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Aluminum-magnesium-yttrium intermediate alloy prepared by magnesiothermic reduction method and preparation method of aluminum-magnesium-yttrium intermediate alloy

A technology of master alloy and reduction method, applied in the field of rare earth aluminum master alloy, can solve the problems of inability to show alloying effect, many impurities and high cost

Active Publication Date: 2021-09-10
GUILIN UNIVERSITY OF TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high melting point and chemical activity of yttrium, its elemental metal must be obtained by reduction of metal calcium or metal magnesium using yttrium fluoride in a vacuum environment. The production process is long and the cost is high, resulting in a high price of metal yttrium.
In addition, in the metal pair mixing process, due to the large difference in the melting point and density of aluminum and yttrium, it is difficult to mix evenly, and it is also necessary to melt at a temperature not lower than 1000 ° C, and the burning loss of aluminum is serious. Introduced more impurities
Due to the high smelting temperature of this method, the intermetallic compound Al3Y particles produced are relatively large and unevenly distributed, resulting in the inability to exhibit effective alloying effects during the preparation of aluminum alloy materials. It is also unable to give full play to the performance-enhancing effect of Y

Method used

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  • Aluminum-magnesium-yttrium intermediate alloy prepared by magnesiothermic reduction method and preparation method of aluminum-magnesium-yttrium intermediate alloy
  • Aluminum-magnesium-yttrium intermediate alloy prepared by magnesiothermic reduction method and preparation method of aluminum-magnesium-yttrium intermediate alloy
  • Aluminum-magnesium-yttrium intermediate alloy prepared by magnesiothermic reduction method and preparation method of aluminum-magnesium-yttrium intermediate alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing aluminum-magnesium-yttrium master alloy by magnestic reduction method comprises the following steps:

[0039] (1) Calculate and weigh metal aluminum, metal magnesium, yttrium fluoride, lithium fluoride, sodium fluoride, sodium chloride, Potassium chloride, calcium fluoride, magnesium fluoride, aluminum fluoride, spare;

[0040] (2) The mass percent of each component in the mixed salt is: lithium fluoride 10%, sodium fluoride 15%, sodium chloride 20%, potassium chloride 30%, calcium fluoride 5%, magnesium fluoride 8%, Aluminum fluoride 12%, use mixing equipment to mix it evenly; the consumption of described mixed salt is 4 times of yttrium fluoride weight;

[0041] (3) Put metal aluminum in an aluminum alloy melting furnace and heat up to 740°C to melt, add metal magnesium in proportion and keep it warm to make it melt completely, add the prepared mixed salt in proportion and heat up to 850°C, and the mixed salt is completely melted, get melt 1; ...

Embodiment 2

[0047] A method for preparing aluminum-magnesium-yttrium master alloy by magnestic reduction method comprises the following steps:

[0048] (1) Calculate and weigh metal aluminum, metal magnesium, and yttrium compounds (yttrium fluoride, yttrium chloride), sodium fluoride, and , potassium fluoride, sodium chloride, potassium chloride, magnesium fluoride, aluminum fluoride, spare;

[0049] (2) The mass percentages of each component in the compound of yttrium are: 40% of yttrium fluoride, 60% of yttrium chloride, which are mixed uniformly and set aside;

[0050] (3) The mass percent of each component in the mixed salt is: sodium fluoride 15%, potassium fluoride 10%, sodium chloride 30%, potassium chloride 30%, magnesium fluoride 10%, aluminum fluoride 5%, Use mixing equipment to mix it evenly; the amount of mixed salt is 5 times that of the compound of yttrium;

[0051] (4) Put metal aluminum in an aluminum alloy melting furnace and heat up to 740°C to melt, add metal magnesiu...

Embodiment 3

[0056] A method for preparing aluminum-magnesium-yttrium master alloy by magnestic reduction method comprises the following steps:

[0057] (1) Calculate and weigh metal aluminum, metal magnesium, yttrium compounds (yttrium chloride, yttrium bromide), lithium fluoride, and , sodium fluoride, sodium chloride, potassium chloride, sodium bromide, potassium iodide, magnesium fluoride, aluminum fluoride;

[0058] (2) The mass percentages of each component in the compound of yttrium are: 70% of yttrium chloride, 30% of yttrium bromide, which are mixed uniformly and set aside;

[0059] (3) The mass percentage of each component in the mixed salt is: lithium fluoride 10%, sodium fluoride 15%, sodium chloride 20%, potassium chloride 25%, sodium bromide 8%, potassium iodide 8%, fluoride Magnesium 5%, aluminum fluoride 9%, use mixing equipment to mix them evenly; the amount of mixed salt is 3 times that of yttrium compound;

[0060] (4) Put the metal aluminum into an aluminum alloy melt...

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Abstract

The invention provides an aluminum-magnesium-yttrium intermediate alloy prepared by a magnesiothermic reduction method and a preparation method of the aluminum-magnesium-yttrium intermediate alloy, and belongs to the technical field of rare earth aluminum intermediate alloys, the aluminum-magnesium-yttrium intermediate alloy comprises metal aluminum, metal magnesium, a yttrium compound, alkali metal fluoride, alkali metal fluoride, alkaline earth metal fluoride and aluminum fluoride. Firstly, the metal aluminum is put into an aluminum alloy smelting furnace to be heated and melted, and the metal magnesium is added in proportion after melting; after the metal magnesium is completely melted, mixed salt is added in proportion, and heating and heat preservation are conducted to completely melt the mixture; the yttrium compound is added in proportion, the temperature is kept at 950-1150 DEG C, and the melt is continuously mechanically stirred during the period; after the reaction is completed, argon is introduced into the melt for refining, and slagging-off operation is conducted; and finally, casting is conducted to obtain an aluminum-magnesium-yttrium intermediate alloy ingot. The yield of yttrium is high, and the prepared aluminum-magnesium-yttrium intermediate alloy is uniform in yttrium content, few in impurities and low in preparation cost.

Description

technical field [0001] The invention relates to the technical field of rare earth aluminum master alloys, in particular to an aluminum magnesium yttrium master alloy prepared by a magnesia thermal reduction method and a preparation method thereof. Background technique [0002] Yttrium (Y) is one of the rare earth elements. Adding a small amount of yttrium to aluminum alloy can show the effect of refining grains, increasing the recrystallization temperature, and improving the normal temperature mechanical properties, high temperature mechanical properties, corrosion resistance and welding properties of aluminum alloy materials. performance. Y can form an Al with Al element in the aluminum alloy system 3 The intermetallic compound of Y, which can be the first to crystallize and precipitate during the casting process of aluminum alloy, promote the nucleation of α-Al, and refine the as-cast aluminum alloy grains. The Y element can also modify the Fe-rich and Si-rich phases in ...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/03C22C21/00C22C21/06C22C21/08
CPCC22C1/026C22C1/03C22C21/00C22C21/06C22C21/08
Inventor 胡振光冀军宇韦德仕葛富彪秦丽娟吴顺意何俞松
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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