Laser-cladding seven-element high-entropy alloy coating and preparation method thereof

A high-entropy alloy and laser cladding technology, which is applied in the coating process and coating of metal materials, can solve the problem of unstable design process parameters of laser cladding high-entropy alloy coating composition, and the comprehensive performance of the coating cannot be universal Unsatisfactory application, hardness, strength, and wear resistance, etc., to achieve uniform and dense cladding layer, improved performance, and good bonding

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

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Problems solved by technology

[0003] At present, there are relatively few studies on the preparation of high-entropy alloys by laser cladding at home and abroad, and the hardness, strength and wear resistance are not ideal. a new trend of
However, due to the compositional design and control of laser cladding high-entropy alloy coatings and the instability of process parameters, the comprehensive properties of the prepared coatings have not yet been universally applied.

Method used

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  • Laser-cladding seven-element high-entropy alloy coating and preparation method thereof
  • Laser-cladding seven-element high-entropy alloy coating and preparation method thereof
  • Laser-cladding seven-element high-entropy alloy coating and preparation method thereof

Examples

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Embodiment 1

[0026] A method for preparing a seven-element high-entropy alloy coating by laser cladding on a TC4 titanium alloy surface, comprising the following steps:

[0027] (1) The base material titanium alloy (TC 4 ) steel plate wire-cut into a single sample of 52mm×10mm×4mm, polished with 200-mesh and 400-mesh metallographic sandpaper to remove the scale on the surface of the substrate, soaked in 5% NaOH solution for 20min, rinsed with water, took out the sample The sample was placed in an anhydrous ethanol solution for ultrasonic cleaning to remove residual impurities on the surface of the titanium alloy, dried with a hair dryer, and then placed in a 60°C drying oven for drying for 1 hour.

[0028] (2) Al, Co, Cr, Fe, Mo, V, Ti powders with a purity of 99.9% are divided into atomic fractions Al (14.3%), Co (14.3%), Cr (14.3%), Fe (14.3%), After Mo (14.3%), V (14.3%), Ti (14.3%) weighed, carry out ball milling, the parameter of ball milling is ball milling speed 45r / min, ball-mater...

Embodiment 2

[0032] A method for preparing a seven-element high-entropy alloy coating by laser cladding on a TC4 titanium alloy surface, comprising the following steps:

[0033] (1) The base material titanium alloy (TC 4 ) wire cutting into a single piece of 52mm×10mm×4mm sample, and then use 200-mesh and 400-mesh metallographic sandpaper to remove the scale on the surface of the substrate, soak it in NaOH solution with a concentration of 4% for 25min, rinse it with water, and take out the sample Put it in absolute ethanol solution for ultrasonic cleaning to remove residual impurities on the surface of the titanium alloy, blow it dry with a hair dryer, and then put it in a 65°C drying oven for drying. The drying time is 0.8h.

[0034] (2) Al, Co, Cr, Fe, Mo, V, Ti powders with a purity of 99.9% are used according to the mass fraction of Al (15%), Co (11%), Cr (14%), Fe (12%), After weighing Mo (17%), V (15%), T (16%), carry out ball milling, the parameter of ball milling is ball milling s...

Embodiment 3

[0037] A method for preparing a seven-element high-entropy alloy coating by laser cladding on a TC4 titanium alloy surface, comprising the following steps:

[0038] (1) The base material titanium alloy (TC 4 ) wire-cut into a single piece of 52mm×10mm×4mm sample, polished with 200-mesh and 400-mesh metallographic sandpaper to remove the scale on the surface of the substrate, soaked in 6% NaOH solution for 22min, rinsed with water, and took out the sample Put it in absolute ethanol solution for ultrasonic cleaning to remove residual impurities on the surface of the titanium alloy, dry it with a hair dryer, and then put it in a 70°C drying oven for drying. The drying time is 0.6h.

[0039] (2) Al, Co, Cr, Fe, Mo, V, Ti powders with a purity of 99.9% are used according to the mass fraction of Al (16%), Co (14%), Cr (10%), Fe (14%), After Mo (16%), V (15%), T (15%) weighed, carry out ball milling, the parameter of ball milling is ball milling speed 50r / min, ball material ratio 17:1...

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Abstract

The invention discloses a laser-cladding seven-element high-entropy alloy coating and a preparation method thereof, and belongs to the technical field of alloy surface coating modification. High-entropy alloy powder is prepared from Al, Co, Cr, Fe, Mo, V and Ti; a substrate is Ti-6Al-14V(TC4) titanium alloy, the atom fraction of each raw material in the high-entropy alloy powder is Al (10% to 16%), Co (11% to 15%), Cr (9% to 16%), Fe (6% to 15%), Mo (8% to 17%), V (8% to 15%) and Ti (12% to 16%), and the sum of all components is 100%. The high-entropy alloy coating is formed by cladding the prepared alloy powder on the surface of the substrate by a high-energy laser beam emitted from a CO2 laser, the substrate and a cladding layer are metallurgically combined to achieve the purpose of surface modification, thus the hardness, wear resistance and corrosion resistance of titanium alloy are improved, and the service life of the titanium alloy is further prolonged.

Description

technical field [0001] The invention relates to a seven-element high-entropy alloy coating prepared by laser cladding and a preparation method thereof, belonging to the technical field of alloy surface coating modification. Background technique [0002] The traditional alloy design is mainly based on one or two elements, and a small amount of other elements are added to improve the properties of the alloy. Professor Ye Junwei, a Taiwanese scholar in my country, broke through the traditional alloy design model on the basis of studying amorphous alloys, and first proposed the design concept of equimolar multi-component alloys. In 2004, he defined it as a high-entropy alloy. The principal element of a high-entropy alloy is generally Metal elements with n≥5, the content of each main element is 5% to 35%, alloyed according to equimolar ratio or approximately equimolar ratio, with high strength, high hardness, excellent wear resistance and corrosion resistance and other performance...

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 刘洪喜邸英南郝轩弘刘径舟蔺健全
Owner KUNMING UNIV OF SCI & TECH
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