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Method for preparing high-entropy alloy composite coating on low-carbon steel surface

A technology of high-entropy alloys and composite coatings, which is applied in metal material coating technology, coatings, metal processing equipment, etc., and can solve the problem of poor bonding between the reinforcement graphene and the substrate interface, "cracking" of the coating, uneven composition, etc. problem, to achieve the effect of high hardness, fast heating speed, and few graphene defects

Inactive Publication Date: 2021-02-19
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a method for preparing a high-entropy alloy composite coating on the surface of low-carbon steel, which solves the problem of poor bonding between the reinforcement graphene and the matrix interface, further reduces the interface energy and makes it more stable; The hardness, strength, corrosion resistance and high temperature stability of steel surface expand its scope of application; it overcomes the problems of insufficient performance in the preparation of high-entropy alloy coatings, coating "cooking", uneven composition, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Cut the size to 10×10×15mm 3 The block low-carbon steel is used as the substrate, the surface of the low-carbon steel is pretreated, the rust on the surface of the part is removed by sanding, and the surface of the low-carbon steel is ultrasonically treated with anhydrous ethanol to remove the oil on the surface.

[0024] The second step: mix the Fe-Mn-Ni-Co-Cr high-entropy alloy according to atomic percentage, 21% of Mn, 29% of Ni, 5.9% of Co, 2.3% of Cr, 41.8% of Fe, and introduce n-heptane Alkane is used as the control agent of the process. After the ball mill tank is sealed, the vacuum is pumped, and the mechanical alloying is carried out on the planetary ball mill. Dry in the oven at 100°C and keep warm for 24 hours to obtain high-entropy alloy powder.

[0025] Step 3: Mix high-entropy alloy powder and graphite at a mass ratio of 9:1, vacuumize the ball mill tank after sealing, and use a planetary ball mill for mechanical alloying again, with a ball-to-mat...

Embodiment 2

[0030]Step 1: Cut the size to 10×10×15mm 3 The block low-carbon steel is used as the substrate, the surface of the low-carbon steel is pretreated, the rust on the surface of the part is removed by sanding, and the surface of the low-carbon steel is ultrasonically treated with anhydrous ethanol to remove the oil on the surface.

[0031] The second step: mix the Fe-Mn-Ni-Co-Cr high-entropy alloy according to atomic percentage, 24% of Mn, 27% of Ni, 5.5% of Co, 2.2% of Cr, 41.3% of Fe, and introduce n-heptane Alkane is used as the control agent of the process. After the ball mill tank is sealed, it is evacuated and mechanically alloyed on a planetary ball mill. Dry in the box at 105°C and keep warm for 24 hours to obtain high-entropy alloy powder.

[0032] Step 3: Mix the high-entropy alloy powder and graphite at a mass ratio of 9:1.1, seal the ball mill tank and evacuate it, then use a planetary ball mill for mechanical alloying again, the ball-to-material ratio is 18:1, and th...

Embodiment 3

[0037] Step 1: Cut the size to 10×10×15mm 3 The block low-carbon steel is used as the substrate, the surface of the low-carbon steel is pretreated, the rust on the surface of the part is removed by sanding, and the surface of the low-carbon steel is ultrasonically treated with anhydrous ethanol to remove the oil on the surface.

[0038] The second step: mix the Fe-Mn-Ni-Co-Cr high-entropy alloy according to atomic percentage, 27% of Mn, 26% of Ni, 5.2% of Co, 2.1% of Cr, 39.7% Fe, and introduce n-heptane Alkane is used as the control agent of the process. After the ball mill tank is sealed, the vacuum is pumped, and the mechanical alloying is carried out on the planetary ball mill. Dry in the box at 110°C and keep warm for 24 hours to obtain high-entropy alloy powder.

[0039] Step 3: Mix the high-entropy alloy powder and graphite at a mass ratio of 9:1.2, vacuumize the ball mill tank after sealing it, and use a planetary ball mill for mechanical alloying again. The ball-to-m...

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Abstract

The invention discloses a method for preparing a high-entropy alloy composite coating on a low-carbon steel surface. The method comprises the following steps: pretreating the low-carbon steel surface,mixing Fe-Mn-Ni-Co-Cr high-entropy alloy according to atomic percent, and carrying out mechanical alloying to obtain high-entropy alloy powder; mixing the high-entropy alloy powder with graphite in amass ratio of 9: (1-1.2), and carrying out mechanical alloying to obtain graphene-coated high-entropy alloy powder to be cladded; evenly mixing the alloy powder to be cladded with a fluxing agent toobtain a mixture and then coating the mixture on the low-carbon steel surface, putting low-carbon steel into a high-frequency induction heating machine to be cladded, melting, cooling and condensing the powder to obtain the high-entropy alloy composite coating. According to the method disclosed by the invention, high-entropy alloy nanoparticles are prepared through the mechanical alloying method,and the graphene is obtained through mechanical stripping of the graphite, so that the high-entropy alloy nanoparticles are coated with the graphene, and the coating obtained through induction heatingcladding has excellent hardness, strength, corrosion resistance and high-temperature stability.

Description

technical field [0001] The invention belongs to the field of preparation of low-carbon steel surface composite materials, and in particular relates to a preparation method of a high-entropy alloy composite coating for improving the surface hardness, strength, corrosion resistance and high-temperature stability of low-carbon steel. Background technique [0002] High-entropy alloy is a new type of multi-component alloy, which is composed of five or more main elements in equiatomic or nearly equiatomic proportions. Due to the high entropy effect, the alloy does not form complex intermetallic compounds, but tends to form a simple solid solution structure. This simple solid solution structure makes high-entropy alloys have high hardness, strength, corrosion resistance and high temperature stability, which has attracted extensive research. At present, the research on high-entropy alloys is mainly focused on isoatomic and near-equiatomic ratios. The high-proportion addition of all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B22F9/04B22F1/02C22C30/00
CPCC23C24/103B22F9/04C22C30/00B22F2009/041B22F2009/043B22F1/16
Inventor 刘和平杨恒喆刘浪浪孙凤儿刘斌荆兴斌裴畅贵
Owner ZHONGBEI UNIV
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