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Method for generating composite oxide nanotube array on high-entropy alloy surface

A technology of nanotube arrays and composite oxides, which is applied in the field of surface treatment of composite oxide nanotube films on the surface of high-entropy alloys, can solve the problems that oxide nanotubes have not been reported, and achieve simple equipment, simple operation, and maintenance The effect of completeness

Active Publication Date: 2016-06-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the preparation of oxide nanotubes based on high-entropy alloys has not been reported.

Method used

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  • Method for generating composite oxide nanotube array on high-entropy alloy surface
  • Method for generating composite oxide nanotube array on high-entropy alloy surface
  • Method for generating composite oxide nanotube array on high-entropy alloy surface

Examples

Experimental program
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Effect test

Embodiment 1

[0044] TaNbHfZrTi high-entropy alloy was melted by arc, and sucked into a 10×10mm water-cooled copper mold, the obtained high-entropy alloy rod was sucked, filled with argon gas to seal the tube, and then homogenized at 1400°C for 24h. figure 1 and figure 2 The XRD patterns and EBSD patterns of the prepared high-entropy alloys are respectively. It can be seen that the matrix alloy used is a typical BCC high-entropy alloy. Wire-cut to get 10×10×1mm slices, which are connected to copper wires and finally sealed together in a cold insert. The cold mount samples were carefully ground with 240#, 800#, 1000#, 2000# metallographic sandpaper in turn, ultrasonically cleaned with absolute ethanol, methanol, isopropanol and deionized water for 10 minutes each, and placed in N 2 Dry the surface of the sample in a stream of air.

[0045] Anodizing process: 1M (NH 4 ) 2 SO 4 +0.5wt%NH 4 F is the solute, water is used as the solvent, the oxidation voltage is 70V, the oxidation time i...

Embodiment 2

[0048] Using the same method, a typical FCC high-entropy alloy FeCoNiCrMn is selected, and the electrolyte is 0.35wt%NH 4 F + 3.0% deionized water in ethylene glycol solution, under the conditions of heating in a water bath at 60°C, the voltage is 40V, the oxidation time is 10h, and anodic oxidation is carried out. Similarly, regular composite oxide nanotube arrays with a length of about 10 μm can be obtained.

Embodiment 3

[0050] Using the same method, select the typical HCP high-entropy alloy ScYLaTiZrHf, and select the electrolyte as 1.0mol / L (NH 4 ) 2 SO 4 +0.1mol / LNH 4 F is the solute, water is used as the solvent, the voltage is selected as 80V, the oxidation time is 8h, and anodic oxidation is performed, and a regular array of composite oxide nanotubes with a length of about 20 μm can also be obtained.

[0051] The results of the examples show that choosing a suitable electrolyte, suitable oxide voltage, oxidation time and oxidation temperature, whether it is a high-entropy alloy with a BCC structure, a high-entropy alloy with an FCC structure, or a high-entropy alloy with an HCP structure Entropy alloys can generate composite oxide nanotube films on their surfaces. This is also the first time that high-entropy alloys have been used to prepare composite oxide nanotube arrays. Moreover, the prepared oxide nanotubes have exceptionally high thermal stability. Therefore, the nanotube oxid...

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Abstract

The invention relates to a method for generating a composite oxide nanotube array on the high-entropy alloy surface. The method includes the steps that a high-entropy alloy is subject to anodic oxidation after surface pretreatment is carried out, the oxidation voltage and the oxidation time are changed, and composite oxide nanotubes with different diameters and different thicknesses can be generated on the high-entropy alloy surface. After the prepared composite oxide nanotubes are subject to high-temperature heat treatment, amorphous type nanotube crystallization is carried out; and meanwhile, the heat stability of the nanotube array is high, and the complete nanotube array morphology can be kept after high-temperature heat treatment. The composite oxide nanotube array prepared through the high-entropy alloy has the higher heat stability, and can be applied at a higher temperature, for example, high temperature catalyzing, high temperature gas sensitivity and the like can be achieved. In this way, thin films of the generated composite oxide nanotubes will have a great promotion effect on expanding the application of the high-entropy alloy.

Description

technical field [0001] The invention relates to the technical field of surface treatment, specifically a surface treatment method for generating a composite oxide nanotube film on the surface of a high-entropy alloy by anodic oxidation. Background technique [0002] In recent years, a brand-new alloy design concept has attracted more and more attention in the material science community, that is, high-entropy alloys. It breaks through the traditional alloy design concept. The alloy is designed in the form of equiatomic ratio or close to equiatomic ratio. This unique alloy design concept makes high-entropy alloys have a series of excellent properties. Such as high strength, high hardness, high friction resistance, high thermal stability, and good corrosion resistance. It is precisely because of the unique microstructure and unique properties of high-entropy alloys that their application prospects are very broad. There are many high-entropy alloys currently developed, mainly ...

Claims

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Application Information

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IPC IPC(8): C25D11/02B82Y40/00
CPCB82Y40/00C25D11/02
Inventor 吕昭平雷智锋吴渊王辉刘雄军李睿
Owner UNIV OF SCI & TECH BEIJING
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