Method for removing magnesium oxide inclusions in magnesium or magnesium alloy melt
A magnesium alloy and magnesium oxide technology, which is applied in the field of metal melt purification, can solve problems such as reducing the quality of magnesium or magnesium alloy melt, and achieve the effect of good effect, high efficiency and quality improvement.
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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 metallography 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 0.2wt.% 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 smaller than The magnesia inclusion content of 0.5mm 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 0.6wt.% 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 let it ...
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 It was melted under the protection of mixed gas, heated to 650°C, kept standing for 120minn (stationary refining), and sampled from the middle of the crucible. After solidification, it was detected by quantitative metallography combined with EDS and XRD that the content of magnesium oxide inclusions was 1.23%, and the size was smaller than The magnesia inclusion content of 0.5mm 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 Melt under the protection of mixed gas, heat to 650 ° C, add 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 1.2wt.%); stir for 30 minutes, make the added element Sm and Magnesium oxide inclus...
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