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Method for preparing aluminide coating on surface of nickel-based metal through electrophoresis

A base metal, aluminide technology, applied in coatings, electrolytic coatings, electrophoretic plating, etc., can solve the problems of high cost, expensive equipment, difficult to promote in a large area, etc. weak effect

Active Publication Date: 2020-09-01
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to expensive equipment and high cost, the chemical vapor deposition method is not easy to be popularized in a large area
In summary, it is still difficult to find a low-cost, easy-to-operate preparation method for high-purity aluminide coatings

Method used

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  • Method for preparing aluminide coating on surface of nickel-based metal through electrophoresis
  • Method for preparing aluminide coating on surface of nickel-based metal through electrophoresis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In absolute ethanol, add high-purity Al powder with a particle size of 50nm and 500nm in sequence, with a mass concentration of 0.1g / L and 0.3g / L, and ultrasonically disperse evenly; then add polyvinyl carbonate and MgCl 2 , the mass concentrations are 0.1g / L and 0.6g / L respectively, stir to dissolve completely, and obtain the electrophoretic suspension; the high-purity nickel sheet is immersed in the electrophoretic suspension and used as the cathode, and the lead plate is used as the anode for electrophoretic deposition, and the electrophoretic working voltage is 40V , after every 15 seconds of deposition, take it out and dry it before electrophoresis, and repeat the deposition 3 times; after the electrophoresis process, put the nickel sheet into the tube atmosphere furnace, use argon as the protective gas, and raise it to 300°C at a speed of 5°C / min. After 1 hour of heat preservation, heat up to 500°C at a speed of 5°C / min and hold for 0.5 hours, then heat up to 750°C...

Embodiment 2

[0026] In absolute ethanol, add high-purity Al powder with a particle size of 100nm, 200nm and 1um in sequence, with mass concentrations of 0.1g / L, 0.2g / L and 0.6g / L, and high-purity silicon powder with a particle size of 50nm, The mass concentration is 0.1g / L, and the ultrasonic dispersion is uniform; then add polypropylene carbonate and MgCl 2 , the mass concentration is 0.3g / L and 0.8g / L respectively, stir to make it dissolve completely, and obtain the electrophoretic suspension; the high-purity nickel sheet is immersed in the electrophoretic suspension and used as the cathode, and the lead plate is used as the anode for electrophoretic deposition, and the electrophoretic working voltage is 50V , every 16 seconds after deposition, take it out and dry it before electrophoresis, and repeat the deposition 4 times; after the electrophoresis process, put the nickel sheet into the tube atmosphere furnace, use argon as the protective gas, and raise it to 300°C at a speed of 10°C / mi...

Embodiment 3

[0028] In absolute ethanol, add high-purity Al powder with a particle size of 1um, 10um, and 20um in sequence, with a mass concentration of 10g / L, 4g / L, and 1g / L, and ultrasonically disperse evenly; then add polyvinyl carbonate and MgCl 2 , the mass concentrations are 1g / L and 1.6g / L respectively, stir to make it dissolve completely, and obtain the electrophoretic suspension; the high-purity nickel sheet is immersed in the electrophoretic suspension and used as the cathode, and the lead plate is used as the anode for electrophoretic deposition, and the electrophoretic working voltage is 100V. After every 20 seconds of deposition, take it out and dry it before electrophoresis, and repeat the deposition 5 times; after the electrophoresis process, put the nickel sheet into a tube-type atmosphere furnace, use argon as the protective gas, and raise it to 300°C at a speed of 15°C / min. After 1 hour, raise the temperature to 660°C at a speed of 15°C / min and keep it for 1 hour, then rai...

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Abstract

The invention provides a method for preparing an aluminide coating on the surface of nickel-based metal through electrophoresis. The method comprises the following steps that a mixture of high-purityAl powder or aluminum powder and silicon powder of different grain sizes is added into ethyl alcohol, lipid organic matter and MgCl2 are added after uniform ultrasonic dispersion, and electrophoresissuspension is obtained through stirring; a high-purity nickel piece is immersed into the electrophoresis suspension and serves as a cathode, a lead plate serves as an anode, electrophoresis depositionis conducted, the nickel piece is put into a pipe type atmosphere furnace after electrophoresis, heat treatment is conducted under an argon atmosphere condition, cooling is conducted after heat treatment, and then through soaking of diluted hydrochloric acid, washing of ethyl alcohol and drying, the high-purity nickel piece of which the surface is covered with the aluminide coating is obtained. According to the method, through matching of powder of different grain sizes, compactness of the electrophoresis powder layer is improved, then diffusion occurs between electrophoresis powder and nickel directly through high temperature, the aluminide coating is generated, the high-purity aluminide coating is prepared and obtained, the production process is low in cost and easy and convenient to operate, and industrial application and popularization are easy.

Description

technical field [0001] The invention relates to the technical field of metal protective layers, in particular to a method for preparing an aluminide coating by electrophoresis on the surface of a nickel-based metal. Background technique [0002] When high-temperature structural metal materials are used alone in the high-temperature atmosphere they serve, oxidation will inevitably occur, so an anti-oxidation coating needs to be applied for protection. Aluminide coatings are widely used for high-temperature protection of hot-end components of aero-engines and gas turbines due to their ability to form a protective aluminum oxide film at high temperatures. [0003] At present, the conventional preparation methods of aluminide coatings include powder embedding aluminizing method, slurry aluminizing method, electrophoretic aluminizing method, hot dipping method and chemical vapor deposition method. Among them, the powder embedded aluminizing method, the slurry aluminizing method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/02C25D13/22
CPCC25D13/02C25D13/22
Inventor 田礼熙郭子顺王智俊嵇志豪廖志豪
Owner NANCHANG HANGKONG UNIVERSITY
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