Magnesium and magnesium alloy composite protection fire-proof covering flux and its production method

A technology for covering flux and magnesium alloy, applied in the fields of metal materials and metallurgy, can solve the problems of severe combustion, unsatisfactory protection effect of foamed magnesium alloy covering agent, oxidation and even combustion of magnesium melt, etc. Excellent protection flame retardant effect, improve the effect of protection effect

Inactive Publication Date: 2005-06-29
SHANGHAI AIERSI LIGHT ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the actual production and research process, the magnesium melt sometimes needs to be heated to a high temperature of 760-800 ° C, and the melt often lasts for more than 3 hours at high temperature. At this time, the gas absorption and oxidation of the magnesium melt are particularly serious, even Vigorous combustion, but the RJ series fluxes commonly used at present and the foamed magnesium alloy covering agent introduced by the patent ZL00125301.8 have unsatisfactory protective effects at high temperatures and cannot meet the protection requirements, and the magnesium melt will still undergo violent oxidation or even burn

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Magnesium and magnesium alloy composite protective flame retardant covering flux composition (mass percentage): 70% magnesium chloride, 8% potassium chloride, 7% sodium chloride, 8% calcium chloride, 1% calcium fluoride, 1% magnesium oxide, 1 % cryolite, 1% magnesium carbonate, 3% sodium beryllium fluoride.

[0016] The production method of the flux is as follows: after the crucible is heated to a certain temperature, magnesium chloride, potassium chloride, sodium chloride, magnesium oxide, calcium chloride and cryolite are added, and after the temperature is partially melted, calcium fluoride is added, and the temperature is raised to 750 ℃, stir evenly, pour into blocks. After crushing, put it into a ball mill and grind it into powder, and sieve it with a No. 20 sieve. After that, magnesium carbonate and sodium beryllium fluoride are added and mixed with a ball mill. The prepared flux is put into an airtight container for later use.

[0017] When in use, add indust...

Embodiment 2

[0019] Magnesium and magnesium alloy composite protective flame retardant covering flux composition (mass percentage): 50% magnesium chloride, 18% potassium chloride, 7% sodium chloride, 1% calcium chloride, 8% calcium fluoride, 6% magnesium oxide, 5% % cryolite, 4% strontium carbonate, 1% beryllium chloride.

[0020] The production method of this flux is as follows: after the crucible is heated to a certain temperature, magnesium chloride, potassium chloride, sodium chloride, magnesium oxide, calcium chloride and cryolite are added, and after the temperature is raised to partial melting, calcium fluoride is added, and the temperature is raised to 770 ℃, stir evenly, pour into blocks. After crushing, put it into a ball mill and grind it into powder, and sieve it with a No. 30 sieve. Then add strontium carbonate and beryllium chloride and mix with a ball mill. The prepared flux is put into an airtight container for later use.

[0021] When in use, add industrial pure magnesi...

Embodiment 3

[0023] Magnesium and magnesium alloy composite protective flame retardant covering flux composition (mass percentage): 51% magnesium chloride, 8% potassium chloride, 16% sodium chloride, 3% calcium chloride, 3% calcium fluoride, 7% magnesium oxide, 2 % cryolite, 6% magnesium carbonate, 4% sodium beryllium fluoride.

[0024] The production method of this flux is as follows: after the crucible is heated to a certain temperature, magnesium chloride, potassium chloride, sodium chloride, magnesium oxide, calcium chloride and cryolite are added, after the temperature is raised to partial melting, calcium fluoride is added, and the temperature is raised to 790 ℃, stir evenly, pour into blocks. After crushing, put it into a ball mill and grind it into powder, and sieve it with a No. 40 sieve. After that, magnesium carbonate and sodium beryllium fluoride are added and mixed with a ball mill. The prepared flux is put into an airtight container for later use.

[0025] When in use, add...

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PUM

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Abstract

A magnesium and magnesium alloy composite protective flame-retardant covering flux and a production method thereof, the chemical components of the flux range in mass percent: 50-70% magnesium chloride, 8-18% potassium chloride, 7-16% sodium chloride, 1 -8% calcium chloride, 1-8% calcium fluoride, 1-7% magnesium oxide, 1-5% slagging agent cryolite, 0.5-6% carbonate foaming agent, 0.5-4% beryllium compound flame retardant. The flux of the present invention has a variety of composite protective and flame-retardant functions during use. The beryllium oxide protective film formed by the beryllium compound sprinkled on the surface of the melt makes the magnesium alloy have good flame-retardant performance, which obviously improves the protective effect and does not As a result, the alloy grains are coarse and the mechanical properties of the alloy are reduced. The inert gas generated during the use of the flux that does not react with magnesium covers the magnesium liquid, which further enhances the protective effect. The cryolite added to the flux is beneficial to improve the flux. Slag ability, and improve the physical properties of the flux.

Description

technical field [0001] The invention relates to a magnesium and magnesium alloy flux and a production method thereof, in particular to a magnesium and magnesium alloy covering flux with composite protection and flame retardancy to prevent oxidation and combustion during the magnesium alloy smelting process. It belongs to the field of metal materials and metallurgy. Background technique [0002] Magnesium is the lightest of the commonly used metal structural materials, and is widely used in aviation, automobile, electronic information, and machinery industries. But the chemical activity of magnesium is very strong, it is easy to oxidize in the air, and the oxide film formed is loose, which cannot play a protective role, especially at high temperature, the oxidation is intensified, causing combustion. Therefore, reducing and preventing the oxidation and combustion of magnesium alloys is one of the key issues to be solved in the application of magnesium alloys. At present, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/10C22C1/06
Inventor 吴国华丁文江
Owner SHANGHAI AIERSI LIGHT ALLOY
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