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Preparation method of aluminum-scandium master alloy

An intermediate alloy, aluminum scandium technology, applied in the field of high-performance aluminum alloy raw material preparation, to achieve the effect of small alloy grain size, small size and excellent refinement effect

Inactive Publication Date: 2010-05-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical route of this method is simple, but the disadvantage is that the reduction reaction is carried out in the atmosphere. If the pellets are not fully compacted during mixing, some air will be trapped in them, forming Sc 2 o 3 、Al 3 o 3 N. Al 2 o 3 and other impurities, the purity of the master alloy and the actual yield of scandium metal need to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 100 g of aluminum, 3.9 g of scandium oxide, and 28.8 g of molten salt system to prepare materials. Mix the above raw materials into a crucible, put it into a resistance furnace, cover the furnace cover, heat it to 950°C (the temperature control error does not exceed 20°C), and pour it after holding for 90 minutes. At the same time, stage electromagnetic stirring was performed at the same time, stirring once every 15 minutes, each stirring for 30 seconds, the frequency was 25 Hz, and the current was 30 A. The last stirring time just before pouring was 5 minutes. Open the furnace, take out the crucible, remove the slag, pour the alloy into the steel mold, remove the slag after solidification and cooling, weigh 102g, drill the debris from different parts of the alloy ingot, and analyze it by ICP-AES (plasma emission spectrometry). The scandium content was 2.04%, and the yield of scandium was 81.8%.

[0013] The as-cast sampling analysis shows that compared with the ...

Embodiment 2

[0015] Take 1kg of aluminum, 40g of scandium oxide, and 310g of molten salt system for preparation. Mix the above raw materials into the crucible, put it into a resistance furnace, cover the furnace cover, heat it to 950 ° C (the temperature control error does not exceed 20 ° C), and keep it for 100 minutes. Stir for 2 minutes, frequency is 25Hz, current is 30A. The last stirring time just before pouring was 10 minutes. Open the furnace, take out the crucible, remove the slag, pour the alloy into the steel mold, remove the slag after solidification and cooling, weigh 1.01kg, drill the debris from different parts of the alloy ingot, and analyze it by ICP-AES (plasma emission spectrometry). , the scandium content was 2.19%, and the yield of scandium was calculated to be 84.8%.

[0016] The as-cast sampling analysis shows that compared with the master alloy obtained by other methods, the microstructure obtained in this example has finer grains, and the primary Al 3 The size of...

Embodiment 3

[0018] Take 2kg of aluminum, 82g of scandium oxide, and 622g of molten salt system to prepare materials. Mix the above raw materials into the crucible, put it into a resistance furnace, cover the furnace cover, heat it to 950 ° C (the temperature control error does not exceed 20 ° C), and keep it for 110 minutes. Stir for 3 minutes, frequency is 25Hz, current is 30A. The last stirring time just before pouring was 15 minutes. Open the furnace, take out the crucible, remove the slag, pour the alloy into the steel mold, remove the slag after solidification and cooling, weigh 2.05kg, drill the debris from different parts of the alloy ingot, and analyze it by ICP-AES (plasma emission spectrometry). , the scandium content was 2.12%, and the calculated scandium yield was 81.3%.

[0019] The as-cast sampling analysis shows that compared with the master alloy obtained by other methods, the microstructure obtained in this example has finer grains, and the primary Al 3 The size of Sc ...

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Abstract

The invention relates to a preparation method of aluminum-scandium master alloy, which belongs to the technical field of high-performance aluminium alloy raw material preparation. The preparation method is characterized in that: the method adopts the following raw materials: Sc2O3, pure aluminium and a molten salt system, and comprises the following steps: mixing pure aluminium, Sc2O3 and the molten salt system uniformly once and adding the materials in a crucible; putting the crucible in a resistance furnace for heating and smelting, raising the temperature to 950+ / -20 DEG C, and keeping the temperature for 90 to 120 minutes; and casting and sampling after heat preservation. The molten salt system comprises NF4HF, NaF, KCl, NaCl, nNaF AlF3 (sodium cryolite) and nKF AlF3 (kalium cryolite) in a mixing ratio of 10:8:5.4:5.4:3:3; and the molten salt system, pure aluminium and Sc2O3 are added in the crucible in a mass ratio of 30+ / -1.5:100:4+ / -0.1. Compared with the prior art, the method has the advantages that: the prepared aluminum-scandium master alloy has smaller grain size, even distribution of Al3Sc, no obvious agglomeration and small size. When used in subsequent preparation of Sc-containing alloy, the master alloy has excellent refining effects.

Description

technical field [0001] The invention relates to a method for preparing and improving an aluminum-scandium master alloy. It belongs to the technical field of high-performance aluminum alloy raw material preparation. Background technique [0002] Scandium (Sc) is an element found so far that has the strongest grain refining effect on aluminum alloys and inhibits recrystallization. Adding scandium to aluminum alloy can greatly improve the properties of the alloy, which has become a research hotspot at home and abroad. The melting point of scandium is 1541 ℃, and the melting point of aluminum is 660 ℃. The melting point of the two metals is very different. Adding scandium to aluminum must be in the form of a master alloy. Therefore, the preparation of aluminum-scandium master alloy is a key link in the production of high-performance aluminum-scandium alloys. . [0003] At present, the preparation methods of scandium-containing master alloys at home and abroad mainly include c...

Claims

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Application Information

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IPC IPC(8): C22C1/02
Inventor 李培杰叶益聪何良菊
Owner TSINGHUA UNIV
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