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Protective flux for aluminum-lithium alloy and preparation method thereof

An aluminum-lithium alloy and flux technology, which is applied in the field of metallurgical smelting, can solve the problems of easy oxidation, burning loss and poor purification effect of the aluminum-lithium alloy, achieve good coverage and protection, improve comprehensive performance, and effectively absorb impurities.

Active Publication Date: 2022-03-01
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a protective flux for aluminum-lithium alloy and its preparation method in view of the problems of easy oxidation, serious burning loss and poor purification effect during aluminum-lithium alloy smelting

Method used

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  • Protective flux for aluminum-lithium alloy and preparation method thereof

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Effect test

Embodiment 1

[0031] A protective flux for aluminum-lithium alloys, the raw materials include the following components: lithium fluoride, lithium chloride, aluminum fluoride, potassium fluoride, hexachloroethane, ammonium chloride and ammonium fluoride; the quality of the protective flux is The ratio is 29.5:51:9:7:1:1.5:1; the above raw materials all meet: purity ≥ 99.7%.

[0032] Lithium fluoride, lithium chloride, aluminum fluoride, and potassium fluoride powders were mixed in a three-dimensional mixer and placed in a crucible according to the above proportions, melted at 720°C for 20 minutes, condensed for 1.5 hours to about 20°C, and obtained Mixed blocks. Subsequently, the mixed block was mixed with hexachloroethane, ammonium chloride and ammonium fluoride, and ball milled for 2 hours, and the mixture was crushed and sieved to obtain granular flux. Then put it in an oven to dry for about 5 hours, take it out and ball mill it again for 2 hours, and then take out the material and seal ...

Embodiment 2

[0035] A protective flux for aluminum-lithium alloys, the raw materials include the following components: lithium fluoride, lithium chloride, aluminum fluoride, potassium fluoride, hexachloroethane, ammonium chloride and ammonium fluoride; the quality of the protective flux is The ratio is 33:49:7.5:7:1.5:1:1; the above raw materials all meet: purity ≥ 99.7%.

[0036] Lithium fluoride, lithium chloride, aluminum fluoride, and potassium fluoride powders were mixed in a three-dimensional mixer and placed in a crucible according to the above proportions, melted at 720°C for 20 minutes, condensed for 1.5 hours to about 20°C, and obtained Mixed blocks. Subsequently, the mixed block was mixed with hexachloroethane, ammonium chloride and ammonium fluoride, and ball milled for 2 hours, and the mixture was crushed and sieved to obtain granular flux. Then put it in an oven to dry for about 5 hours, take it out and ball mill it again for 2 hours, and then take out the material and seal ...

Embodiment 3

[0039] A protective flux for aluminum-lithium alloys, the raw materials include the following components: lithium fluoride, lithium chloride, aluminum fluoride, potassium fluoride, hexachloroethane, ammonium chloride and ammonium fluoride; the quality of the protective flux is The ratio is 25.5:53:11:9:2:1.5:3; the above raw materials all meet: purity ≥ 99.7%.

[0040] Lithium fluoride, lithium chloride, aluminum fluoride, and potassium fluoride powders were mixed in a three-dimensional mixer and placed in a crucible according to the above proportions, melted at 720°C for 20 minutes, condensed for 1.5 hours to about 20°C, and obtained Mixed blocks. Subsequently, the mixed block was mixed with hexachloroethane, ammonium chloride and ammonium fluoride, and ball milled for 2 hours, and the mixture was crushed and sieved to obtain granular flux. Then put it in an oven to dry for about 5 hours, take it out and ball mill it again for 2 hours, and then take out the material and seal...

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Abstract

The invention provides a protective flux for aluminum-lithium alloys and a preparation method thereof. The raw materials include the following components: lithium fluoride, lithium chloride, aluminum fluoride, potassium fluoride, hexachloroethane, ammonium chloride and fluoride Ammonium; the above materials are prepared by mixing according to a certain proportion, which is applied in the melting process of aluminum-lithium alloy, which can well isolate oxygen and water vapor in the air. The protective gas can be generated during the process, so that the melt protection effect is changed from a single flux protection to a flux-gas composite protection, which effectively reduces the burning loss and achieves a good effect on the long-term protection of the aluminum-lithium alloy melt. It has a certain effect of reducing impurities and pores. The invention can make up for the deficiency of the existing protective flux in terms of protective effect, so it can effectively improve the quality of the aluminum-lithium alloy, and finally improve its comprehensive performance.

Description

technical field [0001] The invention belongs to the field of metallurgical smelting, and in particular relates to a protective flux for aluminum-lithium alloy and a preparation method thereof. Background technique [0002] As an emerging lightweight alloy, Al-Li alloys can effectively improve the high-cycle fatigue properties and fatigue crack growth resistance of aluminum alloys, and correspondingly increase the tensile strength. At the same time, the temperature-fracture toughness of Al-Li alloys at low temperatures The overall performance is also greatly enhanced. The use of aluminum-lithium alloys to manufacture aircraft components can reduce the weight of the aircraft by 10%-20%, thereby saving fuel, reducing manufacturing costs, and improving the flight speed and carrying capacity of the aircraft. Therefore, aluminum-lithium alloys have shown great potential beyond aluminum alloys and have attracted people's attention. [0003] However, due to the addition of lithium...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C1/02C22C21/00
CPCC22C1/06C22C1/026C22C21/00
Inventor 唐文浩张亮吴国华张小龙刘文才
Owner SHANGHAI JIAOTONG UNIV
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