Method for preparing aluminum-yttrium intermediate alloy by using high intensity ultrasonic

A high-energy ultrasonic and master alloy technology, which is applied in the field of high-energy ultrasonic preparation of aluminum-yttrium master alloy, can solve the problems of difficult control of alloy composition, harm to human health, large fluctuation range, etc., 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

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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-yttrium intermediate alloy by using high intensity ultrasonic

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, wrap the rare earth yttrium particles with a diameter of 20-100um in aluminum foil, press them into the above pure aluminum melt, and keep it warm at 725°C for 30 minutes, wherein The content of the rare earth yttrium accounts for 10% of the total weight, and the purity of the rare earth yttrium is 99.9%. Apply intermittent high-energy ultrasound at a place 10mm below the surface of the above alloy melt, with an ultrasound intensity of 0.3kw / 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

[0015] Example 2: First put the pure aluminum ingot into the crucible and heat it to melt, wrap the rare earth yttrium particles with a diameter of 20-100um in aluminum foil, press them into the above pure aluminum melt, and keep it warm at 735°C for 40 minutes, wherein The content of the rare earth yttrium accounts for 15% of the total weight, and the purity of the rare earth yttrium is 99.9%. Apply intermittent high-energy ultrasound at a place 15mm below the surface of the alloy melt, with an ultrasound intensity of 0.4kw / 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

[0016] Example 3: First put the pure aluminum ingot into the crucible and heat it to melt, wrap the rare earth yttrium 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 40 minutes, wherein The content of the rare earth yttrium accounts for 10% of the total weight, and the purity of the rare earth yttrium is 99.9%. Apply intermittent high-energy ultrasound at a place 15mm below the surface of the alloy melt, with an ultrasound intensity of 0.5kw / 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.

[0017] It can be seen that the eutectic structure of the obtained aluminum-yttrium master alloy structure is very uniform. When ultrasonic waves are introduced into the alloy melt, there will be many nonlinea...

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Abstract

A method for preparing an aluminum-yttrium intermediate alloy by using high intensity ultrasonic comprises the following steps of: (1) firstly, putting a pure alumium ingot in a crucible and heating until the pure alumium ingot is melted, covering rare earth yttrium particles having the diameter of 20-100 microns with aluminium-foil paper and pressing the rare earth yttrium particles into the pure alumium melt, and preserving heat for 30-40 minutes at a temperature of 725-745 DEG C, wherein the content of the rare earth yttrium is 10-15% of the total weight; (2) applying intermittent high intensity ultrasonic at the place away from 10-15 mm under the liquid level of the alloy melt, wherein the intensity of the ultrasonic is 0.3-0.5 kw/cm<2>; (3) applying the ultrasonic for 8-15 minutes in total, wherein the time of applying the high intensity ultrasonic each time is 30-50 seconds and the intermittent time is 30-50 seconds; and (4) reducing the temperature of the alloy melt to 700-710 DEG C for refining and impurity removal and then performing casting. The method provided by the invention is capable of effectively avoiding the burning loss of the rare earth, stable in rare earth content and low in energy consumption. Besides, the method is simple in process, safe and reliable, convenient to operate, and capable of guaranteeing even alloy components and reducing 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-yttrium 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): C22C21/00C22C1/02
Inventor 闫洪陈华军黄兴胡志
Owner NANCHANG UNIV
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