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

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

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Preparation of the surface layer coating includes the following steps: first add inhibitor to the refractory powder to stir well, then mix the mixed uniform refractory powder and inhibitor batch binding into the binder, apply a mechanical stirring while adding powder After all of the gas is added to the binder, the lubricant and suspending agent are added, and stirring is continued for 0.5 h to 2 h, and finally the antifoaming agent is added to obtain the surface layer coating. Among them, the viscosity of the slurry reaches 30 to 40 by adjusting the ratio of the refractory powder and the binder.

[0039] After coating the upper layer coating, immediately sprinkle with refractory powder, the corresponding refractory powder is 80 mesh ~ 120 purposes of aluminum soil, zirconium powder, magnesium olivine, yttrium oxide and yttrium stabilized zirconia.

[0040] After the refractory material was subjected to drying, the drying treatment was dried in the drying box, and the dryin...

Example Embodiment

[0055] Example 1

[0056] See figure 1 Embodiment 1 of the present invention provides a cast method of aluminum lithium alloy castings reactive with a shell-type cast aluminum lithium alloy interface, including the following steps:

[0057] (a) Preparation model

[0058] Specifically, the following steps: First, the three-dimensional shape of the aluminum lithium alloy casting is designed using three-dimensional software, and the EPS foam is processed by the machine tool, and the foam model is obtained, the foam model is dipped by dipping liquid paraffin to achieve surface light. deal with.

[0059] (b) Preparation of the surface layer containing inhibitors, specifically includes the following steps:

[0060] 1) Mix 200 destinations of LiCl and LIFs are mixed in a ratio of mass ratio 3: 1, adding to 200 mesh aluminum-soil powder, the weight of LiCl + LIF is 3 wt.% Of the aluminum bauxite powder. The mixed uniform batch was added to the alkaline silica sol in a solid content of 30%...

Example Embodiment

[0086] Example 2

[0087] (a) Preparation model

[0088] Specifically, the following steps: First, the three-dimensional shape of the aluminum-lithium-alloy castings and the mold of the aluminum lithium alloy castings are used to design the liquid paraffin to enter the mold, and then remove the paraffin model of the aluminum lithium alloy castings to be produced.

[0089] (b) Preparation of the surface layer containing inhibitors, specifically includes the following steps:

[0090] 1) Mix 200 destination KCL and LIF in a proportion of mass ratio 2: 1, added to 200 mesh zirconium powder, the weight of KCl + LIF is 3 wt.% Of zirconin powder. The mixed uniform batch was added to a zirconium sol with a solid content of 30%, and a powder was applied to the end of the powder, and the powder ratio was 3.5.

[0091] 2) After the powder is completely added to the zirconium sol, then add fat alcohol polyoxyethylene ether (JFC) as a wetting agent, hydroxymethylcellulose as a suspending agent...

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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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