Method for preparing magnesium-lanthanum master alloy by high-intensity ultrasound

A master alloy and high-energy ultrasonic technology, which is applied in the field of preparation of magnesium-lanthanum master alloy, can solve the problems of difficult control of alloy composition, harm to human health, and generation of toxic gas, and achieve the effects of avoiding rare earth burning loss, convenient operation, and reducing oxidation inclusions

Inactive Publication Date: 2011-10-19
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its advantage is that it can produce a master alloy with a higher content of magnesium-rare earth, but it will produce toxic gas during the electrolysis proc

Method used

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  • Method for preparing magnesium-lanthanum master alloy by high-intensity ultrasound
  • Method for preparing magnesium-lanthanum master alloy by high-intensity ultrasound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Implementation Example 1: First, put the pure magnesium ingot into the crucible and heat it to melt, then wrap the powdered rare earth lanthanum (the purity of La is 99.9%) with a mass fraction of 15% in aluminum foil, and add it to the above pure magnesium melt, It was then incubated at 700°C for 30 minutes. Extend the ultrasonic horn into the melt for ultrasonic treatment. Ultrasonic for 30 minutes, the ultrasonic power is 800W, refining and removing impurities at 700°C, casting and sampling.

Embodiment 2

[0011] Implementation Example 2: First put the pure magnesium ingot into the crucible and heat it to melt, then wrap the powdered rare earth lanthanum (the purity of La is 99.9%) with a mass fraction of 15% and add it to the above pure magnesium melt, It was then incubated at 710°C for 25 minutes. Extend the ultrasonic horn into the melt for ultrasonic treatment. Ultrasonic for 40 minutes, the ultrasonic power is 600W, refining and removing impurities at 710°C, casting and sampling.

Embodiment 3

[0012] Implementation example 3: first put the pure magnesium ingot into the crucible and heat it to melt, then wrap the powdered rare earth lanthanum (the purity of La is 99.9%) with a mass fraction of 15% and add it to the above pure magnesium melt, It was then incubated at 720°C for 20 minutes. Extend the ultrasonic horn into the melt for ultrasonic treatment. Ultrasonic for 45 minutes, the ultrasonic power is 400W, refining and removing impurities at 720°C, casting and sampling.

[0013] Such as figure 1 As shown, the eutectic structure of the Mg-La master alloy obtained under the conditions of Example 2 is very uniform in distribution and round in shape. When ultrasonic waves are introduced into alloy melts, there will be many nonlinear effects in the propagation of sound waves, among which the main performance is cavitation and acoustic flow effects, stirring, dispersion, impact damage and thermal effects in the mechanical effects caused by cavitation and acoustic flow...

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Abstract

The invention discloses a method for preparing a magnesium-lanthanum master alloy by high-intensity ultrasound. The method includes the steps as follows: firstly placing a pure magnesium ingot in a crucible and heating the pure magnesium ingot to melt; wrapping powdered rare earth lanthanum with aluminum-foil paper and adding the wrapped rare earth lanthanum in the pure magnesium melt; then keeping temperature for 20-30 minutes within the range of 700-720 DEG C; putting an ultrasonic amplitude transformer bar into the melt to conduct ultrasound processing for 30-45 minutes, wherein the power of ultrasound is 400-800W; and conducting refining and decontaminating within the temperature range as above and then conducting casting and sampling. The technical effects are as follows: the magnesium-lanthanum master alloy obtained by the method has the advantages of being stable in content, effectively avoiding burning loss of rare earth, reducing oxide inclusion and composition segregation, and the like; in addition, the technology is simple, safe and reliable, and convenient to operate.

Description

technical field [0001] The invention relates to a method for preparing a magnesium-lanthanum master alloy, in particular to a method for preparing a magnesium-lanthanum master alloy with high-energy ultrasound. Background technique [0002] Rare earths are mostly added as trace elements in magnesium alloys and other alloys. Because rare earth elements have high chemical activity and high melting point, they are easy to oxidize and burn at high temperatures. In order to improve the accuracy of the composition of rare earth elements in magnesium alloys so that they can be dissolved into magnesium alloys at a lower melting temperature, rare earth elements are mostly added in the form of master alloys in magnesium alloys. In the long-term research, people continue to explore the preparation methods of magnesium-rare earth master alloys. At present, the production methods of rare earth magnesium alloys can be roughly summarized as follows: [0003] Direct fusion method: the rare...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C23/00
Inventor 闫洪杜磊胡志闫思聪
Owner NANCHANG UNIV
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