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A method for removing magnesium oxide inclusions in magnesium or magnesium alloy melt

A magnesium alloy and magnesium oxide technology, applied in the field of metal melt purification, can solve problems such as reducing the quality of magnesium or magnesium alloy melt, and achieve good effect, high efficiency, and quality improvement.

Active Publication Date: 2021-11-30
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to solve the problem that magnesium oxide in magnesium and magnesium alloy melts, especially small-sized magnesium oxide, is difficult to remove, resulting in magnesium oxide being retained as solid inclusions and reducing the amount of magnesium or magnesium alloy melts. Quality problems, provide a method to remove magnesium oxide inclusions in magnesium or magnesium alloy melt

Method used

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  • A method for removing magnesium oxide inclusions in magnesium or magnesium alloy melt

Examples

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Effect test

Embodiment 1

[0033] Using AZ91 magnesium alloy scrap as raw material, the experiments were divided into two groups.

[0034] The first group is the reference experiment. AZ91 Magnesium Alloy Scrap in SF 6 +N 2 Melt under the protection of mixed gas, heat to 650°C, add refining flux and stir, then keep warm for 30 minutes (flux refining + static refining), take samples from the middle of the crucible, and use quantitative gold phase combined with EDS and XRD to detect magnesium oxide after solidification The inclusion content is 0.67%, and the inclusion content of magnesium oxide with a size smaller than 0.5mm is 0.54%.

[0035] The second group was operated using the method of the present invention. AZ91 Magnesium Alloy Scrap in SF 6 +N 2 Melt under the protection of mixed gas, heat to 650°C, add 0.2 wt.% pure metal Sn to the upper part of the magnesium melt with a feeding tool and melt; stir for 5 minutes to fully react the added pure metal element Sn and magnesium oxide inclusions; ...

Embodiment 2

[0038] Using AZ61 magnesium alloy scrap as raw material, the experiments were divided into two groups.

[0039] The first group is the reference experiment. AZ61 Magnesium Alloy Scrap in SF 6 +N 2 Melt under the protection of mixed gas, heat to 650°C, keep it standing for 75 minutes (still refining), take a sample from the middle of the crucible, and after solidification, use the method of quantitative metallography combined with EDS and XRD to detect that the content of magnesium oxide inclusions is 0.82%, and the size is less than The inclusion content of 0.5mm magnesium oxide is 0.58%.

[0040] The second group was operated using the method of the present invention. AZ61 Magnesium Alloy Scrap in SF 6 +N 2 Melt under the protection of mixed gas, heat to 650°C, add 0.6 wt.% pure metal Cd to the upper part of the magnesium melt with a feeding tool and melt; stir for 15 minutes to fully react the added pure metal element Cd and magnesium oxide inclusions; keep warm And le...

Embodiment 3

[0043] Using AZ31 magnesium alloy scrap as raw material, the experiments were divided into two groups.

[0044] The first group is a reference experiment, the AZ31 magnesium alloy scrap in SF 6 +N 2 Melt under the protection of mixed gas, heat to 650°C, keep it standing for 120minn (still refining), take a sample from the middle of the crucible, and after solidification, use the method of quantitative metallography combined with EDS and XRD to detect that the content of magnesium oxide inclusions is 1.23%, and the size is less than The inclusion content of 0.5mm magnesium oxide is 0.84%.

[0045] The second group adopts the method of the present invention to operate: the AZ31 magnesium alloy scrap is in SF 6 +N 2 Melting under the protection of mixed gas, heating to 650 °C, adding the Mg-Sm master alloy to the upper part of the magnesium melt with a feeding tool to melt (the added Sm element content is 1.2 wt.%); stirring for 30 minutes, so that the added element Sm and Ma...

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Abstract

The invention discloses a method for removing magnesium oxide inclusions in magnesium or magnesium alloy melts, and belongs to the technical field of metal melt purification. The method is that during the smelting process of magnesium or magnesium alloy, metal elements capable of reduction reaction with magnesium oxide are added to magnesium or magnesium alloy melt, so that the added metal elements and magnesium oxide inclusions undergo reduction reaction to form density ratio Metal oxides and magnesium with high density of magnesium or magnesium alloys; and then by standing still, the newly formed metal oxides settle to the bottom of the furnace to achieve the purpose of purifying magnesium or magnesium alloy melts. The invention can effectively remove the content of magnesium oxide inclusions in magnesium or magnesium alloy melts, especially for the small-sized magnesium oxide (less than 0.5 mm) that cannot be removed in the prior art, and has a good effect of removing magnesium alloy inclusions, improving the Magnesium or magnesium alloy quality.

Description

technical field [0001] The invention relates to the technical field of metal melt purification, in particular to a method for removing magnesium oxide inclusions in magnesium or magnesium alloy melts. Background technique [0002] Magnesium and its alloys have low density, high specific strength and specific stiffness, high damping and shock absorption performance, excellent thermal conductivity and electromagnetic shielding, good casting and machining performance, and rich resource support, becoming the most potential metal One of the materials, it has broad application prospects in ground vehicles, aerospace, 3C products and other fields. [0003] From the perspective of the whole life cycle, the production of magnesium and its alloy raw material ingots (including semi-continuous ingots required for plastic processing), casting production and remelting of waste magnesium must involve smelting operations, that is, it is necessary to use magnesium or magnesium alloys to melt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C23/00C22B9/10C22B26/22
CPCC22B9/10C22B26/22C22C1/06C22C23/00
Inventor 游国强龙思远周凯旋姚繁锦彭力真
Owner CHONGQING UNIV
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