Multi-layer composite mold coating for aluminum-lithium alloy sand casting and coating method thereof

A multi-layer composite, sand casting technology, applied in casting molding equipment, casting molds, casting mold components, etc., to achieve the effect of improving surface quality, uniform and dense coating

Active Publication Date: 2020-05-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that existing coatings are easy to react with lithium elements in aluminum-lithium alloys, the purpose of this invention is to provide a multi-layer composite mold coating for aluminum-lithium alloy sand casting and its coating method, which can avoid The metal liquid is in direct contact with the sand mold, and it can avoid the reaction of lithium element with the mold and coating, and at the same time, it can refine the melt and improve the surface quality of the casting.

Method used

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  • Multi-layer composite mold coating for aluminum-lithium alloy sand casting and coating method thereof

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Embodiment 1

[0038] This embodiment provides a multi-layer composite coating for aluminum-lithium alloy sand casting, the multi-layer composite coating includes an alcohol-based graphite coating, a low-concentration hexachloroethane coating and a high-concentration hexachloroethane alkane coating. The coating method of the multilayer composite coating and the method for preparing aluminum-lithium alloy sand castings thereof are as follows:

[0039] (1) Weigh 1kg of alcohol-based graphite coating, stir and mix evenly.

[0040] (2) Weigh 50 g of hexachloroethane (5%), 30 g of organic bentonite (3%), 300 g of ethanol (30%), and 620 g of ether (62%). Dissolve organic bentonite in ethanol and stir for 10 minutes until it swells fully, then add hexachloroethane into ether and stir for 5 minutes to completely dissolve hexachloroethane in ether, then use manual or mechanical stirring to fully mix the two. into 1kg of low-concentration hexachloroethane paint.

[0041](3) Weigh 300 g of hexachlor...

Embodiment 2

[0049] This embodiment provides a multi-layer composite coating for aluminum-lithium alloy sand casting, the multi-layer composite coating includes an alcohol-based graphite coating, a low-concentration hexachloroethane coating and a high-concentration hexachloroethane alkane coating. The coating method of the multilayer composite coating and the method for preparing aluminum-lithium alloy sand castings thereof are as follows:

[0050] (1) Weigh 1kg of alcohol-based graphite coating, stir and mix evenly.

[0051] (2) Weigh 75g of hexachloroethane (7.5%), 35g of organic bentonite (3.5%), 325g of ethanol (32.5%), and 565g of ether (56.5%). Dissolve organic bentonite in ethanol and stir for 10 minutes until it swells fully, then add hexachloroethane into ether and stir for 5 minutes to completely dissolve hexachloroethane in ether, then use manual or mechanical stirring to fully mix the two. into 1kg of low-concentration hexachloroethane paint.

[0052] (3) Weigh 325g of hexac...

Embodiment 3

[0060] This embodiment provides a multi-layer composite coating for aluminum-lithium alloy sand casting, the multi-layer composite coating includes an alcohol-based graphite coating, a low-concentration hexachloroethane coating and a high-concentration hexachloroethane alkane coating. The coating method of the multilayer composite coating and the method for preparing aluminum-lithium alloy sand castings thereof are as follows:

[0061] (1) Weigh 1kg of alcohol-based graphite coating, stir and mix evenly.

[0062] (2) Weigh 100 g of hexachloroethane (10%), 40 g of organic bentonite (4%), 350 g of ethanol (35%), and 510 g of ether (51%). Dissolve organic bentonite in ethanol and stir for 10 minutes until it swells fully, then add hexachloroethane into ether and stir for 5 minutes to completely dissolve hexachloroethane in ether, then use manual or mechanical stirring to fully mix the two. into 1kg of low-concentration hexachloroethane paint.

[0063] (3) Weigh 350g of hexachl...

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Abstract

The invention discloses a multi-layer composite mold coating for aluminum-lithium alloy sand casting and a coating method thereof. The multi-layer composite coating comprises an alcohol-based graphitecoating, a low-concentration hexachloroethane coating and a high-concentration hexachloroethane coating which are sequentially arranged. The coating method adopts a combination manner of brushing andspraying, the alcohol-based graphite coating is brushed by adopting a brushing method, and the low-concentration hexachloroethane coating and the high-concentration hexachloroethane coating are sprayed by adopting a spraying method, and waited for natural volatilization and drying of the low-concentration hexachloroethane coating and the high-concentration hexachloroethane coating after the tlcohol-based graphite coating is ignited and dried. According to the coating, the hexachloroethane coating is added to react with aluminum lithium alloy melt to form an air film to prevent the alloy liquid from being in contact with a casting mold, and the problem that the high-activity lithium element is easy to react with a binder, a suspending agent, an auxiliary agent and the like in the sand moldand the coating in the aluminum lithium alloy sand mold casting process is solved. Meanwhile, the hexachloroethane coating can also generate a refining effect on the melt, deslagging and degassing are carried out, and the surface quality of the aluminum lithium alloy casting can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a multi-layer composite casting coating for aluminum-lithium alloy sand casting and a coating method thereof. Background technique [0002] Lithium is the lightest metal element in nature, its density is only 0.53g / cm 3 . The chemical properties of metal lithium are very active. Under certain conditions, it can react with most metals and non-metals except rare gases. Lithium can react with halogens, and can react with oxygen above 100 ° C to produce lithium oxide, oxygen group Other elements can also react with lithium at high temperature to form corresponding compounds. Lithium and carbon form lithium carbide at high temperature, and easily react with hydrogen near the melting point to form lithium hydride. At the same time, lithium can undergo lithiation reaction with organic matter, and the hydrogen in the organic compound is replaced by lithium. Aluminum-lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C23/02
CPCB22C3/00B22C23/02
Inventor 钟晓祥张亮吴国华刘文才张小龙丁文江
Owner SHANGHAI JIAO TONG UNIV
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