Aluminum-lithium alloy casting adopting shell to inhibit interface reaction and casting method of aluminum-lithium alloy casting

A technology of aluminum-lithium alloy and interfacial reaction, which is applied in the field of casting aluminum-lithium alloy, can solve the problems of not being disclosed, and achieve the effects of improving quality, reducing pore defects, and eliminating adverse effects

Active Publication Date: 2022-02-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no published method for suppressing the interfacial reaction of shell-cast Al-Li alloys on the market

Method used

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  • Aluminum-lithium alloy casting adopting shell to inhibit interface reaction and casting method of aluminum-lithium alloy casting
  • Aluminum-lithium alloy casting adopting shell to inhibit interface reaction and casting method of aluminum-lithium alloy casting
  • Aluminum-lithium alloy casting adopting shell to inhibit interface reaction and casting method of aluminum-lithium alloy casting

Examples

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Effect test

preparation example Construction

[0038] The preparation of the surface coating includes the following steps: first add the inhibitor to the refractory powder and stir evenly, then add the uniformly mixed refractory powder and inhibitor to the binder in batches, and apply mechanical stirring while adding the powder After all the powder is added to the binder, add a wetting agent and a suspending agent, continue stirring for 0.5h to 2h, and finally add a defoamer to obtain the surface coating. Among them, by adjusting the ratio of refractory powder and binder, the viscosity of the slurry can reach 30-40.

[0039] Sprinkle refractory powder immediately after coating the top coat. The corresponding refractory powder is any one of 80-120 mesh bauxite, zircon powder, forsterite, yttrium oxide and yttrium-stabilized zirconia.

[0040] Sprinkle the refractory material and carry out drying treatment. The drying method is drying in an oven. The drying temperature is 30°C-70°C, the humidity is 40%-60%, and the drying ti...

Embodiment 1

[0056] see figure 1 , Embodiment 1 of the present invention provides a casting method of an aluminum-lithium alloy casting that uses a shell to suppress the interface reaction of the shell-cast aluminum-lithium alloy, the method comprising the following steps:

[0057] (a) Preparation model

[0058] Specifically, it includes the following steps: first, use 3D software to design the 3D shape of the aluminum-lithium alloy casting to be manufactured, process the EPS foam by machine tool processing, and obtain the required foam model, and the foam model is dipped in liquid paraffin to achieve surface smoothing deal with.

[0059] (b) prepare inhibitor-containing surface layer, specifically comprising the following steps:

[0060] 1) Mix 200-mesh LiCl and LiF evenly at a mass ratio of 3:1, and add them to 200-mesh bauxite powder. The weight of LiCl+LiF is 3wt.% of the bauxite powder. After mixing evenly, add it in batches to the alkaline silica sol with a solid content of 30%, m...

Embodiment 2

[0087] (a) Preparation model

[0088] It specifically includes the following steps: first, use three-dimensional software to design the three-dimensional appearance of the aluminum-lithium alloy casting to be manufactured and the mold of the paraffin model, pour liquid paraffin into the mold, take it out after cooling, and obtain the paraffin model of the aluminum-lithium alloy casting to be manufactured.

[0089] (b) prepare inhibitor-containing surface layer, specifically comprising the following steps:

[0090] 1) Mix 200-mesh KCl and LiF evenly at a mass ratio of 2:1, and add them to 200-mesh zircon powder. The weight of KCl+LiF is 3wt.% of the zircon powder. After mixing evenly, add it in batches to the zirconium sol with a solid content of 30%, mechanically stir while adding the powder, and the powder-to-liquid ratio is 3.5.

[0091] 2) After the powder is completely added to the zirconium sol, add fatty alcohol polyoxyethylene ether (JFC) as a wetting agent and hydroxy...

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Abstract

The invention belongs to the related technical field of casting of aluminum-lithium alloy, and discloses an aluminum-lithium alloy casting adopting a shell to inhibit interface reaction and a casting method of the aluminum-lithium alloy casting. The method comprises the following steps of (1) coating a surface layer coating on the surface of a three-dimensional model of the aluminum-lithium alloy casting to be manufactured to obtain a surface layer, wherein the component of the surface layer coating comprises an inhibitor, (2) after preparing a back layer on the surface layer, sequentially removing the three-dimensional model and roasting to obtain a shell, (3) preparing a graphite coating on the inner surface of the shell, (4) pouring aluminum-lithium alloy liquid into the shell, and then acquiring an aluminum-lithium alloy casting, wherein when the aluminum-lithium alloy liquid is in contact with the shell, the aluminum-lithium alloy liquid firstly reacts with an inhibitor in the surface coating to form a layer of lithiation thin film, and the lithiation thin film inhibits the reaction of the shell and the aluminum-lithium alloy liquid. The interface reaction of the aluminum-lithium alloy and the shell is weakened, and the performance of the aluminum-lithium alloy casting is improved.

Description

technical field [0001] The invention belongs to the related technical field of casting aluminum-lithium alloys, and more specifically relates to an aluminum-lithium alloy casting and a casting method thereof which adopt a shell to suppress interface reaction. Background technique [0002] Aluminum-lithium alloy has many advantages such as low density, high specific strength and specific stiffness, good corrosion resistance and fatigue resistance, and has very broad application prospects in aerospace and other fields. At present, cast aluminum-lithium alloys are generally prepared by sand casting, but due to the extremely active nature of Li, it is easy to react with the binder, curing agent and molding sand in the mold, and the poor metal-mold interface reaction causes castings Poor surface quality and many defects such as pores and inclusions in the casting make the performance of the casting poor and difficult to meet the requirements of use. An Geying and others from Har...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C3/00B22C9/12C22C21/00
CPCB22C9/043B22C3/00B22C9/12C22C21/00
Inventor 蒋文明李广宇于洋樊自田管峰张政
Owner HUAZHONG UNIV OF SCI & TECH
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