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A kind of melting protection method of magnesium and magnesium alloy

A magnesium alloy and pure magnesium technology, applied in the field of magnesium and magnesium alloy smelting protection, can solve the problems of complex vacuum system and high cost of magnesium alloy, and achieve obvious economic benefits, low production cost and good protection effect

Inactive Publication Date: 2017-03-22
淄博德源金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vacuum smelting method requires a complex vacuum system and an inflatable device to prevent magnesium evaporation, and the cost of vacuum smelted magnesium alloys is high

Method used

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  • A kind of melting protection method of magnesium and magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: remelting AZ91 magnesium alloy:

[0018] Use a crucible resistance furnace to remelt the AZ91 magnesium alloy, cut the AZ91 magnesium alloy ingot into small pieces of charge whose size is slightly smaller than the inner diameter of the crucible, put the small piece of AZ91 magnesium alloy ingot into the crucible, and then place the size slightly smaller than the surface size of the magnesium alloy melt, Graphite cover with a thickness of 6 mm. Raise the temperature to 680°C. After the charge is completely melted, remove the graphite cover, use R2 flux to refine the AZ91 magnesium alloy melt, remove slag, and quickly and evenly sprinkle graphite powder accounting for 0.3% of the total melting amount of AZ91 magnesium alloy on the On the surface of the AZ91 magnesium alloy melt, under the protection of graphite powder, keep warm at 680°C for 0.5h, take out the crucible, and air-cool. Carbon elemental graphite has an excellent protective effect on remelted A...

Embodiment 2

[0019] Embodiment 2: smelting AZ91 magnesium alloy:

[0020] The AZ91 magnesium alloy was melted in a crucible resistance furnace. Cut the pure magnesium ingot into a small piece of charge whose size is slightly smaller than the inner diameter of the crucible, put the small piece of pure Mg ingot into the crucible, and then place a graphite cover with a size slightly smaller than the surface size of the magnesium alloy melt and a thickness of 6 mm. Raise the temperature to 680°C. After the charge is completely melted, remove the graphite cover, use R2 flux to refine the magnesium melt, remove slag, and quickly and evenly sprinkle graphite powder, which accounts for 1.0% of the total melting amount of AZ91 magnesium alloy, on the magnesium melt. On the body surface, under the protection of graphite powder, the temperature is raised to 720°C, and pure aluminum, pure zinc, and aluminum-manganese intermediate alloy are added. After the alloying elements are completely melted, the ...

Embodiment 3

[0021] Embodiment 3: remelting pure magnesium:

[0022] Pure magnesium is remelted in a crucible resistance furnace. Cut the pure magnesium ingot into small pieces of charge whose size is slightly smaller than the inner diameter of the crucible, put the small piece of pure magnesium ingot into the crucible, and then place a graphite cover with a size slightly smaller than the surface size of the magnesium melt and a thickness of 6 mm. Raise the temperature to 680°C. After the charge is completely melted, remove the graphite cover, use R2 flux to refine the magnesium melt, remove slag, and quickly and evenly sprinkle graphite powder, which accounts for 3% of the total melting amount of pure magnesium, on the pure magnesium melt. On the body surface, under the protection of graphite powder, keep warm at 680°C for 0.5h, take out the crucible, and air-cool. Carbon elemental graphite has an excellent protective effect on the smelting of pure magnesium. Graphite powder is easily s...

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Abstract

The invention relates to a magnesium and magnesium alloy smelting protective method, which includes following steps: (1) heating furnace burden of magnesium or magnesium alloy to melt the furnace burden; (2) when the furnace burden is molten completely, refining and slagging-off the furnace burden, and quickly and uniformly sprinkling simple substance of carbon onto the surface of the magnesium and magnesium alloy melt for protecting the magnesium and magnesium alloy melt; and (3) performing alloying, refining or pouring to the magnesium and the magnesium alloy. Compared with a smelting protective method of the magnesium and the magnesium alloy in the prior art, by means of the simple substance of carbon as a smelting protective medium of the magnesium and the magnesium alloy, the method can satisfy the requirements of low cost, low GWP, zero-emission of harmful gas and no reduction of mechanical performances of the magnesium and the magnesium alloy during the magnesium and magnesium alloy smelting protection. The method has a very high advantage and is great in application prospect.

Description

technical field [0001] The invention relates to a melting protection method for magnesium and magnesium alloys, belonging to the technical field of magnesium alloy metallurgy. Background technique [0002] Magnesium alloy has the characteristics of light specific gravity, high specific strength and specific stiffness, and plays an important role in energy saving and emission reduction. With people's increasing concern on energy and environment, the application of magnesium alloy as a lightweight material is receiving unprecedented attention. However, the affinity between magnesium and oxygen is high, the heat of formation of magnesium oxide is high and the structure is loose, and magnesium will be severely oxidized, burned, and even exploded at high temperatures. Therefore, the flame retardant protection of magnesium alloy melts is the primary issue in the production of magnesium alloys. In order to solve the problem of flame retardant protection of magnesium alloy melts, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C23/00C22C1/06
Inventor 李卫红周吉学刘运腾詹成伟赵东清唐守秋杨院生
Owner 淄博德源金属材料有限公司
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