Graphene-high-entropy alloy composite coating and preparation method thereof

A high-entropy alloy and composite coating technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problems of water-cooled wall failure and short service life of water-cooled wall, and achieve heat source energy concentration and good The effect of high temperature oxidation corrosion resistance and good development prospects

Inactive Publication Date: 2021-06-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When high-entropy alloys are used in external thermal power units, water-cooled walls are prone to failure, and the service life of water-cooled walls is short

Method used

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  • Graphene-high-entropy alloy composite coating and preparation method thereof
  • Graphene-high-entropy alloy composite coating and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) According to the molar ratio of 1:2:1:1:2, respectively weigh Co, Cr, Ni, Fe, Cu powders with a particle size range of about 30-50 μm, mix them and put them into a ball mill jar for mechanical alloying change;

[0032] The milling parameter is 300rpm, stop for 10min every 30min, and control the milling time at 60h;

[0033] (2) In the high-entropy alloy powder that completes mechanical alloying, add the graphene that quality is 2% of high-entropy alloy powder and mix, add the dehydrated alcohol of 500mL in every 100g mixed powder, carry out ultrasonic dispersion 5h, then in Vacuum drying at 100°C for 15 hours to obtain GN-CoCr 2 NiFeCu 2 mixed powder;

[0034] Graphene thickness is 3-8nm, particle size is 5-50μm;

[0035] (3) Sandblasting the metal substrate 20 steel and cleaning it;

[0036] Use plasma spraying equipment to spray on the substrate to get GN-CoCr 2 NiFeCu 2 Composite coating;

[0037] Spraying parameters are power 30kW, voltage 60V, current 5...

Embodiment 2

[0042] (1) According to the molar ratio of 1:1:1:1:2, respectively weigh Co, Cr, Ni, Fe, Cu powders with a particle size range of 30-40 μm, mix them and put them into a ball mill jar for mechanical alloying ;

[0043] The ball milling parameters are 400rpm speed, 10 minutes stop every 60 minutes of ball milling, and the ball milling time is controlled at 60h;

[0044](2) In the high-entropy alloy powder that has been mechanically alloyed, add graphene with a mass of 1% of the alloy powder and mix, add 450mL of absolute ethanol to every 100g of mixed powder, perform ultrasonic dispersion for 5h, and then heat the mixture at 100°C Dry under vacuum for 15h to get GN-CoCrNiFeCu 2 mixed powder;

[0045] Graphene thickness is 3-8nm, particle size is 5-50μm;

[0046] (3) Sandblasting the metal substrate 20 steel and cleaning it;

[0047] Use plasma spray equipment to spray on the substrate to get GN-CoCrNiFeCu 2 Composite coating;

[0048] The spraying parameters are power 25kW...

Embodiment 3

[0050] (1) According to the molar ratio of 1:1:1:1:1, respectively weigh Co, Cr, Ni, Fe, Cu powders with a particle size range of 30-40 μm, mix them and put them into a ball mill jar for mechanical alloying ;

[0051] The ball milling parameters are 350rpm rotating speed, every 45 minutes of ball milling, stop for 10 minutes, and the ball milling time is controlled at 60h;

[0052] (2) Add 3% graphene with a mass of 3% of the alloy powder to the mechanically alloyed high-entropy alloy powder, add 500 mL of absolute ethanol to every 100 g of the mixed powder, perform ultrasonic dispersion for 5 hours, and then heat Dry under vacuum for 15 hours to obtain GN-CoCrNiFeCu mixed powder;

[0053] Graphene thickness is 3-8nm, particle size is 5-50μm;

[0054] (3) Sandblasting the metal substrate 20 steel and cleaning it;

[0055] Use plasma spraying equipment to spray on the substrate to obtain GN-CoCrNiFeCu composite coating;

[0056] Spraying parameters are power 35kW, voltage 7...

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Abstract

The invention discloses a graphene-high-entropy alloy composite coating and a preparation method thereof, and belongs to metal surface modification. The method comprises the steps that firstly, Co powder, Cr powder, Ni powder, Fe powder and Cu powder are weighed according to the molar ratio of CoCrxNiFeCuy, the Co powder, the Cr powder, the Ni powder, the Fe powder and the Cu powder are put into a ball milling tank after being mixed, mechanical alloying is conducted, and high-entropy alloy powder is obtained; secondly, graphene is added into the high-entropy alloy powder, uniform mixing is conducted, absolute ethyl alcohol is added into the mixed powder, ultrasonic dispersion is conducted, then drying is conducted, and mixed powder is obtained; and thirdly, the mixed powder is sprayed to a metal matrix through plasma spraying equipment, and the GN-CoCrxNiFeCuy composite coating is obtained. According to the graphene-high-entropy alloy composite coating, the composite coating is compact, crystal grains are small, the interface between the coating and a base body is clear, and the bonding quality is high; and the coating has good high-temperature oxidation corrosion resistance.

Description

technical field [0001] The invention belongs to the field of metal surface modification, in particular to a graphene-high-entropy alloy composite coating and a preparation method thereof. Background technique [0002] With the continuous increase of the service time of domestic and foreign thermal power units and the deep peak regulation of the units, the non-stop accidents of the units are on the rise. Among them, the non-stop accidents caused by the failure of the water wall are very high and increase year by year. Among the failures of the water wall, the high temperature corrosion failure occurs during operation, which cannot be supervised and controlled, and the consequences are the most serious. Therefore, the surface modification of the water wall becomes particularly important. [0003] High-entropy alloys are based on a variety of elements. Generally, there are no less than 5 kinds of elements, and the atomic percentage of each element is 5% to 35%. properties of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06B22F9/04B22F1/00
CPCB22F1/0003B22F9/04B22F2009/041B22F2009/043C23C4/06C23C4/134
Inventor 孙琨于紫舒杨经纬李雪洁杨龙龙
Owner XI AN JIAOTONG UNIV
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