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Method for preparing aluminum-holmium intermediate alloy by virtue of high-energy ultrasonic

A high-energy ultrasonic and master alloy technology, which is applied in the field of high-energy ultrasonic preparation of aluminum-holmium master alloy, 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: 2014-01-29
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-holmium intermediate alloy by virtue of high-energy 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 holmium particles with a diameter of 20-100um in aluminum foil, and press them into the above pure aluminum melt, wherein the purity of the rare earth holmium is 99.9%. Insulate at 765°C for 30 minutes, wherein the rare earth holmium content accounts for 10% of the total weight. Apply intermittent high-energy ultrasound at a place 10mm below the surface of the above alloy melt, with an ultrasound intensity of 0.6kw / 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 holmium particles with aluminum foil, press them into the above pure aluminum melt, wherein the purity of the rare earth holmium is 99.9%, and keep it at 775°C for 40 Minutes, wherein the rare earth holmium content accounts for 10% of the total weight. Apply intermittent high-energy ultrasound at a place 15mm below the surface of the alloy melt, with an ultrasound intensity of 0.8kw / 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 holmium powder with aluminum foil, press it into the above pure aluminum melt, wherein the purity of the rare earth holmium is 99.9%, and keep it at 785°C for 40 Minutes, wherein the rare earth holmium content accounts for 10% of the total weight. Apply intermittent high-energy ultrasound at a place 15mm below the surface of the alloy melt, with an ultrasound intensity of 0.8kw / 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] attached figure 1 It is the metallographic diagram of the eutectic structure of the aluminum holmium master alloy structure that embodiment 2 obtains, by appending figure 1 It can be seen that the distribution of the eutectic structure of ...

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Abstract

The invention provides a method for preparing an aluminum-holmium intermediate alloy by virtue of high-energy ultrasonic. The method comprises the following steps of: (1) putting a pure aluminum ingot into a crucible for heating until melting, covering rare earth holmium with aluminum foil paper and pressing the covered rare earth holmium into the pure aluminum melt, and preserving heat within the range from 765 to 785 DEG C for 30-40 minutes, wherein the content of the rare earth holmium is 10% of the total weight; (2) applying intermittent high-energy ultrasonic 10-15 mm under the liquid level of the alloy melt, wherein the intensity of the ultrasonic ranges from 0.6 kw / cm<2> to 0.8 kw / cm<2>, the applying time of the high-energy ultrasonic is 8-15 min, the applying time of each time is 30-50 seconds and the interval time is 30-50 seconds; (3) next, reducing the temperature of the alloy melt to the range from 700 to 710 DEG C for refining and impurity removal, and casting. The method provided by the invention is capable of effectively avoiding rare earth burning loss due to low melting temperature, so that the content of the rare earth is stable and the energy consumption is reduced. Besides, the method is simple in process, safe and reliable and convenient to operate.

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-holmdium 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: the rare earth or mixed rare earth metals are mixed in a certain proportion Add it to high-temperature molten aluminum to make an intermediate alloy. It is characterized by convenient operation and stable alloy composition content. T...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/02C22C1/06
Inventor 闫洪黄兴阮先明胡志
Owner NANCHANG UNIV
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