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Method for preparing magnesium samarium intermediate alloy with high-intensity ultrasound

A high-energy ultrasonic and master alloy technology is applied in the field of high-energy ultrasonic preparation of magnesium-samarium master alloys, which can solve the problems of easy oxidation, removal, and high melting point, and achieve the effects of stable content, reduced component segregation, and simple process.

Inactive Publication Date: 2012-11-14
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the chemical properties of rare earth elements are very active, when they are directly added to the alloy in the form of simple rare earth or mixed rare earth, it has the following disadvantages: first, it is easy to oxidize, and the scale needs to be removed before adding it to the magnesium alloy melt; secondly, the melting point of rare earth elements is relatively low. High, through physical diffusion or chemical reaction, it will gradually dissolve in the alloy after being added to the magnesium alloy melt

Method used

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  • Method for preparing magnesium samarium intermediate alloy with high-intensity ultrasound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: First, put the pure magnesium ingot into the crucible and heat it to melt, wrap the rare earth samarium particles with a diameter of 20-100um (the purity of Sm is 99.9%) with aluminum foil, and add it to the above pure magnesium melt. The mass of rare earth samarium in the melt accounted for 40% of the total weight, and then kept at 731 °C for 31 min. Extend the ultrasonic horn into the melt for intermittent ultrasonic treatment with an ultrasonic intensity of 1.01kw / cm 2 , the ultrasonic time is 26, the application time of high-energy ultrasonic is 21 s each time, and the intermittent time is 21 s. Refining and removing impurities at 731°C, casting and sampling.

Embodiment 2

[0009] Example 2: First put the pure magnesium ingot into the crucible and heat it to melt, wrap the powdered rare earth samarium (the purity of Sm is 99.9%) with aluminum foil, add it to the above pure magnesium melt, the rare earth samarium in the alloy melt The mass accounted for 40% of the total weight, and then kept at 733 °C for 33 min. Extend the ultrasonic horn into the melt for intermittent ultrasonic treatment with an ultrasonic intensity of 1.05kw / cm 2 , the ultrasonic time was 28 min, the application time of high-energy ultrasonic was 23 s each time, and the interval time was 23 s. Refining and removing impurities at 733°C, casting and sampling.

Embodiment 3

[0010] Embodiment 3: first put the pure magnesium ingot into the crucible and heat it to melt, then wrap the powdered rare earth samarium (the purity of Sm is 99.9%) with a mass fraction of 40% in aluminum foil, and add it to the above pure magnesium melt, The mass of rare earth samarium in the alloy melt accounts for 40% of the total weight, and then it is kept at 735°C for 35 min. Extend the ultrasonic horn into the melt for intermittent ultrasonic treatment with an ultrasonic intensity of 1.1 kw / cm 2 , the ultrasonic time was 30 min, the high-energy ultrasonic was applied for 25 s each time, and the intermittent time was 25 s. Refining and removing impurities at 735°C, casting and sampling.

[0011] attached figure 1 This is the metallographic diagram of the microstructure of the magnesium-samarium master alloy obtained in Example 3. It can be seen from the figure that the eutectic structure of the obtained magnesium-samarium master alloy structure is very uniform and the...

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Abstract

The invention provides a method for preparing magnesium samarium intermediate alloy with high-intensity ultrasound. The method comprises the following steps: 1) heating to melt pure magnesium ingot in a crucible, wrapping rare earth samarium through a piece of aluminized paper, and adding to the pure magnesium melt, and preserving the temperature for 31 to 35 minutes within 731 to 735 DEG C; 2) extending an ultrasonic amplitude transformer into the melt to perform ultrasonic treatment in an intermittent mode for 26 to 30 minutes along with ultrasound intensity of 1.01 to 1.1 kw / cm<2>, wherein the high-intensity ultrasound is carried out for 21 to 25 seconds each time, with the intermitting time being 21 to 25 seconds; and 3) refining and removing the impurity at 731 to 735 DEG C, and casting and sampling. The magnesium samarium intermediate alloy prepared by the method has the advantages that the content is stable, and the rare earth can be avoided being burned effectively, and can reduce the oxide inclusion and composition segregation can be reduced, and the like; and the method is simple in technology, and is safe and reliable, and convenient to operate.

Description

technical field [0001] The invention relates to a metal preparation method, in particular to a method for preparing a magnesium-samarium master alloy by using high-energy ultrasound. Background technique [0002] The alloying or microalloying effect of rare earth elements in magnesium alloys has achieved more and more remarkable results. Taking advantage of a series of advantages of rare earth elements, such as grain refinement and melt purification, many scholars have developed many rare earth magnesium alloys on this basis, which have excellent strength, good creep resistance, and strong corrosion resistance. Performance, thus meeting the requirements of magnesium alloys in many fields. Therefore, the deepening of a series of theories such as the strengthening principle of rare earths in magnesium alloys and the mechanism of action on microstructures will help improve the economic benefits of magnesium alloy products in my country and further consolidate the status of my...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C23/06C22C1/02
Inventor 闫洪施新民杜磊胡志
Owner NANCHANG UNIV
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