Compound treatment purifying method of magnesium alloy melt

A technology of melt composite treatment and magnesium alloy, applied in the field of metal melt treatment, can solve the problems of affecting zirconium refinement effect, effective zirconium element loss, reducing zirconium yield, etc., achieving short treatment time, promoting homogenization, simple method effect

Active Publication Date: 2014-04-16
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the density of zirconium is much higher than that of magnesium, and it is easy to settle in the magnesium melt, resulting in a large loss of zirconium
In addition, the activity of zirconium is very strong, and it is easy to react with the inclusions in the magnesium melt, resulting in a large loss of effective zirconium elements, greatly reducing the yield of zirconium, and seriously affecting the refining effect of zirconium

Method used

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  • Compound treatment purifying method of magnesium alloy melt
  • Compound treatment purifying method of magnesium alloy melt
  • Compound treatment purifying method of magnesium alloy melt

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This embodiment relates to a compound treatment and purification method of a rare earth magnesium alloy Mg-3Nd-0.2Zn-0.5Zr (NZ30K); it specifically includes the following steps: 6 / CO 2 or SO 2 / CO 2 or CO 2 / Ar or difluoromethane HFC-32 or HFC134a (ie C 2 h 2 f 4 ) under the protection of gas, melt the Mg-3Nd-0.2Zn-0.5Zr magnesium alloy and raise the temperature to 720°C, add an appropriate amount of refining flux RJ6, and at the same time put the conventional blowing device with rotating blades into the magnesium alloy melt to start rotating and inject For argon or nitrogen, the rotational speed of the rotary injection rotor is 60 rpm, the flow rate of argon or nitrogen is 8 liters / min, and the gas injection time is 30 minutes. After the spraying is finished, let it stand for 20 minutes, then cool down to 720°C, remove the scum on the surface of the alloy liquid, and then carry out sand casting.

[0037] Traditional Approach: In SF 6 / CO 2 or SO 2 / CO ...

Embodiment 2

[0040] This embodiment relates to a compound treatment and purification method of a high-strength heat-resistant rare earth magnesium alloy Mg-10Gd-3Y-0.5Zr (GW103K); it specifically includes the following steps: 6 / CO 2 or SO 2 / CO 2 or CO 2 / Ar or difluoromethane HFC-32 or HFC134a (ie C 2 h 2 f 4 ) Under the protection of gas, melt the Mg-10Gd-3Y-0.5Zr magnesium alloy and heat it up to 740°C, add an appropriate amount of refining flux JDMJ, and at the same time put the conventional blowing device with rotating blades into the magnesium alloy melt to start rotating and inject argon Gas or nitrogen, the rotational speed of the rotary blowing rotor is 150 rpm, the flow rate of argon or nitrogen is 2 liters per minute, and the blowing time is 10 minutes. After the spraying is finished, let it stand for 20 minutes, then cool down to 720°C, remove the scum on the surface of the alloy liquid, and then carry out sand casting.

[0041] Traditional Approach: In SF 6 / CO 2...

Embodiment 3

[0044] This embodiment relates to a compound treatment and purification method of a traditional commercial magnesium alloy Mg-6Zn-0.5Zr (ZK60); specifically comprises the following steps: 6 / CO 2 or SO 2 / CO 2 or CO 2 / Ar or difluoromethane HFC-32 or HFC134a (ie C 2 h 2 f 4 ) under the protection of gas, melt the Mg-6Zn-0.5Zr magnesium alloy and heat it up to 720°C, add an appropriate amount of refining flux RJ6, and at the same time put the conventional blowing device with rotating blades into the magnesium alloy melt to start rotating and pass in argon or Nitrogen, rotary injection rotor speed 300 rpm, argon or nitrogen flow rate 1 liter / min, gas injection time 20 minutes. After the spraying is finished, let it stand for 20 minutes, then cool down to 700°C, remove the scum on the surface of the alloy liquid, and then carry out sand casting.

[0045] Traditional Approach: In SF 6 / CO 2 or SO 2 / CO 2 or CO 2 / Ar or difluoromethane HFC-32 or HFC134a (ie C 2 h 2 ...

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Abstract

The invention discloses a compound treatment purifying method of a magnesium alloy melt. The method comprises the following step: carrying out gas blowing stirring treatment while purifying the magnesium alloy melt by a refining flux, wherein the refining flux can purify and remove bigger inclusions of the magnesium alloy melt, and meanwhile, bubbles of inert gases or nitrogen introduced by gas blowing stirring enable the inclusions suspended in the magnesium alloy melt to quickly come up to the surface of the melt, so that inclusions in the magnesium alloy melt are effectively removed, particularly fine inclusions, thereby improving the quality of a magnesium alloy to a great extent. Furthermore, the method further promotes homogenization of magnesium alloy components, improves the yield of a zirconium refiner and controls segregation of zirconium element. Therefore, the method disclosed by the invention has the compound purifying and refining functions, and is short in treatment time, simple and suitable for experimental and industrial applications.

Description

technical field [0001] The invention relates to the technical field of metal melt treatment, in particular to a composite treatment and purification method for magnesium alloy melt. Background technique [0002] Due to the special working environment of aviation, aerospace and weaponry, structural weight reduction and structural load-bearing and functional integration are important directions for their development. Magnesium alloys have low density, high specific strength and specific stiffness, excellent shock resistance and cutting performance. Good and other advantages, it has broad application prospects in the fields of aerospace and national defense military industries, and is known as a green material for the sustainable development of resources and the environment in the 21st century, and has become the focus of widespread attention in all countries in the world. Magnesium is one of the most abundant elements on the earth, and my country is a major producer of magnesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C23/00C22C1/06
Inventor 刘文才吴国华梅俊丁文江王少华闵昌万
Owner SHANGHAI JIAO TONG UNIV
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