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Boron-containing high-entropy alloy coating and preparation method thereof

A high-entropy alloy and coating technology, applied in metal material coating process, coating and other directions, can solve problems such as poor hardness of high-entropy alloy coating, improve surface morphology, reduce inclusion and oxygen content, The effect of increasing hardness

Inactive Publication Date: 2019-09-24
NANCHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, high-entropy alloy coatings designed based on high-entropy alloys generally have the problem of poor hardness.

Method used

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  • Boron-containing high-entropy alloy coating and preparation method thereof
  • Boron-containing high-entropy alloy coating and preparation method thereof
  • Boron-containing high-entropy alloy coating and preparation method thereof

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preparation example Construction

[0026] The present invention also provides a method for preparing a boron-containing high-entropy alloy coating described in the above technical solution, comprising the following steps:

[0027] Co powder, Cr powder, Cu powder, Fe powder, Mn powder and ferroboron powder are mixed and homogenized to obtain mixed powder;

[0028] drying the mixed powder to obtain a dry powder;

[0029] The dry powder is subjected to plasma cladding on the surface of the substrate to obtain the boron-containing high-entropy alloy coating.

[0030] The invention mixes Co powder, Cr powder, Cu powder, Fe powder, Mn powder and ferroboron powder and performs homogenization treatment to obtain the mixed powder. In the present invention, the particle size of the Co powder, Cr powder, Cu powder, Fe powder and Mn powder is independently preferably 80-200 mesh, more preferably 100-150 mesh, and the Co powder, Cr powder, Cu powder , the purity of Fe powder and Mn powder are preferably greater than 99.9%...

Embodiment 1

[0039] Co, Cr, Cu, Fe, Mn as the main element powder, the purity of the powder is greater than 99.9%, and the particle size is between 100 and 150 mesh;

[0040] Select B as the secondary element powder, and B is added in the form of ferroboron powder (the mass fraction of each element in the ferroboron powder is: 20% B, 0.5% C, 4.0% Si, 0.2% P, 0.5% Al, and the balance Fe) , the purity of the powder is greater than 98%, and the particle size is between 100 and 150 mesh;

[0041] Mixed powder ratio, after the main element powders Co, Cr, Cu, Fe, Mn are mixed, the ferroboron powder is added to the main element mixed powder, and then poured into a high-energy machine for homogenization treatment, so that Co, Cr, Fe, and Mn in the final coating The molar ratio of Cr, Cu, Fe, Mn and B is 1:1:1:1:1:0.1. Ball milling parameters: the ball-to-material ratio is 10:1, the ball mill speed is 200r / min, the ball milling time is 2h, argon protection is carried out during the ball milling p...

Embodiment 2

[0048] Co, Cr, Cu, Fe, Mn as the main element powder, the purity of the powder is greater than 99.9%, and the particle size is between 80 and 200 mesh;

[0049] Select B as the secondary element powder, and B is added in the form of ferroboron powder (the mass fraction of each element in the ferroboron powder is: 20% B, 0.5% C, 4.0% Si, 0.2% P, 0.5% Al, and the balance Fe) , the purity of the powder is greater than 98%, and the particle size is between 80 and 200 mesh;

[0050] Mixed powder ratio, after the main element powders Co, Cr, Cu, Fe, Mn are mixed, the ferroboron powder is added to the main element mixed powder, and then poured into a high-energy machine for homogenization treatment, so that Co, Cr, Fe, and Mn in the final coating The molar ratio of Cr, Cu, Fe, Mn and B is 1:1:1:1:1:0.4. Ball milling parameters: the ratio of ball to material is 10:1, the rotational speed of the ball mill is 100r / min, the ball milling time is 4h, and argon protection is carried out du...

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Abstract

The invention provides a boron-containing high-entropy alloy coating and a preparation method thereof, and belongs to the field of alloy coatings. Some B atoms are adopted as self-fluxing atoms to be subjected to solid solution in a solid solution body of the face-centered cubic structure, the hardness of the coating is improved, granular and short rod-like M2B hard phases are separated out in a coating base, and due to separation of the hard phases, one one hand, the dispersion strengthening effect is achieved; on the other hand, the solid solution reinforcing effect is lowered, the coating hardness is lowered, and due to the hardness improving effect of dispersion strengthening, solid phase strengthening is greatly offset, the influence of the coating hardness is lowered, finally, the coating hardness is still improved, and a boron element is adopted as a secondary element to be added into high-entropy alloy; due to the gap effect of non-metal elements, the alloy stacking fault energy is improved, lattice deformation is increased, the solid solution strengthening effect is achieved, the non-metal element and the main element can form borides to be dispersed into alloy tissue, the dispersion strengthening effect is generated, and therefore the hardness and corrosion resistance of the high-entropy alloy are improved.

Description

technical field [0001] The invention relates to the technical field of alloy coatings, in particular to a boron-containing high-entropy alloy coating and a preparation method thereof. Background technique [0002] Metals and their alloys have a long history. In 2004, Cantor et al. proposed a new alloy design concept, and called such alloys multicomponent alloys and high entropy alloys. Unlike traditional alloys, high-entropy alloys are not based on one or two elements. In terms of composition, they contain at least five main elements, and the atomic ratio of each element is between 5% and 35% (at%). ; From the perspective of entropy, the mixing entropy of alloys includes atomic vibration entropy, magnetic moment entropy, electron random entropy and atomic arrangement entropy, among which atomic arrangement entropy is dominant. Entropy can only consider the entropy of atomic arrangement, that is, △S=Rlnn, when △S>1.5R, it is a high-entropy alloy. High-entropy alloys have...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C30/02
CPCC22C30/02C23C24/106
Inventor 魏仕勇彭文屹邓晓华谢仕芳付青峰谌昀金莹
Owner NANCHANG UNIV
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