High-hardness high-entropy alloy coating and preparation method and application thereof

A high-entropy alloy and high-hardness technology, which is applied in the field of high-entropy alloys, can solve problems such as low strength and hardness, great influence on wear performance, and poor wear resistance, and achieve good high-temperature wear resistance.

Active Publication Date: 2020-07-03
NANJING INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After research, it was found that CoCrFeMnNi high-entropy alloy with FCC solid solution structure has excellent thermal stability and corrosion resistance, but its strength and hardness are low, and its wear resistance is poor, especially the friction temperature on the wear performance of CoCrFeMnNi high-entropy alloy coating. Greater impact

Method used

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  • High-hardness high-entropy alloy coating and preparation method and application thereof
  • High-hardness high-entropy alloy coating and preparation method and application thereof
  • High-hardness high-entropy alloy coating and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A high-hardness high-entropy alloy coating, the composition and atomic ratio are as follows: CoCrFeMnNiTi x V y , wherein x=0.3~1, y=0.1~1. Preferably, x:y=(0.5˜1):1. Further preferably, x:y=1:1. That is, the composition of the high-entropy alloy coating in this embodiment is: CoCrFeMnNiTiV.

[0041] The CoCrFeMnNi high-entropy alloy powder is spherical, the particle size of the spherical powder is 53-150 μm, and the purity is greater than 99.5wt.%; the Ti powder is spherical or elliptical, the particle size is 19-80 μm, and the purity is greater than 99.9wt.%. Irregular rhombus, the particle size is 5-30 μm, and the purity is greater than 99.9wt.%.

[0042] A method for preparing a high-hardness high-entropy alloy coating, comprising the following steps,

[0043] S01, powder mixing: put the prepared CoCrFeMnNiTiV alloy powder in a mixer for at least 4 hours, and the mixing frequency is 50-100 Hz;

[0044] S02, drying: place the mixed alloy powder in a drying oven...

Embodiment 2

[0072] The difference between this embodiment and embodiment 1 is only:

[0073] A high-hardness high-entropy alloy coating, the composition and atomic ratio are as follows: CoCrFeMnNiTi 0.3 V 0.6 .

[0074] The parameters of the plasma cladding technology are: working current: 130A; working voltage: 25V; plasma arc forward speed: 75mm / min; plasma arc swing speed: 900mm / min; powder feeding rate: 5g / min; ion gas rate: 1.2L / min; powder feeding gas rate: 1.5L / min; protective gas rate: 6L / min; ion gas, powder feeding gas and protective gas are all argon.

Embodiment 3

[0076] The difference between this embodiment and embodiment 1 is only:

[0077] A high-hardness high-entropy alloy coating, the composition and atomic ratio are as follows: CoCrFeMnNiTi 0.6 V.

[0078] The parameters of the plasma cladding technology are: working current: 190A; working voltage: 40V; plasma arc forward speed: 130mm / min; plasma arc swing speed: 1500mm / min; powder feeding rate: 20g / min; ion gas rate: 3.5L / min; powder feeding gas rate: 4.2L / min; protective gas rate: 12L / min; ion gas, powder feeding gas and protective gas are all argon.

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Abstract

The invention discloses a high-hardness high-entropy alloy coating and a preparation method and application thereof. The high-entropy alloy coating comprises the following components and atoms of CoCrFeMnNiTixVy, wherein x = 0.3-1, y = 0.1-1. The high-entropy alloy coating can be applied to a high-temperature-resistant frictional wear material, and particularly can be applied to a milling cutter coating, a high-temperature rotating shaft coating or a high-temperature friction disc coating. The preparation method of the high-entropy alloy coating comprises the steps of powder mixing, drying, pretreatment of a base material and cladding of the coating. The plasma cladding CoCrFeMnNiTiV high-entropy alloy coating prepared through the method is composed of a V-rich BCC1 phase and a Ti-rich BCC2 phase, and the solidification structure of the plasma cladding CoCrFeMnNiTiV high-entropy alloy coating is of a cellular dendritic crystal structure. The average hardness of the CoCrFeMnNiTiV high-entropy alloy coating reaches 942.8 HV0. 3, and is 7.5 times that of matrix Q235 steel.

Description

technical field [0001] The invention relates to a high-hardness high-entropy alloy coating and a preparation method and application thereof, belonging to the technical field of high-entropy alloys. Background technique [0002] The mechanical properties (strength, hardness, thermal stability, corrosion resistance, low-temperature mechanical properties, etc.) and physical properties (magnetic properties) of equiatomic ratio CoCrFeMnNi high-entropy alloys have been studied in depth. After research, it was found that CoCrFeMnNi high-entropy alloy with FCC solid solution structure has excellent thermal stability and corrosion resistance, but its strength and hardness are low, and its wear resistance is poor, especially the friction temperature on the wear performance of CoCrFeMnNi high-entropy alloy coating. Greater impact. [0003] Wear is one of the main causes of component failure. It is of great significance to study the wear law of materials and improve their wear resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C30/00
CPCC23C24/106C22C30/00
Inventor 张保森张显程程江波王章忠朱帅帅俞亚秋张志佳陆雯婷沈天瀛
Owner NANJING INST OF TECH
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