airtight container for later use; heating the crucible to 250°C, adding Good, well mixed CaCl 2 , NaCl and KCl, after heating up to partial melting, add BaCl mixed uniformly according to the designed ratio 2 、BaBr 2 , NaBr and KBr, heat the crucible to 760°C, stir for 10 minutes after the flux is completely melted, pour it into a mold, solidify and cool into blocks; break the block flux, and mix with CaF 2 Mix and grind in a ball mill, sieve after grinding, and put into a dry ai...

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Abstract

The invention discloses a bromine-containing refining agent for rapid sedimentation of a rare earth magnesium alloy. The bromine-containing refining agent comprises the following components: CaCl2, BaCl2, NaCl, CaF2, BaBr2, bromide and KCl. According to the refining agent, the content of a specific gravity agent is increased, the density of a flux is improved, part of bromine salt is added to serve as a fluxing agent, the spreadability, slagging capacity and refining capacity of the refining agent are improved, inclusions in magnesium melt can be fully removed within the short standing time after refining, flux inclusions are not generated, the grain refining effect is not affected, and the refining effect is good. And the refining process is effectively shortened, and the method is particularly suitable for refining treatment of the magnesium alloy with the rare earth content and high melt viscosity and density. The invention further discloses a preparation method and application of the bromine-containing refining agent.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, and in particular relates to a bromine-containing refining agent for a rapid sedimentation rare earth magnesium alloy, a preparation method and an application. Background technique [0002] As the lightest metal structural materials, magnesium and magnesium alloys have the advantages of low density, high specific strength and rigidity, good damping performance, and strong electromagnetic shielding ability, and have great potential for lightweight. They are used in aerospace, military industry, automobiles, 3C products and other fields with broadly application foreground. [0003] In recent years, with the development of aerospace, national defense and military industries, non-main load-bearing structural parts have put forward higher requirements on the room temperature and high temperature strength and toughness of materials, and the performance of traditional magnesium al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/03C22C23/06
CPCC22C1/06C22C1/03C22C23/06Y02P10/20
Inventor 龚政轩庞松季松候正全肖旅陈舸董喜旺
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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