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Method for preparing superhard ZrxCrCoFeNi high-entropy alloy coating on surface of zirconium alloy

A high-entropy alloy and zirconium alloy technology, applied in the coating process and coating of metal materials, can solve the problems of uneven composition, high cost, high brittleness, etc., and achieve good ductility, improved hardness and good plasticity.

Active Publication Date: 2020-05-12
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The development and preparation of high-entropy alloy bulk materials are limited by the shortcomings of high cost, uneven composition, and high brittleness. Try to design and prepare high-entropy alloy coatings on the surface of bulk metal materials to achieve significant improvements in their surface properties. , unpredictable and challenging

Method used

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  • Method for preparing superhard ZrxCrCoFeNi high-entropy alloy coating on surface of zirconium alloy
  • Method for preparing superhard ZrxCrCoFeNi high-entropy alloy coating on surface of zirconium alloy
  • Method for preparing superhard ZrxCrCoFeNi high-entropy alloy coating on surface of zirconium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Select the prepared 12×18×2mm Zr702 alloy sample, first use 400#, 800#, 1000#, 1200#, 2000# and 3000# sandpaper to polish the sample until it is bright, and rotate 90° each time the sandpaper sample with different values ​​is changed. °. After the sample was polished, it was cleaned with absolute ethanol, and finally its surface was dried. Place the sample after cleaning the surface on a special carrier, and use PVA organic solvent to mix metal powders composed of Cr, Co, Fe, Ni (Co, Cr, Fe, Ni have the same mole fraction) into a paste , evenly coated on the surface of the workpiece, and then dried in a drying oven. The process parameters of the coating preset treatment are: PVA organic solvent concentration 6wt.%, coating preset thickness 1000-1200μm, drying temperature 120°C, drying Time 8h.

[0029] Clamp the dried sample on a special fixture, put it into the working station of the pulse laser equipment, and use argon with a purity of 99.9% as the shielding gas. S...

Embodiment 2

[0032]Select the prepared 12×18×2mm Zr702 alloy sample, first use 400#, 800#, 1000#, 1200#, 2000# and 3000# sandpaper to polish the sample until it is bright, and rotate 90° each time the sandpaper sample with different values ​​is changed. °. After the sample was polished, it was cleaned with absolute ethanol, and finally its surface was dried. Place the sample after cleaning the surface on a special carrier, and use PVA organic solvent to mix metal powders composed of Cr, Co, Fe, Ni (Co, Cr, Fe, Ni have the same mole fraction) into a paste , evenly coated on the surface of the workpiece, and then dried in a drying oven. The process parameters of the coating preset treatment are: PVA organic solvent concentration 8wt.%, coating preset thickness 1000-1200μm, drying temperature 120°C, drying Time 8h.

[0033] Clamp the dried sample on a special fixture, put it into the working station of the pulse laser equipment, and use argon with a purity of 99.9% as the shielding gas. St...

Embodiment 3

[0036] Select the prepared 12×18×2mm Zr702 alloy sample, first use 400#, 800#, 1000#, 1200#, 2000# and 3000# sandpaper to polish the sample until it is bright, and rotate 90° each time the sandpaper sample with different values ​​is changed. °. After the sample was polished, it was cleaned with absolute ethanol, and finally its surface was dried. Place the sample after cleaning the surface on a special carrier, and use PVA organic solvent to mix metal powders composed of Cr, Co, Fe, Ni (Co, Cr, Fe, Ni have the same mole fraction) into a paste , evenly coated on the surface of the workpiece, and then dried in a drying oven. The process parameters of the coating preset treatment are: PVA organic solvent concentration 10wt.%, coating preset thickness 1000-1200μm, drying temperature 120°C, drying Time 8h.

[0037] Clamp the dried sample on a special fixture, put it into the working station of the pulse laser equipment, and use argon with a purity of 99.9% as the shielding gas. ...

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Abstract

The invention discloses a method for preparing a superhard ZrxCrCoFeNi high-entropy alloy coating on the surface of zirconium alloy. The method comprises the following steps that (1), a zirconium alloy workpiece is polished to be bright, cleaned and dried; (2), Co, Cr, Fe and Ni metal powder with the same mole fractions are mixed into paste through an organic solvent, and the paste is smeared on the surface of the workpiece and then dried; (3), the workpiece obtained after coating preset treatment is subjected to laser surface fusion covering treatment; and (4), the workpiece subjected to laser surface fusion covering treatment is taken out, and the workpiece with the surface with the ZrxCrCoFeNi high-entropy alloy coating is obtained. The high-entropy alloy coating prepared through the method has a dendrite crystal texture structure, the chemical properties such as the surface microhardness and the strength of the obtained workpiece are remarkably improved, and the depth and texture of the hardened layer are slighter and more uniform; and in addition, the technical process is easy and convenient to implement, equipment is simple, economical performance and practicability are achieved, the technology is reliable, the efficiency is high, the quality is stable, and good economic benefits can be achieved.

Description

technical field [0001] The invention relates to the technical field of laser surface cladding treatment for metal material processing, in particular to a method for preparing superhard Zr alloys on the surface of zirconium alloys. x CrCoFeNi high-entropy alloy coating method. Background technique [0002] Laser surface cladding technology, as a high-energy, rapid processing on the surface of the workpiece, makes one or more alloying elements and the metal on the surface of the base material rapidly fused to form a good metallurgical bonding layer to improve the surface properties of the base material. Modern surface modification technology, in recent years, because of its high energy, fast cooling rate, fast and local processing of the workpiece, controllable surface coating thickness of the workpiece, high coating quality, and good bonding with the substrate, it can significantly change the surface of the material. Surface performance and life, and can retain the good perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C30/00
CPCC22C30/00C23C24/106
Inventor 柴林江王月圆向康关浩天麻彦龙直妍沟引宁胡红军
Owner CHONGQING UNIV OF TECH
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