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Magnesium alloy melt multistage compound purification method

A composite purification, magnesium alloy technology, applied in the direction of improving process efficiency, can solve the problems of efficient impurity removal, cannot be achieved at the same time, etc., to achieve the effect of improving quality

Active Publication Date: 2014-05-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the highly targeted non-flux purification process of magnesium alloys, it is impossible to achieve both efficient impurity removal and degassing at the same time

Method used

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  • Magnesium alloy melt multistage compound purification method
  • Magnesium alloy melt multistage compound purification method
  • Magnesium alloy melt multistage compound purification method

Examples

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Effect test

Embodiment 1

[0035] This embodiment relates to a refining flux of magnesium alloy AZ91 combined with rotary blowing gas and ceramic foam filter multi-stage composite purification method; 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, the AZ91 magnesium alloy was melted and the temperature was raised to 720°C, and the refining flux RJ2 (No. 2 refining flux) was added in a mass ratio of 1% to the melt. At the same time, put the blowing device with rotating blades into the magnesium alloy melt and start to rotate and pass in argon or nitrogen gas. The hole diameter of the blowing head is 0.1mm, the speed of the rotating blowing rotor is 100 rpm, and the blowing flow rate is 2 liters / min. , the gas injection time is 20 minutes. After the spraying is over, let it stand for 20 minutes, then cool down to 720°C, remove the scum on the surface of the alloy liquid, and then pour...

Embodiment 2

[0039] This embodiment relates to a high-strength heat-resistant rare earth magnesium alloy Mg-10Gd-3Y-0.5Zr refining flux combined with rotary blowing gas and ceramic foam filter multi-stage composite purification method; 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, the Mg-10Gd-3Y-0.5Zr magnesium alloy was melted, and then the temperature was raised to 720° C., and the refining flux JDMJ (Jiaotong University magnesium alloy refining agent) was added with a mass ratio of 1.5% to the melt. At the same time, put the conventional blowing device with rotating blades into the magnesium alloy melt and start to rotate and feed in argon or nitrogen. Minutes, 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 pour it into the sand m...

Embodiment 3

[0043] This embodiment relates to a traditional commercial magnesium alloy ZK60 refining flux combined with rotary injection gas and ceramic foam filter multi-stage composite purification method; 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, the ZK60 magnesium alloy is melted and then heated to 720° C., adding a refining flux RJ6 (No. 6 refining flux) with a mass ratio of 2% to the melt. At the same time, put the conventional blowing device with rotating blades into the magnesium alloy melt and start to rotate and feed in argon or nitrogen. The hole diameter of the blowing head is 0.2mm, the rotational speed of the rotating blowing rotor is 200 rpm, and the blowing flow rate is 2.5 liters / min. minutes, and the gas injection time is 10 minutes. After the spraying is completed, let it stand for 20 minutes, then cool down to 720°C, remove the scum on the surf...

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Abstract

The invention discloses a magnesium alloy melt multistage compound purification method which combines refining flux purification, rotating blowing gas purification and foamed ceramic filtration purification in one, to be more specific, rotating blowing gas treatment is performed simultaneously with flux purification of a magnesium alloy melt, and during melt pouring, a foamed ceramic filter is used for filtering and purifying, wherein larger inclusions in the magnesium alloy melt can be removed by the flux purification, meanwhile gas blowing stirring has excellent degassing capacity, and introduced inert gas or nitrogen gas bubbles enable the inclusions suspended in the magnesium alloy melt to rapidly float upward to the melt surface to effectively remove the inclusions and especially tiny inclusions in the melt. Subtle inclusion particles and liquid flux inclusions in the alloy melt can be further filtered by the foamed ceramic filtration purification, the quality of magnesium alloy is greatly improved, and the method also promotes the homogenization of magnesium alloy components. At the same time, the method of the invention is simple, easy to operate, and suitable for experiments and industrial application.

Description

technical field [0001] The invention relates to the technical field of metal melt treatment, in particular to a multi-stage composite purification method for a magnesium alloy melt. Background technique [0002] my country is the country with the richest magnesium ore resources in the world. The Chinese Academy of Engineering pointed out in the 2005 "Research Report on the Development Strategy of my country's Rich Resources Magnesium and Magnesium Alloys" that magnesium metal has become a It is an inevitable choice for the sustainable development of my country's material industry in the 21st century. Because magnesium alloy has low density, high specific strength and fatigue strength, good specific elastic modulus and excellent cutting performance, magnesium alloy is widely used in a series of advanced defense fields and daily manufacturing, for example, automobile weight reduction and energy saving And environmental protection requirements promote the large-scale developmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C23/00C22B9/02C22B9/05C22B9/10C22B26/22
CPCY02P10/20
Inventor 刘文才吴国华魏广玲丁文江
Owner SHANGHAI JIAO TONG UNIV
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