Melting method for magnesium alloy containing high reactivity elements

A technology of element magnesium and magnesium alloy, applied in the field of magnesium alloy smelting, can solve the problems of damage to the performance of alloy products, easy oxidation, combustion, etc., and achieve the effect of preventing oxidation and improving alloying efficiency

Inactive Publication Date: 2012-11-14
QINGHAI SUNGLOW MAGNESIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under higher temperature conditions, whether in the air or under the cover of melting flux, they are very easy to oxidize and even burn, which will seriously reduce the alloying efficiency of these alloying elements, and even bring oxide inclusions into the alloy melt. body, thereby deteriorating the quality of the alloy melt and impairing the performance of the alloy product
Using vacuum plus protective gas melting can overcome the above shortcomings to a certain extent, but it will increase the melting cost of the alloy, and it is not suitable for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Melting AZ31-0.5Sr alloy, the specific composition is (mass percentage): Mg: 95.20%; Al: 2.90%; Zn: 1.10%; Sr: 0.50%; Mn, Fe, Si, Ni, Cu, Na less than 0.30%. Melting is carried out in ordinary crucible resistance furnace or induction furnace. Put the AZ31 alloy ingot into a low-carbon steel or stainless steel crucible, preheat it at 200°C for 20 minutes, then raise the temperature to 680°C until the AZ31 alloy ingot is completely melted, and then remove the slag in the alloy melt. Use flux or gas protection.

[0016] At the same time, add the pure metal Sr block soaked in industrial kerosene for 5 minutes to the above-mentioned AZ31 alloy melt according to the formula composition, and stir at a speed of 10 rpm until the metal Sr block is completely melted, generally stirring for 1- It takes 2 minutes. During the stirring process, prevent the magnesium alloy melt from splashing, so as to avoid safety accidents and reduce alloy loss.

[0017] Then after standing for 5 m...

Embodiment 2

[0020] Melting AZ31-0.8La alloy, the specific composition is (mass percentage): Mg: 94.70%; Al: 3.10%; Zn: 1.10%; La: 0.80%; Mn, Fe, Si, Ni, Cu, Na less than 0.30%. Melting is carried out in a common crucible resistance furnace. Put the AZ31 alloy ingot into a low-carbon steel or stainless steel crucible, preheat it at 200°C for 20 minutes, then raise the temperature to 720°C until the AZ31 alloy ingot is completely melted, and then remove the slag in the alloy melt. Use flux or gas protection.

[0021] At the same time, for the Mg-20La master alloy blocks soaked in liquid paraffin for 20 minutes, the mineral oil can be added according to the formula as long as the ignition point is less than or equal to 680°C and does not chemically react with commonly used pure metals or master alloys. Stir it into the above-mentioned AZ31 alloy melt at a rate of 15 rpm until the alloy block is completely melted. During the stirring process, prevent the magnesium alloy melt from splashing. ...

Embodiment 3

[0025] Melting AZ61-1.0Ce alloy, the specific composition is (mass percentage): Mg: 92.00%; Al: 5.80%; Zn: 0.90%; Ce: 1.0%; Mn, Fe, Si, Ni, Cu, Na less than 0.30%. Melting is carried out in a common crucible resistance furnace. Put the AZ61 alloy ingot into a low-carbon steel or stainless steel crucible, preheat it at 200°C for 20 minutes, then raise the temperature to 740°C until the AZ61 alloy ingot is completely melted, and then remove the slag in the alloy melt. Use flux or gas protection.

[0026] At the same time, the Mg-20Ce intermediate alloy block soaked in industrial kerosene for 30 minutes was added to the above-mentioned AZ61 alloy melt according to the formula composition, and stirred at a speed of 30 rpm until the alloy block was completely melted. , to prevent the magnesium alloy melt from splashing.

[0027] After standing for 5 minutes, the alloy melt was cast into an ingot.

[0028] X-ray fluorescence spectroscopy was used to analyze the composition of the...

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Abstract

The invention discloses a melting method for a magnesium alloy containing high reactivity elements, comprising the steps of oil immersion, adding and stirring. The method is characterized by that: utilizing the characteristics of some mineral oil that does not react with active metals used for adding in melting magnesium alloy, such as Mg, Ca, La, Ce, Y, and Sr, putting the metals and intermediate alloys containing the metals in the mineral oil to prevent oxidation of the metals in preservation; and adding fine metals or intermediate alloys with mineral oil on the surface in the melt. Becausethe fire point of the mineral oil is low, the mineral oil burns around the surface of the alloy melt in a crucible to rapidly consume the air around the surface of the alloy melt, so that an effective isolation between the surface of the alloy melt and the ambient air is formed, the oxidation of the alloy melt at high temperature is prevented effectively, the alloying of the fine metals or intermediate alloys containing high reactivity under the condition of air insulation is fully realized, and the alloying efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a magnesium alloy melting method. Background technique [0002] Magnesium alloy has the characteristics of light weight, high specific strength, excellent vibration damping performance and electromagnetic shielding performance, and has been more and more widely used in the fields of national defense and military industry, vehicles, 3C products and so on. [0003] In order to further improve the comprehensive performance of magnesium alloys, it is necessary to modify the composition and structure of magnesium alloys. A commonly used modification method is to add an appropriate amount of alloying elements to magnesium alloys, especially alkaline earth elements such as Ca and Sr and rare earth elements such as La, Ce, and Y. These elements can refine the microstructure of magnesium alloys, thereby improving the comprehensive mechanical properties of magnesium alloys. There are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/03C22C23/00
Inventor 蒋斌潘复生杨青山李瑞红肖璐
Owner QINGHAI SUNGLOW MAGNESIUM
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