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Refiner containing nitrogen for magnesium alloy as well as preparing and using method thereof

A refiner, magnesium alloy technology, applied in the field of metal materials, can solve the problems of reducing the corrosion resistance of magnesium alloys, environmental and human hazards, high processing temperature, etc., to improve corrosion resistance, improve strength and toughness, and refine grains Effect

Inactive Publication Date: 2008-08-27
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these methods, there are problems such as high treatment temperature, short holding time, inconvenient process, and reduced corrosion resistance of magnesium alloys.
In the carbon metamorphism method, a large amount of chlorine gas will be released during the metamorphism process, which will cause great harm to the environment and the human body, and the decay period of this method is relatively short, generally about 30 minutes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of refiner:

[0019] Vacuum the electromagnetic induction furnace and refill it with argon, put 900g of pure magnesium and 100g of pure aluminum (>99.9%) into the vacuum electromagnetic induction furnace and heat it to 750°C. After it is completely melted, add 30g of aluminum foil wrapped in the feeding box Magnesium nitride powder (the particle size of magnesium nitride powder is 30μm), use the electromagnetic induction effect of the induction furnace to stir the melt, keep it warm for 30 minutes, pour out the intermediate alloy ingot, and obtain the refined magnesium alloy containing aluminum nitride agent. The chemical composition of the prepared refining agent is: 90% of magnesium, 9% of aluminum and 1% of aluminum nitride.

[0020] Refinement process:

[0021] in CO 2 +SF 6 Add 2000g of industrial AZ31 magnesium alloy ingot to the gas-shielded resistance crucible furnace. After the alloy is melted, add 0.5% magnesium alloy refiner. In metal type. ...

Embodiment 2

[0027] Preparation of refiner:

[0028] Vacuum the electromagnetic induction furnace, backfill with argon, heat 800g of magnesium and 200g of aluminum to 800°C, and after the alloy is completely melted, add 35g of magnesium nitride powder wrapped in aluminum foil through the charging box (the amount of magnesium nitride powder The particle size is 25 μm), using the electromagnetic induction effect of the induction furnace to stir the melt, keeping it warm for 45 minutes, pouring out the intermediate alloy ingot, and obtaining the magnesium alloy refiner containing aluminum nitride. The chemical composition of the obtained refining agent is: 79% of magnesium, 19.5% of aluminum and 1.5% of aluminum nitride.

[0029] Refinement process:

[0030] in CO 2 +SF 6 Add 2000g of industrial AZ31 magnesium alloy ingot to the gas-shielded resistance crucible furnace. After the alloy is melted, add 1% refiner, stir the alloy melt fully after melting, keep it at 730°C for 20 minutes, and ...

Embodiment 3

[0036] Preparation of refiner:

[0037] Vacuum the electromagnetic induction furnace, backfill with argon, heat 700g of magnesium and 300g of aluminum to 850°C, and after the alloy is completely melted, add 40g of magnesium nitride powder wrapped in aluminum foil (magnesium nitride powder of magnesium nitride powder) through the charging box The particle size is 20 μm), using the electromagnetic induction effect of the induction furnace to stir the melt, keeping it warm for 60 minutes, and pouring out the intermediate alloy ingot to obtain the magnesium alloy refiner containing aluminum nitride. The chemical composition of the prepared refining agent is: 70% of magnesium, 28% of aluminum and 2% of aluminum nitride.

[0038] Refinement process:

[0039] in CO 2 +SF 6 Add 2000g of industrial AZ31 magnesium alloy ingot to the gas-shielded resistance crucible furnace. After the alloy is melted, add 1.5% refiner, stir the alloy melt fully after melting, keep it at 750°C for 20 m...

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Abstract

The invention provides a process for preparing nitrogen containing refiner for magnesium alloy, which comprises the following steps: respectively adding pure magnesium and pure aluminium in a vacuum electromagnetic induction furnace according to the mass ratio which is 7-9:1-3, adding Mg3N2 powder according to 3%-4% of aluminum-magnesium melt quality after heating up to alloy is completely melted, preserving heat, and casting, wherein percentage by weight of each component of nitrogen containing refiner which is got is that magnesium 70-90%, aluminum 9-29% and aluminium nitride 1-2%, adding refiner in the process for preparing magnesium alloy, wherein the adding amount is 0.5-1.5%, and the addition temperature is 700-750DEG C. The purpose of refining magnesium alloy crystal grain and improving strength toughness and corrosion resistance property of magnesium alloy can be achieved through utilizing the refiner to prepare Mg-Al magnesium alloy, the technique is simple, and addition amount and refining effect are easy to be controlled.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a refiner for magnesium alloys used for refining magnesium alloys and a preparation method thereof. Background technique [0002] In recent years, the application of magnesium alloys in the communication, electronics and automobile industries has developed rapidly, but the hexagonal close-packed crystal structure of magnesium alloys determines its poor plastic deformation ability, so it is extremely important to improve the mechanical properties and processing properties of magnesium alloys. Practice has proved that fine and equiaxed grain structure can improve the plastic deformation ability of magnesium alloy and have higher strength. [0003] So far, there have been many methods for grain refinement of magnesium alloys, such as: overheating method, Elfinal method (that is, adding FeCl 3 ), carbon modification method, melt stirring method, adding particles such as Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C23/02
Inventor 赵红亮关绍康翁康荣周占霞刘旭东
Owner ZHENGZHOU UNIV
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