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Method for preparing aluminium praseodymium intermediate alloy in high-energy ultrasonic mode

A high-energy ultrasonic and master alloy technology, which is applied in the field of high-energy ultrasonic preparation of aluminum-praseodymium master alloys, can solve the problems of difficult control of alloy composition, harm to human health, and large fluctuation range, and achieve stable rare earth content, convenient operation, and reduced energy consumption. Effect

Inactive Publication Date: 2013-04-17
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of electrolysis, toxic gases will be produced, which will pollute the environment and endanger human health.
In addition, the alloy composition is difficult to control and has a large fluctuation range

Method used

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  • Method for preparing aluminium praseodymium intermediate alloy in high-energy ultrasonic mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: First put the pure aluminum ingot into the crucible and heat it to melt, wrap the rare earth praseodymium particles with a diameter of 20-100um in aluminum foil, press them into the above pure aluminum melt, and keep it warm at 745°C for 30 minutes, in which the rare earth The praseodymium content accounts for 20% of the total weight; the purity of the rare earth praseodymium is 99.9%. Apply intermittent high-energy ultrasound at a place 10mm below the liquid surface of the above-mentioned alloy melt, and the ultrasonic intensity is 0.5kw / cm 2 , the application time is 8min, the high-energy ultrasonic is applied for 30 seconds each time, and the intermittent time is 30 seconds, and then the alloy melt is lowered to 700°C for refining and impurity removal and casting.

Embodiment 2

[0013] Example 2: First, put the pure aluminum ingot into the crucible and heat it to melt, wrap the rare earth praseodymium particles with a diameter of 20-100um in aluminum foil, press them into the above pure aluminum melt, and keep it warm at 755°C for 40 minutes. The content of praseodymium accounts for 25% of the total weight; the purity of the rare earth praseodymium is 99.9%. Apply intermittent high-energy ultrasound at a place 15mm below the surface of the alloy melt, with an ultrasound intensity of 0.6kw / cm 2 , the application time is 12min, the high-energy ultrasonic is applied for 40 seconds each time, and the intermittent time is 40 seconds, and then the alloy melt is lowered to 710°C for refining and impurity removal and casting.

Embodiment 3

[0014] Example 3: First, put the pure aluminum ingot into the crucible and heat it to melt, wrap the rare earth praseodymium particles with a diameter of 20-100um in aluminum foil, press them into the above pure aluminum melt, and keep it warm at 765°C for 40 minutes, in which the rare earth The praseodymium content accounts for 20% of the total weight; the purity of the rare earth praseodymium is 99.9%. Apply intermittent high-energy ultrasound at a place 15mm below the surface of the alloy melt, with an ultrasound intensity of 0.7kw / cm 2 , the application time is 15 minutes, the application time of high-energy ultrasonic is 50 seconds each time, and the intermittent time is 50 seconds, and then the alloy melt is lowered to 710 ° C for refining and impurity removal and casting.

[0015] It can be seen that the distribution of the eutectic structure of the aluminum-praseodymium master alloy is very uniform. When ultrasonic waves are introduced into the alloy melt, there will ...

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Abstract

The invention discloses a method for preparing an aluminium praseodymium intermediate alloy in a high-energy ultrasonic mode. The method comprises the following steps of: (1) putting a pure aluminium ingot into a crucible to heat until the pure aluminium ingot is molten, coating rare-earth praseodymium particles by using an aluminium paper and pressing the rare-earth praseodymium particles into a pure aluminium melt to preserving the temperature for 30-40 minutes in the range of 745-765 DEG C, wherein the content of the rare-earth praseodymium occupies 20-25 percent of the total weight; (2) applying interval high-energy ultrasonic on a part which is at a distance of 10-15mm away from the lower part of the liquid surface of the alloy melt, wherein the ultrasonic intensity is 0.5kw / cm<2>-0.7kw / cm<2>, wherein the ultrasonic application time is 8-15 minutes, the application time of the high-energy ultrasonic every time is 30-50 seconds, and the interval time is 30-50 seconds; and (3) reducing the temperature of the alloy melt to be 700-710 DEG C, refining, removing impurities and pouring. The method is relatively low in melting temperature, stable in rare-earth content, simple in process, safe and reliable, convenient to operate and uniform in obtained alloy components, and reduces energy consumption and segregation.

Description

technical field [0001] The invention relates to a preparation method of a rare earth alloy, in particular to a method for preparing an aluminum-praseodymium master alloy by high-energy ultrasound. Background technique [0002] Aluminum-rare-earth master alloy is an efficient refinement modifier with good refinement and modification effect. It is widely used in the refinement and modification of aluminum and its alloys. It can significantly refine the alloy structure and improve the mechanical properties of the alloy. In the long-term research, people continue to explore the preparation methods of aluminum-rare earth alloys. At present, the production methods of rare earth aluminum alloys are roughly summarized as follows: 1. Direct fusion method: adding rare earth or mixed rare earth metals in a certain proportion Into the high-temperature aluminum liquid, the master alloy is obtained. It is characterized by convenient operation and stable alloy composition content. The di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/03C22C21/00
Inventor 闫洪黄兴李正华胡志
Owner NANCHANG UNIV
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