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Method for preparing three-dimensional network nanoporous copper

A nanoporous copper, three-dimensional network technology, applied in nanotechnology and other directions, can solve the problems of too large pore size of nanoporous copper, failure to obtain nanoporous copper, long dealloying time, etc., to achieve simple operation, suitable for large-scale Industrial production, the effect of shortening the reaction time

Inactive Publication Date: 2012-08-08
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dealloying method of binary alloys is the main method for preparing nanoporous metals. Nanoporous copper has been successfully prepared at present, but the existing preparation techniques have their own shortcomings and deficiencies. J.R.Hayes et al. (J.R.Hayes, A.M.Hodge, J. Biener, A.V.Hamza, et al.J.Mater.Res.2006, 21(10): 2611-2616.), Mn 30 Cu 70 Alloy dealloying, nanoporous copper with a skeleton size of 16-125nm was obtained, but a large number of cracks were found, and the smelting and heat treatment in the process of homogenizing the precursor alloy consumed a lot of energy, the cost was high, and dealloying too long
H B Lu et al. (H.B.Lu, Y.Li, F.H.Wang, Scripta Mater.2007, 56(2):165-168.), using hydrochloric acid solution to electrochemically corrode Zr prepared by magnetron sputtering 38 Cu 62 Alloy film, successfully obtained porous copper with a pore size of 500nm, but the nanoporous copper pore size is too large, and Zr 38 Cu 62 A large amount of Zr remains after dealloying of as-cast alloys, failing to obtain ideal nanoporous copper

Method used

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  • Method for preparing three-dimensional network nanoporous copper
  • Method for preparing three-dimensional network nanoporous copper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In terms of atomic percentage, Mn is 80%, Cu is 20%, and the raw materials are in powder form. Weigh the corresponding quality, mix the weighed powder in a planetary ball mill for 5 hours, then place the mixed material in a copper mold equipped with a copper substrate and press it into a blank under a pressure of 60MPa with a press, Melted into a master alloy in a vacuum arc melting furnace. The alloy is re-melted, and the molten metal is blown out with argon gas at a pressure of 0.5Mpa, and rapidly cooled on a high-speed rotating copper roller to obtain an alloy thin strip with a thickness of about 25μm, a width of 2-4mm, and a length of 10-100mm . After reacting with 0.3mol / L hydrochloric acid solution at room temperature for 4 hours, no air bubbles were generated. Rinse it several times with distilled water, then soak it in distilled water for 4 hours, take it out and put it in a vacuum drying oven for drying. Porous copper with uniform structure can be obtained. ...

Embodiment 2

[0021] In terms of atomic percentage, Mn is 50%, Cu is 50%, and the raw materials are in powder form. Weigh the corresponding quality, mix the weighed powder in a planetary ball mill for 5 hours, then place the mixed material in a copper mold equipped with a copper substrate and press it into a blank under a pressure of 60MPa with a press, Melted into a master alloy in a vacuum arc melting furnace. The alloy is re-melted, and the molten metal is blown out with argon gas at a pressure of 0.5Mpa, and rapidly cooled on a high-speed rotating copper roller to obtain an alloy thin strip with a thickness of about 25μm, a width of 2-4mm, and a length of 10-100mm . After reacting with 0.5mol / L hydrochloric acid solution at room temperature for 8 hours, no air bubbles are generated. Rinse it several times with distilled water, then soak it in distilled water for 4 hours, take it out and put it in a vacuum drying oven for drying. Porous copper with uniform structure can be obtained. T...

Embodiment 3

[0023] In terms of atomic percentage, Mn is 80%, Cu is 20%, and the raw materials are in powder form. Weigh the corresponding quality, mix the weighed powder in a planetary ball mill for 5 hours, then place the mixed material in a copper mold equipped with a copper substrate and press it into a blank under a pressure of 60MPa with a press, Melted into a master alloy in a vacuum arc melting furnace. The alloy is re-melted, and the molten metal is blown out with argon gas at a pressure of 0.5Mpa, and rapidly cooled on a high-speed rotating copper roller to obtain an alloy thin strip with a thickness of about 25μm, a width of 2-4mm, and a length of 10-100mm . After reacting with 0.3mol / L hydrochloric acid solution at 90±5°C for 8 hours, no air bubbles will be generated. Rinse with distilled water several times, then soak in distilled water for 4 hours, take it out and put it in a vacuum drying oven to dry. Porous copper with uniform structure can be obtained. The aperture liga...

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Abstract

A method for preparing three-dimensional network nanoporous copper comprises the following steps of: (1) mixing a Cu powder and a Mn powder with Cu atomic percent being 20-60% and the other being Mn, and carrying out arc melting to form mother alloy; (2) heating the obtained alloy in a bottom open-ended quartz test tube to a molten state, rapidly blowing out the molten alloy by the use of an inert gas, and rapidly solidifying the molten liquid alloy on a copper roller which is rotating at high speed so as to obtain an alloy ribbon; (3) placing the obtained alloy ribbon into an acid or strong acid and weak base salt solution for dealloying, namely placing the alloy ribbon into a hydrochloric acid solution of 0.01-10mol / L to react at 0-99 DEG C for 0.1-100 hours; and (4) repeatedly flushing the three-dimensional network nanoporous copper ribbon obtained after completely dealloying by the use of distilled water until pH value is neutral, carrying out vacuum drying and preserving.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of nanomaterials, in particular to a method for preparing three-dimensional network nanoporous copper. Background technique [0002] Nanoporous copper is mainly used as a catalyst for the water-gas shift reaction and is used in the field of industrial catalysis. Recently, Han et al. (Han R B, Wu H, Wang C L, et al. ) also found that nanoporous copper can serve as a substrate for surface-enhanced Raman scattering. The dealloying method of binary alloys is the main method for preparing nanoporous metals. Nanoporous copper has been successfully prepared at present, but the existing preparation techniques have their own shortcomings and deficiencies. J.R.Hayes et al. (J.R.Hayes, A.M.Hodge, J. Biener, A.V.Hamza, et al.J.Mater.Res.2006, 21(10): 2611-2616.), Mn 30 Cu 70 Alloy dealloying, nanoporous copper with a skeleton size of 16-125nm was obtained, but a large number of cracks were foun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C9/05B22D11/06B82Y40/00
Inventor 周琦吴海涛章新民周全
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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