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Covering agent as well as preparation method and application thereof

A technology of covering agent and No. 2 flux, which is applied in the field of covering agent and its preparation, can solve problems such as performance failure and material fracture, achieve good wettability, small surface tension, and reduce loose size

Active Publication Date: 2021-05-07
SOUTHWEST ALUMINUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Covering agent as well as preparation method and application thereof

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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. The covering agent comprises a cooling material KCl, a refractory component BaCl2, a second flux, LiCl and AlF3 according to the mass ratio of (1.8-2.2): 1: (28-30): (4.5-5.5): (14-16). The second flux comprises, by weight, 32-42 wt% of KCl, 38-46% of MgCl2, 5-8% of BaCl2; and less than or equal to 8% in total of NaCl and CaCl2. The covering agent provided by the invention can improve the fracture toughness of an aluminum-lithium alloy, improve the fatigue performance, and reduce the loose size. The covering agent provided by the invention can protect a melt from being isolated from the atmosphere, also can purify the melt, can adsorb and dissolve non-metallic inclusions in the melt, also can reduce sodium enrichment to be less than 10 ppm, and is small in surface tension, small in viscosity and good in wettability. The result shows that the average loose size of the aluminum-lithium alloy is smaller than 40 * 100 microns.

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