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Magnesium alloy rare earth compound flux and its production method

A technology of rare earth compounds and magnesium alloys, applied in the field of metal materials and metallurgy, can solve the problems of low mechanical properties and corrosion resistance of magnesium alloys, inability to produce active rare earth elements, poor separation between flux and magnesium alloys, etc. Performance and anti-corrosion performance, strong activity, effect of improving refining effect

Inactive Publication Date: 2003-12-10
SHANGHAI HAOHUA MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The RJ2 flux that is generally used at present [as described in the document "Nonferrous Casting Alloys and Smelting", (Lu Shusun, etc., National Defense Industry Press, published in May 1983, P195-199)], the flux has no effect on the inclusions in the magnesium melt. The adsorption capacity of the flux is not strong enough, and the slag removal ability is poor; and because the flux is poorly separated from the magnesium alloy, the flux is easily mixed into the alloy liquid and becomes a flux inclusion.
In addition, when the flux is used for refining the magnesium alloy melt, it cannot produce active rare earth elements that are beneficial to improve the performance of the magnesium alloy, so the mechanical properties and corrosion resistance of the magnesium alloy after refining with this flux are not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Magnesium alloy rare earth compound flux composition (mass percentage): 40% magnesium chloride (MgCl 2 ), 25% potassium chloride (KCl), 12% sodium chloride (NaCl), 6% calcium chloride (CaCl 2 ), 5% calcium fluoride (CaF 2 ), 4% barium chloride (BaCl 2 ), 8% lanthanum fluoride (LaF 3 ).

[0012] The production method of the magnesium alloy rare earth compound flux is as follows: after the crucible is heated to about 350°C, magnesium chloride, potassium chloride, sodium chloride, calcium chloride and barium chloride are added, and after the temperature is raised to partial melting, calcium fluoride is added, Raise the temperature to about 770°C, stir evenly, and cast into blocks. After crushing, put it into a ball mill and grind it into powder, and sieve it with a No. 20 sieve. Lanthanum fluoride was then added and mixed with a ball mill. Prepared flux should be put into airtight container for standby.

[0013] When in use, when the magnesium alloy is smelted in th...

Embodiment 2

[0015] Magnesium alloy rare earth compound flux composition (mass percentage): 55% magnesium chloride (MgCl 2 ), 15% potassium chloride (KCl), 13% sodium chloride (NaCl), 4% calcium chloride (CaCl 2 ), 9% calcium fluoride (CaF 2 ), 1% barium chloride (BaCl 2 ), 3% cerium fluoride (CeF 3 ).

[0016] The production method of the magnesium alloy rare earth compound flux is as follows: after the crucible is heated to about 400°C, magnesium chloride, potassium chloride, sodium chloride, calcium chloride and barium chloride are added, and after the temperature is raised to partial melting, calcium fluoride is added. Raise the temperature to about 760°C, stir evenly, and cast into blocks. After crushing, put it into a ball mill and grind it into powder, and sieve it with a No. 30 sieve. Then cerium fluoride was added and mixed with a ball mill. Prepared flux should be put into airtight container for standby.

[0017] When in use, when the magnesium alloy is smelted in the resi...

Embodiment 3

[0019] Magnesium alloy rare earth compound flux composition (mass percentage): 40% magnesium chloride (MgCl 2 ), 15% potassium chloride (KCl), 23% sodium chloride (NaCl), 1% calcium chloride (CaCl 2 ), 11% calcium fluoride (CaF 2 ), 6% barium chloride (BaCl 2 ), 4% lanthanum chloride.

[0020] The production method of the magnesium alloy rare earth compound flux is as follows: after the crucible is heated to about 300°C, magnesium chloride, potassium chloride, sodium chloride, calcium chloride and barium chloride are added, and after the temperature is raised to partial melting, calcium fluoride is added. Raise the temperature to about 780°C, stir evenly, and cast into blocks. After crushing, put it into a ball mill and grind it into powder, and sieve it with a No. 40 sieve. Lanthanum chloride was then added and mixed with a ball mill. Prepared flux should be put into airtight container for standby.

[0021] When in use, when the magnesium alloy is smelted in the resista...

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Abstract

The present invention provides a magnesium alloy rare earth compound flux and its production method. Its composition includes (wt%) 40-55% of magnesium chloride, 15-25% of potassium chloride, 12-25% of sodium chloride, 1-6% of calcium chloride, 5-15% of calcium fluoride, 1-8% of barium chloride and 3-10% of rare earth activator. Said ivnention flux has high activity, proper melting point, density, viscosity and surface tension, and can greatly raise mechanical property of magnesium alloy and corrosion resistance.

Description

Technical field: [0001] The invention relates to a magnesium alloy rare earth compound flux and a production method thereof, which are used for refining treatment of removing impurity elements and non-metallic inclusions mixed in the alloy during the magnesium alloy smelting process, and belong to the field of metal materials and metallurgy. Background technique: [0002] Magnesium is chemically active. Magnesium alloys often contain a large amount of oxides and impurity elements such as Fe, Ni, and Cu. These impurities significantly reduce the mechanical properties and corrosion resistance of magnesium alloys. Therefore, during the smelting process of magnesium alloys, fluxes should be used for refining treatment. The purpose of refining treatment is to remove impurity elements and non-metallic inclusions such as magnesium oxide mixed in the alloy. It is required that the flux can adsorb impurities well and be completely separated from the magnesium alloy melt to avoid flux...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C23/00
Inventor 吴国华翟春泉卢晨曾小勤丁文江
Owner SHANGHAI HAOHUA MOLD
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