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Method for preparing aluminum cerium intermediate alloy through high-intensity ultrasound

A high-energy ultrasonic and master alloy technology, which is applied in the field of high-energy ultrasonic preparation of aluminum-cerium 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: 2013-02-06
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 aluminum cerium intermediate alloy through high-intensity ultrasound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: First put the pure aluminum ingot into the crucible and heat it to melt, then wrap the rare earth cerium (Ce purity is 99.9%) particles with a diameter of 20-100um in aluminum foil and press them into the above pure aluminum melt, Then it was kept at 725°C for 20 minutes, and the rare earth cerium content was 18% of the total weight. Extend the ultrasonic horn into 8mm below the melt surface to apply intermittent high-energy ultrasonic with an ultrasonic intensity of 0.6kw / cm 2 , the application time is 8min, the application time of high-energy ultrasound is 30 seconds each time, and the intermittent time is 30 seconds. Refining and removing impurities at 700°C, casting and sampling.

Embodiment 2

[0015] Example 2: First put the pure aluminum ingot into the crucible and heat it to melt, then wrap the rare earth cerium (Ce purity is 99.9%) particles with a diameter of 20-100um in aluminum foil and press them into the above pure aluminum melt, Then keep it warm at 735°C for 30 minutes, wherein the rare earth cerium content is 18% of the total weight. Extend the ultrasonic horn into 12mm below the melt surface to apply intermittent high-energy ultrasonic with an ultrasonic intensity of 0.8kw / cm 2 , the application time is 12min, the application time of high-energy ultrasound is 40 seconds each time, and the intermittent time is 40 seconds. Refining and removing impurities at 700°C, casting and sampling.

Embodiment 3

[0016] Example 3: First put the pure aluminum ingot into the crucible and heat it to melt, wrap the rare earth cerium (Ce purity is 99.9%) particles with a diameter of 20-100um in aluminum foil, and press them into the above pure aluminum melt, Then it was kept at 745°C for 30 minutes, and the rare earth cerium content was 18% of the total weight. Extend the ultrasonic horn into 15mm below the melt surface to apply intermittent high-energy ultrasonic with an ultrasonic intensity of 0.8kw / cm 2 , the application time is 15min, the application time of high-energy ultrasound is 50 seconds each time, and the intermittent time is 50 seconds, refining and removing impurities at 710°C, casting and sampling.

[0017] From attached figure 1 It can be seen that the eutectic structure of the obtained aluminum-cerium master alloy is very uniform. When ultrasonic waves are introduced into the alloy melt, there will be many nonlinear effects in the propagation of sound waves, mainly manife...

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Abstract

A method for preparing aluminum cerium intermediate alloy through high-intensity ultrasound comprises the following steps of: (1) placing pure aluminum ingots in a crucible for heating to melt, wrapping rare earth cerium particles in the diameter of 20-100mu m by using aluminized paper, pressing in the pure aluminum melt, keeping warm for 20-30 minutes at the temperature of 725DEG C-745 DEG C, and enabling the rare earth cerium content to be 18% of the total weight; (2) stretching a ultrasonic amplitude transformer in a position which is 8-15mm away from a liquid level of alloy melt to conduct batch-type high-intensity ultrasound and enabling ultrasound intensity to be 0.6kw / cm<2>-0.8 kw / cm<2>; (3) enabling ultrasound execution time to be 8-15 minutes, enabling each time of high-intensity ultrasound execution time to be 30-50s, and enabling rest time to be 30-50s; and (4) cooling the alloy melt to 700DEG C-710 DEG C for refining and impurity removing, and conducting pouring. The method is low in melting temperature, capable of effectively avoiding burning loss of rare earth, stable in rare earth content, low in energy consumption, simple in process, safe, reliable and uniform in alloy content and reduces 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-cerium 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 disadva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/00C22C1/02
Inventor 闫洪华群饶远生胡志
Owner NANCHANG UNIV
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