Grain refiner for magnesium alloy and preparation method thereof

A grain refiner and a technology for magnesium alloys, applied in the field of grain refiner for magnesium alloys and their preparation, can solve the problems of high reaction temperature, cannot be used in industrial production, and have not been widely used, and can reduce the reaction temperature. , Enlarge the production scale, and refine the effect with remarkable effect

Inactive Publication Date: 2010-11-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the methods currently used are all research in the laboratory and are not suitable for industrial production.
One is that the reaction temperature is higher and the aluminum fire consumption is high; the other is that the added aluminum carbon powder is not uniform, if stirred, the carbon is easy to float, and the yield is low; if not stirred, the carbon distribution is uneven, and the yield is low. The third is that the microstructure stabili

Method used

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  • Grain refiner for magnesium alloy and preparation method thereof
  • Grain refiner for magnesium alloy and preparation method thereof
  • Grain refiner for magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Aluminum powder, carbon powder, MgCO with a particle size of 50-400 mesh 3 Mix the powder and magnesium alloy No. 2 flux uniformly with a ball mill, and then dry it at 100°C for 5 hours to make a prefabricated powder. The weight percentage of each component is 30% of aluminum powder, 20% of carbon powder, MgCO 3 5% powder, and the balance is magnesium alloy No. 2 flux.

[0036] Wrap the preformed powder with aluminum foil, place it in an intermediate frequency furnace preheated to 750±10°C, pour aluminum melt at a temperature of 750°C into the intermediate frequency furnace to cover the preformed powder, and the preformed powder accounts for 10% of the total weight of the aluminum melt ; Apply an intermediate frequency magnetic field to the prefabricated powder and aluminum solution through an intermediate frequency furnace, and heat it at 950°C for 30 minutes. After the heat preservation, the reaction material is poured into an ingot to prepare a magnesium alloy grain re...

Embodiment 2

[0041] Aluminum powder, carbon powder, MgCO with a particle size of 50-400 mesh 3 Mix the powder and magnesium alloy No. 2 flux uniformly with a ball mill, and then dry it at 300°C for 1 hour to make a prefabricated powder. The weight percentage of each component is 45% of aluminum powder, 5% of carbon powder, MgCO 3 Powder 15%, the balance is magnesium alloy No. 2 flux.

[0042] Wrap the preformed powder with aluminum foil, place it in an intermediate frequency furnace preheated to 750±10°C, pour aluminum melt at a temperature of 800°C into the intermediate frequency furnace to cover the preformed powder, and the preformed powder accounts for 2% of the total weight of the aluminum melt ; Apply an intermediate frequency magnetic field to the prefabricated powder and aluminum solution through an intermediate frequency furnace, and heat it at 900 ° C for 50 minutes. After the heat preservation, the reaction material is poured into an ingot to prepare a magnesium alloy grain refi...

Embodiment 3

[0046] Aluminum powder, carbon powder, MgCO with a particle size of 50-400 mesh 3 Mix the powder and magnesium alloy No. 2 flux evenly with a ball mill, and then dry it at 200°C for 3 hours to make a prefabricated powder. The weight percentage of each component is 40% aluminum powder, 10% carbon powder, MgCO 3 10% powder, and the balance is magnesium alloy No. 2 flux.

[0047] Wrap the preformed powder with aluminum foil, place it in an intermediate frequency furnace preheated to 750±10°C, pour aluminum melt at a temperature of 850°C into the intermediate frequency furnace to cover the preformed powder, and the preformed powder accounts for 5% of the total weight of the aluminum melt ; Apply an intermediate frequency magnetic field to the prefabricated powder and aluminum solution through an intermediate frequency furnace, and keep it warm at 850°C for 40 minutes. After the heat preservation, the reaction material is poured into an ingot to prepare a magnesium alloy grain refi...

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Abstract

The invention discloses a grain refiner for magnesium alloy and a preparation method thereof. The grain refiner comprises the components in percentage by weight: 95 to 98 percent of Al, 2 to 5 percent of C and less than or equal to 0.2 percent of impurities. The preparation method comprises the following steps of: mixing aluminum powder, carbon powder, MgCO3 powder and a magnesium alloy NO.2 solvent uniformly by using a ball mill, drying to prepare preformed powder, preheating an intermediate frequency furnace, packing the preformed powder by using an aluminum foil, placing the pack in the intermediate frequency furnace, pouring aluminum solution to cover the preformed powder, and heating the reaction materials by applying an intermediate frequency magnetic field to make the aluminum solution form stable forced convection; and after keeping the temperature, casting the reaction materials into an ingot to prepare the grain refiner for the magnesium alloy. The method has the advantages of adequate reaction, high carbon yield, enlargement of production scale and suitability for industrial production.

Description

technical field [0001] The invention relates to a grain refiner and a preparation method thereof, in particular to a grain refiner for magnesium alloys and a preparation method thereof. Background technique [0002] Magnesium alloy is light in weight, high in specific strength and specific stiffness, and good in damping and vibration reduction. It is known as the "green" alloy in the 21st century; with the development goals of industrial lightweight and energy saving, it is widely used in automobiles, electronics, military and Applications in the aerospace industry are increasingly widespread. However, due to the close-packed hexagonal structure of magnesium alloys, magnesium alloys have low room temperature plasticity and low formability, which limits the popularization and application of deformed magnesium alloys. Grain refinement is currently an effective method to improve the mechanical properties and formability of subsequent processing of magnesium alloys (especially ...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/05
Inventor 崔建忠高声远乐启炽张志强
Owner NORTHEASTERN UNIV
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