Laser cladding AlCoCrFeNi/NbC gradient high-entropy alloy coating material and method

A high-entropy alloy and laser cladding technology, which is applied in the coating process and coating of metal materials, can solve the problems of crack driving force and large residual stress, poor toughness of high-entropy alloy coating, and easy initiation of cracks. Good wear resistance, easy to industrialize, and avoid the effect of sudden change

Pending Publication Date: 2021-01-08
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-entropy alloy coating prepared by this method has poor toughness, crack driving force and residual stress are large, and cracks are easy to initiate, causing the parts to fail

Method used

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  • Laser cladding AlCoCrFeNi/NbC gradient high-entropy alloy coating material and method
  • Laser cladding AlCoCrFeNi/NbC gradient high-entropy alloy coating material and method
  • Laser cladding AlCoCrFeNi/NbC gradient high-entropy alloy coating material and method

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Experimental program
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Effect test

Embodiment 1

[0046] The steps of a preparation method of a laser cladding AlCoCrFeNi / NbC gradient high-entropy alloy coating material are:

[0047] (1) Al, Co, Cr, Fe, Ni elemental powders are selected to be uniformly mixed with NbC with a mass fraction of 0, 10wt%, and 20wt% respectively according to the same atomic ratio; the purity of the metal powder is greater than 99.5%, and the particle size is 100-300 Mesh, the particle size of NbC ceramic particles is 2 μm;

[0048] (2) The mixed powder is prepared by a low-energy ball milling method. The specific steps are as follows: add the mixed powder into the ball milling tank, vacuumize, control the mass ratio of the ball to the material to be 5:1, the rotation speed is 100r / min, and the ball milling time is 2h , Mix the two powders evenly, cool down for 30 minutes after the ball milling, and take out the powder; the ball milling tank used is a vacuum stainless steel tank, and the balls used are stainless steel balls without adding ball mil...

Embodiment 2

[0058] The steps of a preparation method of a laser cladding AlCoCrFeNi / NbC gradient high-entropy alloy coating material are:

[0059] (1) Al, Co, Cr, Fe, Ni element powders are selected to be uniformly mixed with NbC with a mass fraction of 0, 5wt%, and 15wt% respectively according to the same atomic ratio; the purity of the metal powder is greater than 99.5%, and the particle size is 100-300 Mesh, the particle size of NbC ceramic particles is 2 μm;

[0060] (2) The mixed powder is prepared by a low-energy ball milling method. The specific steps are as follows: add the mixed powder into the ball milling tank, vacuumize, control the mass ratio of the ball to the material to be 5:1, the rotation speed is 100r / min, and the ball milling time is 2h , Mix the two powders evenly; the ball mill used is a vacuum stainless steel tank, and the balls used are stainless steel balls without adding ball milling media.

[0061] (3) Pretreating the 45# steel substrate, the specific steps inc...

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Abstract

The invention designs a laser cladding AlCoCrFeNi/NbC gradient high-entropy alloy coating material which comprises a matrix and an AlCoCrFeNi/NbC gradient high-entropy alloy coating. The AlCoCrFeNi/NbC gradient high-entropy alloy coating contains an AlCoCrFeNi high-entropy alloy and NbC ceramic particles; the atomic ratio of each element in the high-entropy alloy is Al: Co: Cr: Fe: Ni = 1: 1: 1: 1: 1; the NbC content in the AlCoCrFeNi/NbC gradient high-entropy alloy coating varies in a continuous gradient way from inner layer to top layer; and the mass percentages of the components are respectively 0 to 5 percent by weight, 5 to 15 percent by weight and 15 to 25 percent by weight. According to the laser cladding AlCoCrFeNi/NbC gradient high-entropy alloy coating material provided by the invention, for the cladding coating prepared on the carbon steel matrix, the surface has high hardness and wear resistance, good metallurgical bonding is achieved between cladding layers and between thecladding layers and the matrix, the toughness of the bonding position is good, residual stress and crack driving force are small, the service life of manufactured parts can be prolonged, and the working condition range can be widened.

Description

technical field [0001] The invention belongs to the field of laser cladding, in particular to a preparation method of an AlCoCrFeNi / NbC gradient coating. Background technique [0002] High-entropy alloys are alloys composed of 5 or more main elements mixed in equal or near-substance amounts. They are usually composed of simple solid solutions, which are not easy to form brittle intermetallic compounds, and can have both high hardness and wear resistance. excellent performance. [0003] Gradient cladding coating can avoid the sudden change of properties between the cladding layer and the substrate by continuously changing the composition of the material, so as to obtain lower stress, defect and fracture tendency. Therefore, the gradient alloy material has a longer service life and a wider range of use. [0004] Application Publication No. CN 107675046 A proposes a light-weight, high-strength aluminum-magnesium-copper high-entropy alloy and a preparation method thereof. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 李晓峰冯英豪陈子健仪登豪王帅谢会起刘斌李忠华赵占勇白培康
Owner ZHONGBEI UNIV
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