A kind of covering agent and its preparation method and application

A technology of covering agent and No. 2 flux, which is applied in the field of covering agent and its preparation, can solve the problems of unsatisfactory performance and material fracture, and achieve the effects of good wettability, low surface tension and improved fatigue performance.

Active Publication Date: 2021-11-12
SOUTHWEST ALUMINUM GRP
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Problems solved by technology

[0004] The traditional aluminum-lithium alloy flux is NaCl-KCl-NaF, which will cause the enrichment of Na in the aluminum-lithium alloy, and finally the Na content in the aluminum-lithium alloy will reach 50ppm, which will easily cause Na brittleness, resulting in material fracture and performance that cannot meet the requirements

Method used

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  • A kind of covering agent and its preparation method and application

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preparation example Construction

[0025] The present invention provides a kind of preparation method of covering agent described in above-mentioned technical scheme, comprises the following steps:

[0026] No. 2 flux, LiCl and AlF 3 Furnace mixing, smelting, adding refractory components, melting again, adding cooling materials to obtain molten salts;

[0027] The molten salt is cast and ball milled to obtain a covering agent.

[0028] The present invention uses No. 2 flux, LiCl and AlF 3 When loading the furnace, the furnace body must be cleaned, and the furnace temperature should be raised to above 900°C. The melting temperature is preferably 750-800° C.; the melting time is preferably 2-3 hours.

[0029] Add refractory component BaCl 2 Melt again at 630-680°C. The cooling material KCl is added, on the one hand, the cooling casting is convenient for operation; on the other hand, in order to shorten the condensation time, reduce component segregation, and ensure uniform flux composition.

[0030] After t...

Embodiment 1

[0035] No. 2 flux, LiCl and AlF 3 Mix furnace, smelt at 750~780℃ for 1.5h, add refractory component BaCl 2 , melt again at 630-650°C for 1 hour, add cooling material KCl to obtain molten salts;

[0036] Casting the molten salt at 720°C, cold processing and ball milling to obtain a covering agent; the particle size of the covering agent is <1.5 mm in powder form;

[0037] Among them, the cooling material KCl, the refractory component BaCl 2 , No. 2 flux, LiCl and AlF 3 The mass ratio is 2:1:27:5:15;

[0038] KCl 42wt% in the No. 2 flux; MgCl 2 46wt%; BaCl 2 6wt%; NaCl and CaCl 2 Total content≤1.0wt%, H 2 O≤2.0wt%.

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Abstract

The invention provides a covering agent comprising cooling material KCl and refractory component BaCl with a mass ratio of 1.8-2.2:1:28-30:4.5-5.5:14-16 2 , No. 2 flux, LiCl and AlF 3 ; Include KCl 32~42wt% in the No. 2 flux; MgCl 2 38~46wt%; BaCl 2 5~8wt%; NaCl and CaCl 2 Total content≤8wt%. The covering agent provided by the invention can improve the fracture toughness of the aluminum-lithium alloy, improve the fatigue performance and reduce the loose size. The covering agent provided by the invention can protect the melt from the atmosphere, can also purify the melt, can absorb and dissolve non-metallic inclusions in the melt, can also reduce sodium enrichment to less than 10ppm, has small surface tension, low viscosity, and moistens Moisture is good. The results show that the average porosity size of Al-Li alloy is less than 40×100μm.

Description

technical field [0001] The invention belongs to the technical field of covering flux, and in particular relates to a covering agent and its preparation method and application. Background technique [0002] Aluminum-lithium alloys are mainly melted in the atmosphere by an electric induction reverberatory furnace, and flux protection is used on the surface of the melt to reduce atmospheric oxidation. The difficulty in melting and casting Al-Li alloys is due to the fact that lithium reacts easily with oxygen and nitrogen. Li can generate Li with dry oxygen above 100°C 2 O. Li also reacts with water vapor in the furnace environment to form Li 2 O and H 2 , moisture, CO 2 It will also form a small amount of LiOH and LiOH·H with Li 2 O, even, molten Li reacts with nitrogen to form black, hygroscopic nitride Li 3 N. [0003] However, during the smelting and casting of aluminum-lithium alloys, Li oxides and nitrides are solid, while Li hydroxides are molten; at 500-800°C, Li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/06C22C1/02B22D21/04B22D1/00
CPCB22D1/00B22D21/04C22C1/026C22C1/06
Inventor 李朝阳黄光杰
Owner SOUTHWEST ALUMINUM GRP
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