Refining agent for magnesium alloy with high rare earth content, preparation method and application method

A technology with high rare earth content and application method is applied in the fields of refining agent, preparation and application of magnesium alloys with high rare earth content, which can solve the problems of affecting the purification efficiency of flux, limited scope of action, inclusion of flux, etc., and achieves improved spreadability and spreadability Good, strong slag-making ability

Pending Publication Date: 2022-03-15
SHANGHAI SPACE PRECISION MACHINERY RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the added Zr compound itself is easy to become a flux inclusion, which affects the flux purification efficiency
Chinese patent CN108856681A applies electromagnetic treatment to the melt after refining, and refines the grains in the form of external field assistance. The effect of grain refinement is obvious, but the magnetic field decays seriously in the high-temperature melt, and the scope of action is limited.

Method used

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  • Refining agent for magnesium alloy with high rare earth content, preparation method and application method
  • Refining agent for magnesium alloy with high rare earth content, preparation method and application method

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preparation example Construction

[0043] According to a second aspect of the present invention, a method for preparing a refining agent for magnesium alloys with high rare earth content is provided, comprising the steps of:

[0044] S1, the CaCl 2 , NaCl and KCl are dried and dehydrated at 200-230°C, and stored in a dry airtight container for later use;

[0045] S2, heat up the crucible to 200-250°C and add CaCl weighed according to the design mass fraction and mixed uniformly 2 , NaCl and KCl, heat the crucible to 720-790°C, stir for 5-20 minutes after the flux is completely melted, pour into the mold, solidify and cool into blocks;

[0046] In this step, the material of the crucible can be graphite crucible, corundum crucible, or iron crucible, as long as it can withstand the corresponding high temperature and will not react with molten salt, any crucible material can be used.

[0047] In this step, the stirring method should be mechanical stirring, and the material of the stirring rod can be the same as t...

Embodiment 1

[0062] A refining agent for magnesium alloys with high rare earth content, its components and mass fractions are: KCl: 44%; CaCl 2 : 26%; BaCl 2 : 18%; NaCl: 8%; CaF 2 : 1%; Ti / Zr powder (ratio 0.2:0.8): 1%; K 2 TiF 6 / K 2 ZrF 6 (The ratio is 0.18:0.82): 2%.

[0063] The preparation method of the refining agent for magnesium alloy with high rare earth content of the present invention comprises the following steps: adding CaCl 2 , NaCl and KCl were dried and dehydrated at 210°C, and stored in a dry airtight container for later use; after the crucible was heated to 250°C, CaCl, which was weighed according to the designed mass fraction and mixed evenly, was added 2 , NaCl and KCl, 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 block flux, and mix with BaCl 2 , CaF 2 , Ti / Zr powder, K 2 TiF 6 / K 2 ZrF 6 The salt is mixed and put into a ball mill for grinding, sieved after...

Embodiment 2

[0066] A refining agent for magnesium alloys with high rare earth content, its components and mass fractions are: KCl: 39%; CaCl 2 : 30%; BaCl 2 : 17%; NaCl: 5%; CaF 2 : 2%; Ti / Zr powder (ratio 0.1:0.9): 2%; K 2 TiF 6 / K 2 ZrF 6 (The ratio is 0.15:0.85): 5%.

[0067] The preparation method of the refining agent for magnesium alloy with high rare earth content of the present invention comprises the following steps: adding CaCl 2 , NaCl and KCl were dried and dehydrated at 220°C, and stored in a dry airtight container for later use; after the crucible was heated to 250°C, CaCl, which was weighed according to the designed mass fraction and mixed evenly, was added 2 , NaCl and KCl, heat the crucible to 760°C, stir for 10 minutes after the flux is completely melted, pour it into a mold, solidify and cool it into blocks; break the block flux, and mix with BaCl 2 , CaF 2 , Ti / Zr powder, K 2 TiF 6 / K 2 ZrF 6 The salt is mixed and put into a ball mill for grinding, sieved a...

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Abstract

The invention provides a refining agent for magnesium alloy with high rare earth content, a preparation method and an application method. The refining agent comprises the following components in percentage by mass: 15-40% of CaCl2; 13% to 25% of BaCl2; 0 to 10 percent of NaCl; 1 to 10 percent of CaF2; 0-6% of Ti/Zr powder; 0 to 10 percent of K2TiF6/K2ZrF6; kCl: the balance; wherein the Ti/Zr powder is a composition of Ti powder and Zr powder which are mixed in any proportion; the K2TiF6/K2ZrF6 is a composition of the K2TiF6 and the K2ZrF6 which are mixed according to any proportion. In the purification process of the magnesium-rare earth alloy with the high rare earth content, a refining agent settles slowly and needs to stand for a long time, so that refinement decline is caused, and the production efficiency is low. By designing the proportion of the refining agent and then adding Ti/Zr powder or Ti/Zr salt as an assistant, the inclusion capturing capacity of the refining agent is improved, the separation capacity of the refining agent and the melt is improved, the flux density is increased, the settling rate of the refining agent is increased, and the melt purification time is shortened. And current treatment is carried out in the refining process, separation of inclusions and the melt is further promoted, the melt purification effect is enhanced, and the purification efficiency of the refining agent is improved.

Description

technical field [0001] The invention belongs to the field of metal materials and metallurgy, and particularly relates to a refining agent for magnesium alloys with high rare earth content, a preparation method and an application method, aiming at slow settling of the refining agent in magnesium alloys with high rare earth content, and the need to prolong the standing time to avoid flux inclusions, However, the application problem that will lead to grain coarsening has been developed. This refining agent is used to remove impurity elements and inclusions from magnesium alloy melts with high rare earth content. It can effectively shorten the refining and standing time while improving the purity of the melt. Background technique [0002] Magnesium and magnesium alloys have significant advantages such as low density, high specific strength and specific stiffness, and low raw material prices, and have received more and more attention. They have broad application prospects in the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/03C22B9/00C22C23/06
CPCC22C1/06C22C1/03C22B9/003C22C23/06
Inventor 庞松龚政轩季松候正全肖旅陈舸周海涛
Owner SHANGHAI SPACE PRECISION MACHINERY RES INST
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