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Method for preparing aluminum scandium alloy through thermal reduction of scandium fluoride

A scandium fluoride and aluminum scandium technology, applied in the field of metal alloys, can solve the problems of difficult control of scandium content, poor production environment and high production cost, and achieve the effects of precise control of scandium composition, high scandium content and low impurity fluorine content

Inactive Publication Date: 2015-06-24
翁国庆 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method for preparing aluminum-scandium alloys in domestic industry is mainly the method of preparing aluminum-scandium alloys by reducing aluminum-scandium (see patent ZL200410046915.2). This method can only prepare aluminum alloys with a scandium content of 1-3%, and the scandium yield is less than 88%. Due to the use of ammonium hydrogen fluoride as the fluorinating agent without further treatment, the production environment without protection is poor
[0004] Domestic preparation of high-scandium-containing alloys (scandium-containing > 3%) generally still adopts the counter-infiltration method, and the production cost is high
According to reports, the method of preparing aluminum-scandium alloys by vacuum aluminothermic reduction of scandium fluoride has been used in semi-industrial production in Russia. The three-stage heating process is used to produce high-content scandium alloys, but the scandium content is difficult to control. more complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The specific steps of the method for preparing aluminum-scandium alloy by aluminothermic reduction of scandium fluoride of the present invention are as follows:

[0020] Put 21 grams of scandium fluoride and 100 grams of aluminum as raw materials into a graphite crucible, then place it in a vacuum reactor, evacuate the gas at low temperature and pump the vacuum to -0.1Mpa, maintain the vacuum, heat up to melt the aluminum and raise the temperature to 1100 ℃, stirring continuously, controlling the temperature until the surface of the melt is clear, then cooling and casting to obtain the aluminum-scandium alloy of the present invention.

Embodiment 2

[0022] The specific steps of the method for preparing aluminum-scandium alloy by aluminothermic reduction of scandium fluoride of the present invention are as follows:

[0023] Put 39.1 grams of scandium fluoride and 100 grams of aluminum into a graphite crucible, then place it in a vacuum reactor, evacuate the gas at a low temperature and pump the vacuum to -0.1Mpa, maintain the vacuum, heat up to melt the aluminum and raise the temperature to 1250 ℃, stirring continuously until the surface of the melt is clear, then cooling and casting to obtain the aluminum-scandium alloy of the present invention.

Embodiment 3

[0025] The specific steps of the method for preparing aluminum-scandium alloy by aluminothermic reduction of scandium fluoride of the present invention are as follows:

[0026] Put 54.8 grams of scandium fluoride and 100 grams of aluminum into a graphite crucible, then place it in a vacuum reactor, evacuate the gas at low temperature and pump the vacuum to -0.1Mpa, maintain the vacuum, heat up to melt the aluminum and raise the temperature to 1350 ℃, stirring continuously until the surface of the melt is clear, then cooling and casting to obtain the aluminum-scandium alloy of the present invention.

[0027] The aluminum-scandium alloys prepared in Examples 1-3 were measured, and the experimental results are shown in Table 1:

[0028] Table 1

[0029] sample

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PUM

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Abstract

The invention discloses a method for preparing an aluminum scandium alloy through thermal reduction of scandium fluoride. The method comprises the following steps: filling the raw material scandium fluoride and the aluminum into a graphite crucible, putting in a vacuum reactor, vacuumizing to -0.1 MPa, degassing under a low temperature, keeping the vacuum degree, warming and melting the aluminum, heating to the temperature of 1100-1350 DEG C, continuously stirring, controlling the temperature till the surface of the melt is clear, reducing the temperature and casting to obtain the aluminum scandium alloy. The method for preparing the aluminum scandium alloy is a scandium fluoride vacuum aluminothermic reduction method; the prepared aluminum scandium alloy is high in scandium content, controllable in scandium element, high in scandium converting yield of greater than 95%, and low in fluorine content of less than 200 ppm and the byproduct can be comprehensively recovered.

Description

technical field [0001] The invention relates to the technical field of metal alloys, in particular to a method for preparing an aluminum-scandium alloy by aluminothermic reduction of scandium fluoride. Background technique [0002] Aluminum-scandium alloy is a high-performance aluminum alloy. There are several ways to improve the performance of aluminum alloys. Among them, microalloying, strengthening and toughening has been the frontier field of research on high-performance aluminum alloys in the past 20 years. The so-called microalloying strengthening and toughening usually refers to a technique of adding or compounding trace elements with a mass percentage of less than 0.5% to aluminum alloys to greatly improve the strength and toughness of the alloy. Scandium, as a transition group element and rare earth element, is added to aluminum and aluminum alloys, which can not only significantly refine the as-cast alloy grains, increase the recrystallization temperature to improv...

Claims

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Application Information

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IPC IPC(8): C22B5/04C22B59/00C22C1/02C22C21/00
Inventor 翁国庆马小波陈建波包新军
Owner 翁国庆
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