New process for purifying magnesium alloy

A magnesium alloy and new process technology, applied in the field of purification process of impurity elements, can solve problems such as adverse effects on the overall performance of molten magnesium alloy materials, and achieve the effects of good overall purification effect, reduction of impurity content and low production cost

Active Publication Date: 2012-09-19
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these fluxes will bring in new impurities or inclusions while removing impurities, which will have an adverse effect on the purity of the melt and the overall performance of the magnesium alloy material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Mg-Zn-Zr magnesium alloy was casted by conventional gravity casting method.

[0022] 1) The raw materials are magnesium ingots, zinc ingots and Mg-28%Zr master alloy, and the design composition of alloy elements is 5.8% Zn and 0.65% Zr;

[0023] 2) Melt in a graphite crucible, heat up to melt pure magnesium, and when the temperature is 740-750°C, add zinc ingots and Mg-Zr intermediate alloys, and stir the alloy liquid after alloying to make the ingredients uniform;

[0024] 3) The alloy liquid is refined at a temperature of 750-760°C, the refining time is about 5 minutes, and then the slag is removed;

[0025] 4) Analyze the composition of the alloy liquid before the furnace, and continue to the next step after the composition of the main alloy elements is qualified;

[0026] 5) Under the temperature condition of 730-740°C, heat-preserve the melt for 30 minutes;

[0027] 6) After heat preservation and static treatment, disconnect the power supply of the melting furnac...

Embodiment 2

[0031] Mg-Zn-Zr magnesium alloy was prepared by semi-continuous casting technique.

[0032] 1) The raw materials are magnesium ingots, zinc ingots and Mg-28%Zr master alloy, and the design composition of alloy elements is 5.5% Zn and 0.6% Zr;

[0033] 2) Melt in a steel crucible, heat up to melt pure magnesium, when the temperature is 760-770°C, add zinc ingots and Mg-Zr intermediate alloys, and stir the alloy liquid after alloying to make the ingredients uniform;

[0034] 3) The alloy liquid is refined at a temperature of 750-760°C, the refining time is about 3-5min, and then the slag is removed;

[0035] 4) Analyze the composition of the alloy liquid before the furnace, and continue to the next step after the composition of the main alloy elements is qualified;

[0036] 5) Under the temperature condition of 750-760 ℃, heat preservation and standing treatment of the melt for 30 minutes;

[0037] 6) After heat preservation and static treatment, disconnect the power supply of...

Embodiment 3

[0041] Mg-Zn-Zr magnesium alloy was prepared by semi-continuous casting technique.

[0042] The only difference from Example 2 lies in the resting time of the melt in step 5) of the preparation process, and the holding time of this alloy melt is 45 minutes.

[0043] The chemical composition analysis results of the obtained magnesium alloy ingots are shown in Table 1. It can be seen that the purity of this alloy is high, the amount of common impurity elements is very small, the impurity content of Fe is 0.0013%, and the total content of impurity elements in the alloy is less than 0.00425%, which is lower than that of Example 2. Appropriately extending the heat preservation and standing time is more conducive to the settlement of impurity elements , so that the purification effect is more obvious.

[0044]

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Abstract

The invention discloses a new process for purifying a magnesium alloy material. The process is based on a conventional magnesium alloy casting process, no any extra purification fusing agent is added, and the aim of effectively purifying alloy is achieved through adopting an optimized fusant heat preservation and standing process. The concrete steps for purifying comprises: (1) carrying out heat preservation and standing on a magnesium alloy fusant which is refined and has chemical compositions meeting the requirement, wherein the temperature for heat preservation and standing of the fusant is 730-780 DEG C, and the time for heat preservation and standing is 30-100 minutes; and (2) switching off a smelting furnace, reducing the temperature of the fusant to be 710-730 DEG C, casting the fusant to a mould, and hydrocooling or directly air cooling and solidifying to obtain a magnesium alloy cast ingot. The process has an obvious purification effect, the content of common impurity elements such as Fe, Si, Ni and Cu in the magnesium alloy can be reduced obviously without bringing in new impurities or being mixed, the quality and the overall performance of the magnesium alloy material are improved obviously, and process equipment is conventional and universal equipment with lower cost, easiness in operation, and easiness in implementation in industry.

Description

technical field [0001] The invention relates to a melting and casting process of magnesium alloys, in particular to a purification process for removing Fe, Si, Ni, Cu and other impurity elements during the smelting process. [0002] Background technique [0003] In recent years, with the tense supply and demand of energy and the massive consumption of non-renewable energy, the energy crisis has gradually become prominent; and the environmental pollution in the world is becoming more and more serious, and it is very urgent to reduce exhaust emissions. In order to save energy and protect the environment, the demand for new materials is more urgent in various countries, especially light alloy materials, such as magnesium and magnesium alloy materials. Magnesium alloy is currently the lightest engineering metal material in industrial applications. It has low density, high specific strength and rigidity, strong damping, vibration and noise reduction capabilities, excellent liqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04
Inventor 潘复生陈先华毛建军
Owner CHONGQING UNIV
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