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Preparation method of AlFeCoNiCr high-entropy coating on surface of stainless steel

A stainless steel and coating technology, which is applied in the coating, metal material coating process, etc., can solve the problems of high aluminizing temperature and insufficient density of aluminum coating, achieve short preparation process, promote melting and solidification process, powder and The effect of high energy efficiency

Active Publication Date: 2021-01-29
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current mainstream aluminizing process has problems such as high aluminizing temperature and insufficient density of aluminum coating in the aluminizing of large pipes and the inner wall of the main steam pipe.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1. According to the design composition of the target AlFeCoNiCr high-entropy coating, select Al, Fe, Co, Ni, and Cr powders for material preparation; the design composition of the target AlFeCoNiCr high-entropy coating is calculated as: Al 22 %, Fe22%, Co 18%, Cr 18%, Ni 20%;

[0031] Step 2, using a powder mixer to mix the Al, Fe, Co, Ni, and Cr powders prepared in step 1 to obtain AlFeCoNiCr mixed powder; the speed of mixing is 23 rpm, and the mixing The feeding time is 6h;

[0032] Step 3, adding the AlFeCoNiCr mixed powder obtained in step 2 into the dispersant solution to obtain the AlFeCoNiCr mixed slurry; the dispersant solution is an ethanol solution of polyvinyl butyral with a mass content of 3%; the AlFeCoNiCr mixed The concentration of the slurry is 0.5g / mL;

[0033] Step 4. Apply the AlFeCoNiCr mixed slurry obtained in Step 3 to the surface of G115 steel by brushing process, and dry at 60°C to ob...

Embodiment 2

[0037] This embodiment includes the following steps:

[0038] Step 1. According to the design composition of the target AlFeCoNiCr high-entropy coating, the element powders of Al, Fe, Co, Ni, and Cr are selected for material preparation; the design composition of the target AlFeCoNiCr high-entropy coating is calculated as: Al 18 %, Fe20%, Co 22%, Cr 22%, Ni 18%;

[0039] Step 2, using a powder mixer to mix the Al, Fe, Co, Ni, and Cr powders prepared in step 1 to obtain AlFeCoNiCr mixed powder; the speed of mixing is 25 rpm, and the mixing The feeding time is 4h;

[0040] Step 3, adding the AlFeCoNiCr mixed powder obtained in step 2 into the dispersant solution to obtain the AlFeCoNiCr mixed slurry; the dispersant solution is an ethanol solution of polyvinyl butyral with a mass content of 7%; the AlFeCoNiCr mixed The concentration of the slurry is 0.7g / mL;

[0041] Step 4: Apply the AlFeCoNiCr mixed slurry obtained in step 3 to the surface of 316L stainless steel by brushing...

Embodiment 3

[0045] This embodiment includes the following steps:

[0046] Step 1. According to the design composition of the target AlFeCoNiCr high-entropy coating, the element powders of Al, Fe, Co, Ni, and Cr are selected for material preparation; the design composition of the target AlFeCoNiCr high-entropy coating is calculated as: Al 20 %, Fe18%, Co 20%, Cr 20%, Ni 22%;

[0047] Step 2, using a powder mixer to mix the Al, Fe, Co, Ni, and Cr powders prepared in step 1 to obtain AlFeCoNiCr mixed powder; the speed of mixing is 24 rpm, and the mixing The feeding time is 5h;

[0048] Step 3, adding the AlFeCoNiCr mixed powder obtained in step 2 into the dispersant solution to obtain the AlFeCoNiCr mixed slurry; the dispersant solution is an ethanol solution of polyvinyl butyral with a mass content of 5%; the AlFeCoNiCr mixed The concentration of the slurry is 0.6g / mL;

[0049] Step 4. Apply the AlFeCoNiCr mixed slurry obtained in step 3 to the surface of 304 stainless steel by brushing ...

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Abstract

The invention discloses a preparation method of an AlFeCoNiCr high-entropy coating on the surface of stainless steel. The method comprises the following steps of 1, preparing materials; 2, mixing thematerials; 3, preparing mixed slurry; 4, coating the mixed slurry on the surface of the stainless steel and drying; 5, carrying out pre-sintering to form an AlFeCoNiC pre-sintered coating; and 6, preparing the AlFeCoNiC high-entropy coating on the surface of the stainless steel by adopting an electron beam cladding process. According to the preparation method, a powder pre-sintering method and anelectron beam cladding process are combined, metallurgical bonding of the AlFeCoNiCr high-entropy coating and a stainless steel base body is achieved, the bonding force of the AlFeCoNiCr high-entropycoating and the stainless steel base body is effectively improved, then the abrasion resistance, hardness, oxidation resistance and high-temperature corrosion resistance of the AlFeCoNiCr high-entropycoating on the surface of the stainless steel are improved, and the service life is prolonged. The preparation method is easy to implement and low in cost, and the adaptability of the AlFeCoNiCr high-entropy coating in an extreme environment is improved.

Description

technical field [0001] The invention belongs to the technical field of corrosion-resistant surface coatings, and in particular relates to a preparation method of an AlFeCoNiCr high-entropy coating on a stainless steel surface. Background technique [0002] The installed capacity of supercritical units in my country and the production technology of supercritical units have reached the world's top level. my country plans to develop ultra-supercritical power generation technology with a main steam temperature of 650°C and above in the future. Higher main steam temperatures are more corrosive to stainless steel in supercritical unit boilers, especially the growth rate and shedding of oxide films on high-temperature heating surfaces. The rate is significantly increased, which puts stricter requirements on the stainless steel of the power plant boiler, especially the stainless steel of the superheater and reheater. Therefore, improving the oxidation resistance of stainless steel u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C30/00
CPCC22C30/00C23C24/106
Inventor 李广忠李亚宁王昊
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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