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Method for preparing magnesium-gadolinium intermediate alloy by using high-intensity ultrasound

A high-energy ultrasonic, master alloy technology, applied in the field of rare earth master alloy, can solve the problems of high melting point, removal, easy oxidation, etc., and achieve the effects of simple process, convenient operation and stable content

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-gadolinium intermediate alloy by using high-intensity ultrasound

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Example 1. First, put the pure magnesium ingot into the crucible and heat it to melt, then wrap the powdery rare earth gadolinium (the purity of Gd is 99.9%) with aluminum foil, and add it to the above pure magnesium melt, wherein the rare earth gadolinium accounts for 2% of the total mass. 30%, and then incubated at 736°C for 36 min. Extend the ultrasonic horn into the melt for intermittent ultrasonic treatment with an ultrasonic intensity of 1.11kw / cm 2 , the ultrasonic time was 46 min, the application time of high-energy ultrasonic was 51 s each time, and the intermittent time was 51 s. Refining and removing impurities at 736°C, casting and sampling.

Embodiment 2

[0012] Example 2: First put the pure magnesium ingot into the crucible and heat it to melt, then wrap the rare earth gadolinium particles with a diameter of 20-100um (the purity of Gd is 99.9%) with aluminum foil, and add it to the above pure magnesium melt, in which the rare earth Gadolinium accounted for 30% of the total mass, and then incubated at 738°C for 38 min. Extend the ultrasonic horn into the melt for intermittent ultrasonic treatment with an ultrasonic intensity of 1.15kw / cm 2 , the ultrasonic time was 48 min, the application time of high-energy ultrasonic was 55 s each time, and the intermittent time was 55 s. Refining and removing impurities at 738°C, casting and sampling.

Embodiment 3

[0013] Example 3: First put the pure magnesium ingot into the crucible and heat it to melt, then wrap the powdered rare earth gadolinium (the purity of Gd is 99.9%) with aluminum foil, and add it to the above pure magnesium melt, wherein the rare earth gadolinium accounts for the total mass 30% of that, and then incubated at 740°C for 40 min. Extend the ultrasonic horn into the melt for intermittent ultrasonic treatment with an ultrasonic intensity of 1.2 kw / cm 2 , the ultrasonic time was 50 min, the high-energy ultrasonic was applied for 60 s each time, and the intermittent time was 60 s. Refining and removing impurities at 740°C, casting and sampling.

[0014] attached figure 1 This is the metallographic diagram of the microstructure of the magnesium-gadolinium master alloy obtained in Example 3. It can be seen from the figure that the eutectic structure of the obtained magnesium-gadolinium master alloy structure is very uniform and the shape is also very round. When ultr...

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Abstract

A method for preparing magnesium-gadolinium intermediate alloy by using high-intensity ultrasound comprises the following steps: 1) firstly placing pure magnesium ingot into a crucible, heating to be molten, coating rare earth gadolinium with aluminum-foil paper, adding in the pure magnesium melt, and preserving heat at a range of 736-740 DEG C for 36-40min to obtain alloy melt; 2) extending an ultrasound amplitude transformer into the alloy melt for carrying out intermittent type ultrasound treatment, wherein the ultrasound strength is 1.11kw / cm<2>-1.2 kw / cm<2>, the ultrasound time lasts 46-50min, applying time of the high-intensity ultrasound at each time lasts 51-60s, and the intermittence time lasts 51-60s; and 3) refining and purifying at temperature range of 736-740 DEG C, casting and sampling. The magnesium-gadolinium intermediate alloy prepared by using the method has the advantages of being stable in content, capable of effectively avoiding burning loss of the rare earth, and reducing oxidized inclusions, composition segregation and the like, and is simple in process, safe and reliable and convenient to operate.

Description

technical field [0001] The invention relates to a method for a rare-earth master alloy, in particular to a method for preparing a magnesium-gadolinium master alloy with 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 sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C23/06C22C1/02
Inventor 闫洪杜磊阮先明
Owner NANCHANG UNIV
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