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Silicon-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 softening resistance at high temperature

Inactive Publication Date: 2019-10-08
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 high-temperature softening resistance.

Method used

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

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preparation example Construction

[0029] The present invention also provides a method for preparing a silicon-containing high-entropy alloy coating described in the above technical solution, comprising the following steps:

[0030] Mix Co powder, Cr powder, Cu powder, Fe powder, Mn powder and ferrosilicon powder and perform homogenization treatment to obtain mixed powder;

[0031] drying the mixed powder to obtain a dry powder;

[0032] The dry powder is subjected to plasma cladding on the surface of the substrate to obtain the silicon-containing high-entropy alloy coating.

[0033] In the invention, Co powder, Cr powder, Cu powder, Fe powder, Mn powder and ferrosilicon powder are mixed and homogenized to obtain 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 ...

Embodiment 1

[0042] 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;

[0043] Si is selected as the secondary element, the purity of ferrosilicon powder is greater than 98%, and the particle size is between 100 and 150 mesh;

[0044] Mixed powder ratio, the main element powders Co, Cr, Cu, Fe, Mn are carried out according to the equiatomic ratio of 1:1:1:1:1, after adding the ferrosilicon powder to the main element mixed powder, pour it into the high-energy machine Homogenize. Ball milling parameters: the ratio of ball to material is 10:1, the rotational speed of the ball mill is 200r / min, the ball milling time is 3h, and argon protection is carried out during the ball milling process to obtain mixed powder.

[0045] The mixed powder is dried in a drying oven, the drying process: the temperature is 175° C., and the drying time is 1 hour to obtain a dry powder.

[0046] Pour the dry powder int...

Embodiment 2

[0052] Same as Example 1, the only difference is that the molar ratio of Co, Cr, Cu, Fe, Mn and Si in the silicon-containing high-entropy alloy coating is 1:1:1:1:1:0.4, recorded as CoCrCuFeMnSi 0.4 , the atomic size difference (δ) of the silicon-containing high-entropy alloy coating is 2.48%, and the mixing enthalpy (ΔH mix )-5.98kJ / mol, mixing enthalpy and mixing entropy ratio (Ω) 4.23, valence electron solubility (VEC) 7.89, electronegativity difference (χ) 7.4%.

[0053] Figure 4 For the XRD diffraction pattern of the silicon-containing CoCrCuFeMn high-entropy alloy coating that embodiment 2 makes, by Figure 4 It can be seen that the phase of the coating is mainly composed of FCC phase and BCC phase.

[0054] Utilize Vickers microhardness (load force 300g, holding time 15s) the coating obtained in this embodiment is tested, and the average hardness that obtains coating is 293Hv 0.3 , is the average hardness of the base steel (Q235) (123Hv 0.3 ), the coating wears at ...

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Abstract

The invention provides a silicon-containing high-entropy alloy coating and a preparation method thereof, and belongs to the field of alloy coatings. According to the silicon-containing high-entropy alloy coating and the preparation method thereof, a silicon element is used as a secondary element and also is a gap element to be added into CoCrCuFeMn high-entropy alloy so that the quite good high-temperature softening resistance can be achieved through a gap effect of non-metal elements, then the lattice distortion of the high-entropy alloy of the kind can be increased, a solid solution strengthening effect can be achieved, the silicon element and the main element can also form a silicide to be dispersed in the alloy structure, a dispersion strengthening effect is generated, so that the hardness and the wear resistance of the high-entropy alloy of the kind are improved; the self-fluxing element Si is added so that the fluidity of the alloy in the liquid state can be improved, and then the macroscopic morphology of the surface of the coating is improved; and part of the Si can replace Cr with the large atom radius, so that the lattice distortion effect of the alloy is intensified, then the peak value of the FCC phase in the high-entropy alloy structure is changed, through the addition of the Si, the BCC phase can be converted to the FCC phase in the high-entropy alloy, so that thevolume fraction of the FCC phase is promoted to be increased.

Description

technical field [0001] The invention relates to the technical field of alloy coatings, in particular to a silicon-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 ha...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C30/02
CPCC22C30/02C23C24/103
Inventor 魏仕勇彭文屹张友亮邓晓华谌昀金莹万珍珍
Owner NANCHANG UNIV
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