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Protective flux for aluminum-lithium alloy and preparation method of protective flux

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

Active Publication Date: 2021-09-24
SHANGHAI JIAO TONG 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 of protective flux
  • Protective flux for aluminum-lithium alloy and preparation method of protective flux

Examples

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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 an aluminum-lithium alloy and a preparation method of the protective flux. Raw materials of the protective flux comprise the following components: lithium fluoride, lithium chloride, aluminum fluoride, potassium fluoride, hexachloroethane, ammonium chloride and ammonium fluoride. The materials are mixed according to a certain proportion to prepare the aluminum-lithium alloy material, the aluminum-lithium alloy material is applied to the smelting process of an aluminum-lithium alloy, oxygen and water vapor in air can be well isolated, meanwhile, due to the fact that the foaming agent component is added in the formula, protective gas can be generated in the smelting process, the flux protection effect is changed from single flux protection to flux-gas composite protection, so that the burning loss is effectively reduced, the good effect of long-time protection of the aluminum-lithium alloy melt is realized, and a certain effect of reducing impurities and pores is achieved. The protective flux can make up for the insufficiency of the existing protection flux in the aspect of protection effect, thereby effectively improving the quality of the aluminum-lithium alloy and finally improving the comprehensive performance of the aluminum-lithium alloy.

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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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 JIAO TONG UNIV
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