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High-entropy alloy coating and preparation method thereof

A high-entropy alloy and coating technology, which is applied in the field of laser surface modification of H13 steel, can solve problems such as poor bonding force between coating and substrate, poor wear resistance, and scrapping of perforating needles.

Inactive Publication Date: 2020-10-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the wear size reaches 1mm or more, the perforating needle will be scrapped, which will bring huge losses to the enterprise
However, the hardness of H13 steel is low (about HV300), and its wear resistance is poor. Although the method of electroplating chromium and thermal spraying can improve the wear resistance of H13 steel, the method of electroplating chromium has the disadvantage of thin coating, and the method of thermal spraying The method has the disadvantage of poor bonding between the coating and the substrate, so these methods cannot meet the working requirements under harsh conditions. For this reason, the present invention uses laser cladding to prepare a high-entropy alloy coating on the surface of H13 steel

Method used

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  • High-entropy alloy coating and preparation method thereof
  • High-entropy alloy coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] A CoCrFeMnNiB 0.8 The preparation method of high-entropy alloy coating specifically comprises the following steps:

[0032] (1) Grinding the substrate to remove the oxide layer, and then ultrasonically cleaning it with alcohol.

[0033] (2) Weigh Co, Cr, Fe, Mn, Ni and ferroboron metal powder according to the molar ratio of Co, Cr, Fe, Mn, Ni and boron as 1:1:1:1:1:0.8, and mix them evenly And carry out vacuum ball milling for more than 3h to obtain CoCrFeMnNiB 0.8 High entropy alloy powder.

[0034] (3) the CoCrFeMnNiB of step (2) 0.8 The high-entropy alloy powder is preset on the surface of the pretreated substrate to form a prefabricated layer, and then placed at a temperature of 80°C for 8 hours of constant temperature treatment. Laser cladding obtains a high-entropy alloy cladding layer. The laser power of the laser cladding is 4000W, and the scanning speed is It is 450mm / min, the spot diameter is 4.0mm, the defocus is 20mm, the protective gas is argon, and the...

Embodiment 2

[0042] A CoCrFeMnNiB 0.8The preparation method of high-entropy alloy coating specifically comprises the following steps:

[0043] (1) Grinding the substrate to remove the oxide layer, and then ultrasonically cleaning it with alcohol.

[0044] (2) Weigh Co, Cr, Fe, Mn, Ni and ferroboron metal powder according to the molar ratio of Co, Cr, Fe, Mn, Ni and boron as 1:1:1:1:1:0.8, and mix them evenly And carry out vacuum ball milling for more than 3h to obtain CoCrFeMnNiB 0.8 High entropy alloy powder.

[0045] (3) the CoCrFeMnNiB of step (2) 0.8 The high-entropy alloy powder is preset on the surface of the pretreated substrate to form a prefabricated layer, and then placed at a temperature of 60°C for 6 hours of constant temperature treatment. Laser cladding obtains a high-entropy alloy cladding layer. The laser power of the laser cladding is 3700W, and the scanning speed is It is 350mm / min, the spot diameter is 5.0mm, the defocus is 15mm, the protective gas is argon, and the ...

Embodiment 3

[0047] A CoCrFeMnNiB 0.8 The preparation method of high-entropy alloy coating specifically comprises the following steps:

[0048] (1) Grinding the substrate to remove the oxide layer, and then ultrasonically cleaning it with alcohol.

[0049] (2) Weigh Co, Cr, Fe, Mn, Ni and ferroboron metal powder according to the molar ratio of Co, Cr, Fe, Mn, Ni and boron as 1:1:1:1:1:0.8, and mix them evenly And carry out vacuum ball milling for more than 3h to obtain CoCrFeMnNiB 0.8 High entropy alloy powder.

[0050] (3) the CoCrFeMnNiB of step (2) 0.8 The high-entropy alloy powder is preset on the surface of the pretreated substrate to form a prefabricated layer, and then placed at a temperature of 100°C for 10 hours of constant temperature treatment, and the high-entropy alloy cladding layer is obtained by laser cladding. The laser power of the laser cladding is 4200W, and the scanning speed is It is 500mm / min, the spot diameter is 3.0mm, the defocus is 30mm, the protective gas is...

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Abstract

The invention discloses a high-entropy alloy coating and a preparation method thereof, and belongs to the technical field of laser surface modification. High-entropy alloy powder is prepared from Co,Cr, Fe, Mn, Ni and ferro-boron, wherein the molar ratio of Co to Cr to Fe to Mn to Ni to ferro-boron is 1:1:1:1:1:0.8. The preparation method comprises the steps that Co, Cr, Fe, Mn, Ni and ferro-boron metal powder is evenly mixed and subjected to vacuum ball milling for 3 h or more, and CoCrFeMnNiB0.8 high-entropy alloy powder is obtained; and the CoCrFeMnNiB0.8 high-entropy alloy powder is preset on the surface of a pretreated substrate to form a prefabricated layer, and a high-entropy alloy cladding layer is obtained by laser cladding. According to the high-entropy alloy coating and the preparation method thereof, the cladding layer obtained by laser cladding has good macro morphology, the metallurgical bonding between the coating and the substrate is good, and the characteristics of high hardness, high high-temperature oxidation resistance and the like are achieved.

Description

technical field [0001] The invention relates to a high-entropy alloy coating and a preparation method thereof, belonging to the field of laser surface modification of H13 steel. Background technique [0002] Laser cladding is a new application of laser in the field of surface technology. Compared with other processing technologies, laser cladding has many unique advantages. Small, so the alloy is strengthened, and the wear resistance is greatly improved; due to the small heat input, the deformation of the workpiece is small, the bonding strength between the coating and the substrate is high, the thickness of the coating is adjustable, and the thermal influence on the substrate is small, etc. Research and development activities for laser cladding are therefore quite active in the field of surface treatment. [0003] Different from traditional materials, which are dominated by one element and supplemented by a small amount of elements, high-entropy alloys are newly developed ...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C30/00
CPCC23C24/103C22C30/00
Inventor 刘洪喜蔺健全邸英南刘径舟郝轩弘
Owner KUNMING UNIV OF SCI & TECH
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