Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of aluminum-scandium intermediate alloy, aluminum-scandium intermediate alloy and aluminum-scandium alloy

An intermediate alloy and aluminum alloy technology, applied in the field of aluminum alloy, can solve the problems of slow reaction speed, lower scandium yield, prolong production cycle, etc., achieve semi-continuous production, rapid reduction reaction, and improve production efficiency

Active Publication Date: 2016-07-27
GRIREM ADVANCED MATERIALS CO LTD
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned preparation methods all have the following disadvantages: (1) the amount of slag in the compound salt composed of scandium oxide and solvent is large, the quality of the compound salt is about 20-200% of the alloy mass, and the concentration of scandium oxide in the molten salt is very low, Generally be less than 15%, cause reaction speed to be slow, prolong reaction time; (2) partial scandium oxide is dissolved in compound salt and can not react completely, has reduced the yield of scandium, and the yield of scandium in the prior art is 60-85% , the yield of scandium in individual examples can reach 89%; (3) the aluminum oxide in the aluminum-scandium intermediate alloy liquid is transferred to the solvent only by diffusion and mass transfer, and the mass transfer rate is slow, which not only prolongs the production cycle, but also may cause intermediate The inclusion of alumina in the alloy product reduces the purity of the intermediate alloy; (4) The whole process basically includes the stages of charging - heating - reaction - heat preservation - pouring, etc., and after casting, it is necessary to wait for the reaction furnace to cool and take out the ingot before proceeding to the next step. Furnace production, not continuous production
The above shortcomings will lead to long production cycle and low production efficiency of Al-Sc master alloy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] It can be seen from the background technology that the production cycle of the existing aluminum-scandium master alloy is long and the production efficiency is low. The inventors of the present invention conducted research on the above problems and proposed a method for preparing an aluminum-scandium master alloy. The preparation method comprises the following steps: adding a scandium-containing compound and an aluminum-containing raw material into a first reactor for thermal reduction reaction to form a liquid aluminum-scandium master alloy, the aluminum-containing raw material comprising aluminum and / or an aluminum alloy; adding the liquid aluminum-scandium The master alloy is added to the second reactor filled with molten salt for extracting slag treatment, and the density of the molten salt is lower than the density of the liquid aluminum-scandium master alloy; and the liquid aluminum-scandium master alloy obtained after the slag extraction is cooled and solidified to ...

Embodiment 1

[0047] This embodiment provides a method for preparing an aluminum-scandium master alloy comprising the following steps:

[0048] First, 35g of Sc 2 o 3 , the Ca of 20g and the Al of 980g are placed in the first tungsten crucible; Then, adopt electric frequency induction heating to 950 ℃ of insulations and react for 10 minutes; KF, CaCl 2 and AlF 3 ) of the second tungsten crucible for slag extraction, and the NaF+KF in the molten salt: CaCl 2 : AlF 3 The mass ratio of the molten salt is 13:11:8, the temperature of the molten salt is 1200°C, mechanical stirring is applied during the slag extraction process, and the liquid aluminum-scandium master alloy is deposited on the bottom of the crucible after 10 minutes of extraction slag separation; finally, The liquid aluminum-scandium master alloy was produced by siphon method, and 974g of aluminum-scandium master alloy was obtained after cooling, and the Sc content of the aluminum-scandium master alloy was 2.17%, the yield of ...

Embodiment 2

[0050] This embodiment provides a method for preparing an aluminum-scandium master alloy comprising the following steps:

[0051] First, 35g of Sc 2 o 3 , 1000g of Al is placed in the first tungsten crucible; then, adopt electric frequency induction to heat to 950 ℃ for 10 minutes and react; 2 and AlF 3 ) of the second tungsten crucible for slag extraction, and the NaF+KCl in the molten salt: CaCl 2 : AlF 3 The mass ratio of the molten salt is 13:2:10, the temperature of the molten salt is 1200°C, mechanical stirring is applied during the slag extraction process, and the liquid aluminum-scandium master alloy is deposited on the bottom of the crucible after the slag is separated for 10 minutes; finally, The liquid aluminum-scandium master alloy was produced by siphon method, and 972g of aluminum-scandium master alloy was obtained after cooling, and the Sc content of the aluminum-scandium master alloy was 2.18%, the yield of Sc was 92.9%, and the mass fraction of Al+Sc was 9...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The invention provides a preparation method of an aluminum-scandium intermediate alloy, an aluminum-scandium intermediate alloy and an aluminum-scandium alloy. The preparation method comprises that a scandium-containing compound and an aluminum-containing raw material are added into a first reactor and undergo a thermal reduction reaction to produce a liquid aluminum-scandium intermediate alloy, wherein the aluminum-containing raw material contains aluminum and / or an aluminum alloy, the liquid aluminum-scandium intermediate alloy is added into a second reactor with melt salt and is subjected to slag extraction treatment, wherein the density of the melt salt is less than density of the liquid aluminum-scandium intermediate alloy, and the liquid aluminum-scandium intermediate alloy subjected to slag extraction treatment is cooled and cured so that an aluminum-scandium intermediate alloy cast ingot is obtained. The preparation method realizes a thermal reduction reaction and a slag extraction treatment process in different reactors, realizes semi-continuous production of the aluminum-scandium intermediate alloy, improves aluminum-scandium intermediate alloy production efficiency and improves aluminum-scandium intermediate alloy uniformity.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a method for preparing an aluminum-scandium master alloy, an aluminum-scandium master alloy and an aluminum-scandium alloy. Background technique [0002] Scandium is the element that has the strongest grain refinement and recrystallization inhibitory effect on aluminum alloys found so far. Adding a small amount of scandium to aluminum alloy can greatly improve the strength, corrosion resistance, welding performance and other properties of aluminum alloy. The melting point of scandium is 1541°C, while the melting point of aluminum is 660.37°C. There is a big difference in the melting points of these two metals. If scandium is directly added to the aluminum alloy, it not only requires a higher temperature, which consumes too much energy, but also easily causes the segregation and aggregation of scandium in the aluminum alloy. Therefore, in the production process of scandi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/00
Inventor 张小伟苗睿瑛闫缓王志强陈德宏周林朱琼吴道高张虎李宗安颜世宏
Owner GRIREM ADVANCED MATERIALS CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products