Method for preparing aluminum-scandium alloy with high scandium content

A technology of aluminum-scandium content, which is applied in the field of preparation of high-scandium-content aluminum-scandium alloys, can solve the problems of difficult alloy smelting, coarse alloy grains, and fast cooling speed, so as to reduce the homogenization treatment time and significantly refine the grains , the effect of increasing the cooling rate

Active Publication Date: 2020-12-11
HUNAN RARE EARTH METAL MATERIAL RES INST
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Problems solved by technology

[0004] The method of blending is to directly add metal scandium to molten aluminum, and then cast aluminum scandium alloy after stirring. Due to the active chemical properties of metal scandium, the melting point of metal aluminum is quite different, so the higher the content of scandium, the more difficult it is to smelt the alloy; Direct furnace cooling and solidification of the alloy can easily lead to coarse grains of the alloy, serious composition segregation, low density, and poor mechanical properties, which are not conducive to subsequent deformation processing
[0005] The aluminothermic reduction method uses scandium-containing compounds as raw materials, metal aluminum as the reducing agent, and the scandium-containing raw materials are reduced to metal scandium in the aluminum melt at high temperature, and the formed metal scandium diffuses into the aluminum melt or forms aluminum scandium compounds with aluminum , the prior art discloses that scandium oxide is used as a raw material, molten aluminum is used as a reducing agent, potassium chloride, sodium fluoride, additives and other additives are added, and scandium oxide is reduced to metal scandium at high temperature, which enters the aluminum liquid to form The method of the master alloy has the following problems: fluorine element will be introduced into the product, the environmental pollution is serious, and it is mostly used to prepare aluminum-scandium alloy with low scandium content, etc.
[0006] The molten salt electrolysis method is based on the molten salt electrolysis system (Na 3 AlF 6 -KCl-NaCl-ScF 3 or ScCl 3 -KCl-Na

Method used

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  • Method for preparing aluminum-scandium alloy with high scandium content
  • Method for preparing aluminum-scandium alloy with high scandium content
  • Method for preparing aluminum-scandium alloy with high scandium content

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Embodiment 1

[0042] In this embodiment, the preparation of an aluminum-scandium alloy ingot with a scandium content of 10% is taken as an example for illustration, and the specific steps are as follows:

[0043] S1. Feeding: Weigh 1.6 kg of bulk high-purity metal scandium with a purity of 99.99%, and 14.4 kg of massive high-purity metal aluminum with a purity of 99.99%, and put them into a 50 kg medium-frequency induction melting furnace.

[0044] S2. Vacuuming: Vacuuming after closing the furnace cover, the vacuum degree is lower than 5×10 -2 After Pa, the temperature was raised.

[0045] S3. Melting: continue vacuuming, adjust the power output of the intermediate frequency induction melting furnace to 55KW, and heat up to 1200°C to melt the metal raw material.

[0046] S4. Heat preservation: continue heat preservation for 30 minutes after the metal is completely melted.

[0047] S5. Pouring: fill with high-purity argon, pour the aluminum-scandium alloy liquid into the Φ300×200mm water-...

Embodiment 2

[0050] In this embodiment, the preparation of an aluminum-scandium alloy ingot with a scandium content of 20% is taken as an example for illustration, and the specific steps are as follows:

[0051] S1. Feeding: Weigh 1.5 kg of massive high-purity metal scandium with a purity of 99.99%, and 6 kg of massive high-purity metal aluminum with a purity of 99.99%, and put them into a 20 kg medium-frequency induction melting furnace.

[0052] S2. Vacuuming: Vacuuming after closing the furnace cover, the vacuum degree is lower than 5×10 -2 After Pa, the temperature was raised.

[0053] S3. Melting: continue vacuuming, adjust the output power of the intermediate frequency induction melting furnace to 70KW, and heat up to 1300°C to melt the metal raw material.

[0054] S4. Heat preservation: continue heat preservation for 30 minutes after the metal is completely melted.

[0055] S5. Pouring: fill with high-purity argon, pour the aluminum-scandium alloy liquid into the Φ220×150mm water-...

Embodiment 3

[0079] In this embodiment, the preparation of an aluminum-scandium alloy ingot with a scandium content of 30% is taken as an example for illustration, and the specific steps are as follows:

[0080] S1. Feeding: Weigh 1.2 kg of bulk high-purity metal scandium with a purity of 99.99%, and 2.8 kg of massive high-purity metal aluminum with a purity of 99.99%, and put them into a 10 kg medium-frequency induction melting furnace.

[0081] S2. Vacuuming: Vacuuming after closing the furnace cover, the vacuum degree is lower than 5×10 -2 After Pa, the temperature was raised.

[0082] S3. Melting: continue vacuuming, adjust the output power of the intermediate frequency induction melting furnace to 75KW, and heat up to 1390°C to melt the metal raw material.

[0083] S4. Heat preservation: heat preservation for 30 minutes after the metal is melted.

[0084] S5. Pouring: Fill with high-purity argon, pour the aluminum-scandium alloy liquid into a 200×200×80mm water-cooled copper mold to...

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Abstract

The invention discloses a method for preparing an aluminum-scandium alloy with high scandium content. The method comprises the steps that metal scandium and metal aluminum are weighed according to thescandium content in the aluminum-scandium alloy needing to be prepared; the obtained materials are added into a medium-frequency induction melting furnace, continuously vacuumizing is carried out, and then heating is carried out to 1200-1600 DEG C to melt the metal scandium and the metal aluminum; after complete melting is achieved, alloy liquid is obtained, and heat preservation is carried out for 20-40 min; and high-purity argon is introduced in, the alloy liquid subjected to heat preservation is poured into a water-cooled copper die, circulating water is cooled to 1-15 DEG C by adopting amold circulating water refrigerating system, the cooled circulating water is introduced into the water-cooled copper die to circularly cool the alloy liquid, and cooling and solidifying of the alloy liquid can be completed within 3-8 seconds to obtain an aluminum-scandium alloy cast ingot with scandium content of 5%-99%. According to the method, rapid cooling can be achieved within 3-8 s, the aluminum-scandium alloy with high scandium content which is high in purity, high in compactness, low in segregation, uniform in component and low in cost can be prepared, and the requirement of the current market for the aluminum-scandium alloy with high scandium content is met.

Description

technical field [0001] The invention relates to the technical field of preparation of aluminum-scandium alloys, in particular to a method for preparing aluminum-scandium alloys with high scandium content. Background technique [0002] Metal scandium is currently the most effective additive element to optimize the performance of aluminum alloys. A trace amount of scandium has a significant effect on refining alloy grains and inhibiting recrystallization. Aluminum-scandium alloy has the characteristics of high strength, low density, corrosion resistance, high temperature resistance, and good weldability. It is widely used in high-tech fields such as aerospace, nuclear missiles, high-speed trains, and sports equipment, especially in the electronic information technology industry. The aluminum-scandium alloy target with high scandium content can increase electron migration and stress displacement several times while maintaining the same electrical conductivity, and meet the requ...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C21/00
CPCC22C1/026C22C21/00
Inventor 张闻扬文康黄美松樊玉川黄培李剑刘维
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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