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Magnesium reduction method for preparing scandium interalloy

A master alloy, aluminum-magnesium technology, applied in the field of preparation of scandium master alloy, can solve the problems of inability to improve the uniformity of scandium distribution, increase the difficulty of operation of process equipment, uneven distribution of scandium, etc., and achieve low cost, simple equipment, and impurity pollution. added effect

Inactive Publication Date: 2009-09-30
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

This patent uses scandium chloride as a raw material, and carries out magnesia thermal reduction in the presence of aluminum. It is difficult to prepare and store anhydrous scandium chloride, and it is easy to sublime and lose at high temperature, and it is reversed into scandium chloride that cannot be reduced by magnesium; after reduction The master alloy is distilled in a vacuum at 610-630°C to remove magnesium to prepare an aluminum-scandium binary master alloy with uniform scandium distribution. The distillation process increases the difficulty of operating the process equipment, and the main reason for the uneven distribution of scandium in the master alloy The reason is Al 3 The density of Sc intermetallic compounds is relatively high, and it is easy to deposit and enrich at the bottom of the ingot, so the distribution of scandium is uneven. Obviously, the distribution uniformity of scandium cannot be improved by distilling magnesium.

Method used

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  • Magnesium reduction method for preparing scandium interalloy
  • Magnesium reduction method for preparing scandium interalloy

Examples

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Embodiment 1

[0014] Embodiment 1 Get 100gSc 2 o 3 , dissolved in concentrated hydrochloric acid (25-30%) under heating conditions, making Sc 2 o 3 Chlorination to ScCl 3 solution; then 216gNaCl, 108gKCl and 184g of stabilizer NH 4 Dissolve Cl respectively in dilute hydrochloric acid solution (2-5%), add to ScCl 3 solution, the resulting solution was mixed and filtered, and the filtrate was evaporated to dryness and then evaporated under negative pressure. The composite chloride after removing the adsorbed water is put into a φ80mm high-purity graphite container and melted in an electric furnace at 800-850°C for 30 minutes to remove the crystal water and the stabilizer in the composite chloride to obtain a composite chloride molten salt. Put the graphite crucible with 2.5KgAl and 0.45KgMg into the vacuum intermediate frequency furnace, raise the temperature to 900°C under the protection of argon atmosphere, add the compound chloride melt in batches (about 50g for each batch, and the in...

Embodiment 2

[0015] Example 2 Take 2580g of pure aluminum ingot, 105g of pure magnesium ingot, 80g of Al-3.8%Zr master alloy, and 320g of Al-14.1Mg-1.89Sc master alloy prepared by the above method, and protect them with flux in the graphite crucible of resistance crucible boiler Melt and refine under high pressure, then cast into a 60mm thick ingot, after the ingot is homogenized, it is hot rolled at 470°C into a 3mm thick plate, and part of the hot rolled plate is cold rolled to a thickness of 2mm, and then stabilized at 130°C / 3h , and then test and inspect the mechanical properties and microstructure of alloys in different treatment states. Table 1 shows the mechanical properties and microstructure of the prepared Al-Mg-Sc master alloy in different treatment states.

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Abstract

The invention relates to a preparation method of an aluminum-magnesium-scandium master alloy. The invention uses non-high-purity scandium oxide as a raw material, and the scandium oxide becomes scandium chloride after being chlorinated, and the above-mentioned scandium-containing composite chloride is prepared by a metallothermal reduction method to prepare an aluminum-magnesium-scandium master alloy. Al-Mg-Sc master alloys with a scandium content of 1.5%-3% (weight percent) can be prepared by this method. The method for preparing scandium master alloy has simple process, uniform composition, and the recovery rate of scandium reaches 98%. The cost of scandium master alloy can be reduced by 25%. For the Al-Mg-Sc-Zr alloy prepared from the above-mentioned master alloy, the tensile strength of the finished plate is increased by 35%, the yield strength is increased by 73%, and the elongation remains at a high level of 13%.

Description

[technical field] [0001] The invention relates to a method for preparing a scandium master alloy, in particular to a method for preparing an aluminum-magnesium-scandium master alloy by using scandium chloride-alkali metal chloride molten salt to reduce magnesium-aluminum alloy melt. [Background technique] [0002] The aluminum alloy containing trace scandium has high strength, good plasticity, excellent welding performance, corrosion resistance and mechanical properties at low temperature. It is a new generation of lightweight structural materials for aerospace, aviation and ships. Scandium master alloy is the key raw material for the production of such scandium-containing aluminum alloys. [0003] At present, there are two practical preparation methods for aluminum-scandium master alloys: one is the aluminothermic reduction method of scandium fluoride, which uses scandium oxide as a raw material and fluorides it with HF gas, and then fluorides it in an intermediate frequenc...

Claims

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Application Information

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IPC IPC(8): C22C1/02
Inventor 尹志民李汉广彭志辉潘青林姜锋刘贻谋
Owner CENT SOUTH UNIV
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