Method for preparing aluminum-scandium intermediate alloy by thermally reducing aluminum in elpasolite fused salt

A technology of master alloy and potassium cryolite, applied in the field of materials, can solve the problems of low solubility, high alloy cost, serious alloy segregation, etc., and achieve the effects of simple process, reduced production cost, and shortened preparation process.

Active Publication Date: 2017-02-08
NORTHEASTERN UNIV
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Problems solved by technology

[0004] The blending method is to directly fuse metal aluminum and scandium at high temperature to prepare aluminum-scandium master alloy; in the preparation process of Al-Sc master alloy, aluminum and scandium are melted at high temperature, and a uniform aluminum-scandium alloy is formed after sufficient stirring, and the heat preservation is sufficient After a period of time, cast it into a preheated iron mold or copper mold; when using this method to prepare Al-Sc master alloy, due to the large difference in melting point between aluminum and scandium, aluminum and scandium are not easy to mix uniformly, and the segregation in the formed alloy is serious ; In addition, when adopting the method for preparing the Al-Sc master alloy, it is necessary to use pure metal scandium as a raw material, and the burning loss of scandium in the preparation process is relatively large, and the cost of the prepared alloy is relatively high
[0005] Molten salt electrolysis is usually referred to as Sc 2 o 3 As raw materials, it can be roughly divided into three categories according to the composition of the electrolyte, one is containing ScCl 3 or ScF 3 or ScCl 3 -ScF 3 Electrolyte system, Sc 2 o 3...

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  • Method for preparing aluminum-scandium intermediate alloy by thermally reducing aluminum in elpasolite fused salt

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Embodiment 1

[0031] anhydrous KF and anhydrous AlF 3 Mixed to make molten salt, in which KF and AlF 3 The molar ratio is 1.5;

[0032] Will Sc 2 o 3 Add to molten salt and mix well to make mixed salt, Sc 2 o 3 The addition amount is KF and AlF 3 3% of the total mass;

[0033] Place the mixed salt in a corundum crucible and heat it up to 720°C, keep it warm for 60 minutes to completely melt the material and form a molten mixed salt;

[0034] Add the reducing agent metal aluminum to the molten mixed salt, the dosage is according to the metal aluminum and Sc 2 o 3 The molar ratio is 40:1, and then thermal reduction is carried out at 720°C for 3 hours. After the reduction, the alloy part and the electrolyte part are separated, and the alloy part is condensed to form an aluminum-scandium master alloy; the mass of scandium in the aluminum-scandium master alloy The percentage is 2.1%; the components of the electrolyte part include KF, AlF 3 , AlO produced by the reaction 3 and unreacte...

Embodiment 2

[0036] Method is with embodiment 1, and difference is:

[0037] (1) KF and AlF 3 The molar ratio is 1.8;

[0038] (2) Sc 2 o 3 The addition amount is KF and AlF 3 9% of the total mass;

[0039] (3) Heat the mixed salt to 1020°C and keep it warm for 30 minutes;

[0040] (4) Add the amount of metal aluminum according to metal aluminum and Sc 2 o 3 The molar ratio is 35:1, thermal reduction is carried out at 1020°C, and the reduction time is 0.5h; the mass percentage of scandium in the aluminum-scandium master alloy is 2.33%.

Embodiment 3

[0042] Method is with embodiment 1, and difference is:

[0043] (1) KF and AlF 3 The molar ratio is 2.0;

[0044] (2) Sc 2 o 3 The addition amount is KF and AlF 3 4% of the total mass;

[0045] (3) Heat the mixed salt to 800°C and keep it warm for 50 minutes;

[0046] (4) Add the amount of metal aluminum according to metal aluminum and Sc 2 o 3 The molar ratio is 30:1, thermal reduction is carried out at 800°C, and the reduction time is 2.5h; the mass percentage of scandium in the aluminum-scandium master alloy is 2.47%.

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Abstract

The invention discloses a method for preparing an aluminum-scandium intermediate alloy by thermally reducing aluminum in elpasolite fused salt and belongs to the technical field of materials. The method comprises the following steps: (1) mixing anhydrous KF and anhydrous AlF3; (2) adding Sc2O3 and uniformly mixing; (3) increasing the temperature of mixed salt to 720-1020 DEG C, and maintaining temperature for 30-60 minutes; and (4) adding reducer metal aluminum, thermally reducing at the temperature of 720-1020 DEG C, separating an alloy part and an electrolyte part, condensing the alloy part and then forming the aluminum-scandium intermediate alloy. An electrolyte system adopted by the method is high in solubility of KF-AlF3; the content of Sc in the prepared Al-Sc intermediate alloy meets the requirement of the national standard; low-cost scandium oxide is used as the raw material; the process is simple; the preparation process of the aluminum-scandium intermediate alloy is shortened; the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing an aluminum-scandium master alloy by aluminothermic reduction in potassium cryolite molten salt. Background technique [0002] Sc is the most effective alloying element found so far. The addition of trace elements of Sc can significantly improve the mechanical properties, high temperature performance, corrosion resistance, welding performance and enhance the neutron radiation damage resistance of the alloy. It has broad application prospects in aerospace, nuclear reactors and transportation. Since the melting point of metal scandium is as high as 1541°C and its chemical properties are active, scandium must be added in the form of master alloy when preparing aluminum scandium alloy, so Al-Sc master alloy becomes the key raw material for preparing aluminum scandium alloy. [0003] At present, the preparation methods of Al-Sc master alloy at hom...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C21/00C22B5/04
CPCC22B5/04C22C1/026C22C21/00
Inventor 王兆文张鹏举刘小珍陈文婷石忠宁高炳亮胡宪伟于江玉
Owner NORTHEASTERN UNIV
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