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A kind of refining agent for magnesium and magnesium alloy and preparation method thereof

A magnesium alloy and refiner technology, applied in the field of metal materials and metallurgy, can solve the problem of increasing the oxidation burning loss and air intake of magnesium melt, the effect of large-volume melt treatment is not obvious, increasing the consumption of energy and crucible, etc. problems, to achieve the effect of reducing labor intensity and processing costs, convenient and easy access to raw materials, and high cost performance

Active Publication Date: 2016-08-17
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the melt superheating method can play a certain role in refinement, this method increases the oxidation loss and gas absorption of the magnesium melt, and increases the consumption of energy and crucible. Therefore, this method has been very difficult in production. It is rarely used; changing the casting process parameters (such as cooling rate) before pouring or during the casting process can achieve a certain refinement effect in the solidification process, but it only has a refinement effect on the local area of ​​​​the product, and it is difficult to achieve uniformity in the entire volume. Refinement; the refinement method of adding alloy elements can significantly refine the solidification structure of magnesium alloys. At present, the addition of alloys is mainly rare earth elements, but the cost is relatively high. At the same time, new alloy elements will be introduced to affect the alloy composition; The external force (such as strong magnetic field, ultrasonic wave, mechanical stirring, etc.) is mainly applied during the solidification process, and the treatment effect on large-volume melts is not obvious, and it needs to be cooled and solidified as soon as possible after treatment. reduced, short timeliness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The composition of the refining agent and the mass percentages of its components are: 50.0% limestone, 24.0% magnesium chloride, 19.0% potassium chloride, 2.0% barium chloride, 1.5% calcium fluoride, 3.0% fluorite, 0.5% borax.

[0018] Weigh limestone, magnesium chloride, potassium chloride, barium chloride, calcium fluoride, fluorite, and borax according to the above ratio; use a crusher to crush the limestone, fluorite, and borax, and then use a No. 30 sieve to sieve ;Put the crushed limestone, fluorite and borax together with magnesium chloride, potassium chloride, barium chloride and calcium fluoride in a drying oven for baking at 150°C for 1 hour; Magnesium chloride, potassium chloride, barium chloride, and calcium fluoride were melted in a crucible preheated to 500°C. After they were all melted, they were stirred for 20 minutes, then the temperature was raised to 800°C and stirred for 20 minutes, and then poured into the mold after 30 minutes of heat preservation....

Embodiment 2

[0021] The composition of the refining agent and the mass percentages of its components are: 42.0% limestone, 27.0% magnesium chloride, 22.0% potassium chloride, 3.0% barium chloride, 2.0% calcium fluoride, 3.5% fluorite, 0.5% borax.

[0022] Weigh limestone, magnesium chloride, potassium chloride, barium chloride, calcium fluoride, fluorite, and borax according to the above ratio; use a crusher to crush the limestone, fluorite, and borax, and then use a No. 30 sieve to sieve ;Put the crushed limestone, fluorite and borax together with magnesium chloride, potassium chloride, barium chloride and calcium fluoride in a drying oven for baking at 120°C for 2 hours; Put the magnesium chloride, potassium chloride, barium chloride, and calcium fluoride in a crucible preheated to 600°C for melting. After they are all melted, stir for 10 minutes, then let the temperature rise to 800°C and stir for 20 minutes, keep warm for 30 minutes, and then pour into the mold Cool and solidify into ...

Embodiment 3

[0025] The composition of the refining agent and the mass percentage of each component are: 60.0% dolomite, 18.0% magnesium chloride, 16.0% potassium chloride, 2.0% barium chloride, 1.0% calcium fluoride, 2.0% fluorite , 1.0% borax.

[0026] Weigh dolomite, magnesium chloride, potassium chloride, barium chloride, calcium fluoride, fluorite, and borax according to the above ratio; and use a pulverizer to crush dolomite, fluorite, and borax, and then use a No. 40 sieve to Screening; the pulverized dolomite, fluorite and borax and magnesium chloride, potassium chloride, barium chloride and calcium fluoride are put into a drying oven for baking at a temperature of 150°C for 2 hours; The baked magnesium chloride, potassium chloride, barium chloride, and calcium fluoride are melted in a crucible preheated to 550°C. After they are all melted, stir for 15 minutes, then let stand and heat up to 805°C, stir for 20 minutes, and keep warm for 40 minutes. Pour into a mold to cool and solidi...

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Abstract

The invention relates to a refiner for magnesium and magnesium alloy and a preparation method thereof. The refiner is formed by mixing the following components in percentage by mass: 35.0-60.0% of one or more of limestone, dolomite and magnesite, 18.0-28.0% of magnesium chloride, 16.0-24.0% of potassium chloride, 2.0-4.0% of barium chloride, 1.0-3.0% of calcium fluoride, 2.0-5.0% of fluorite and 0.0-1.5% of borax. The refiner has the advantages of accessible raw materials, simple production technique, low cost, long antiaging life and high and stable refinement efficiency, and is convenient for addition.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, and in particular relates to a refiner for magnesium and magnesium alloys and a preparation method thereof. Background technique [0002] Magnesium alloys are widely used in automobiles, communication equipment and It has broad application prospects in the electronics industry. However, the performance of magnesium alloys is relatively low and the formability is poor, which limits the application of magnesium alloys. Grain refinement, as an important means to improve the comprehensive properties of magnesium alloys and improve the formability of magnesium alloys, has been widely concerned and highly valued by people. The influence of grain refinement on the properties of magnesium alloys is mainly reflected in the following aspects: (1) Since magnesium alloys have a close-packed hexagonal crystal structure, there are only three independent slip systems at room temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C23/00
Inventor 张志强刘轩宝磊乐启炽崔建忠
Owner NORTHEASTERN UNIV LIAONING
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