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Method for preparing nanometer porous copper powder

A nanoporous copper and powder technology, applied in the field of preparation of nanomaterials, can solve the problems of long corrosion time, unfavorable high efficiency, large-scale production, etc., and achieve the effects of shortening corrosion time, reducing pore size, and improving production efficiency

Inactive Publication Date: 2012-02-29
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above method, the precursor alloy is mostly prepared by smelting. The smelting method is beneficial to the preparation of integral continuous porous copper samples, but for catalysts with high specific surface area, there are certain limitations (corrosion time is very long, Not conducive to high efficiency and large-scale production)

Method used

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  • Method for preparing nanometer porous copper powder
  • Method for preparing nanometer porous copper powder
  • Method for preparing nanometer porous copper powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh pure copper and pure aluminum powder (purity ≥ 99.5%, mass ratio) according to the atomic percentage of 32% copper and 68% aluminum, and weigh 30g in total. Adopt zirconia ball mill tank, weigh zirconia balls according to the ball-to-material ratio of 15:1, wherein the mass ratio of the balls with diameters of 10 mm, 6 mm, and 4 mm is 1:1:1, and weigh the grinding aid (stearin acid), its weight is 1% (mass ratio) of the powder.

[0020] (2) Put the powder and balls into the ball mill tank in the order of "ball first, then feed", set the speed of the high-energy ball mill to 300 rpm, stop for 10 minutes every 30 minutes, set the automatic forward and reverse, The ball milling time is 60 hours, and the Al-Cu alloy powder is obtained after the ball milling treatment.

[0021] (3) Prepare a 2M (M=mol / L, the same below) sodium hydroxide aqueous solution with analytical reagents and distilled water, and pass high-purity nitrogen gas for deoxygenation treatmen...

Embodiment 2

[0024] The accompanying drawing is a scanning electron microscope photo of a nanoporous copper sample obtained after Al-Cu alloy powder (Cu atomic ratio is 33.3%) dealloyed in 2M sodium hydroxide solution. The dealloying temperature is 20°C and the reaction time is 40 minute

[0025] (1) Weigh pure copper and pure aluminum powder (purity ≥ 99.5%, mass ratio) according to the atomic percentage of 33.3% copper and 66.7% aluminum, and weigh 30g in total. Adopt zirconia ball mill tank, weigh zirconia balls according to the ball-to-material ratio of 17:1, wherein the mass ratio of 10 mm, 6 mm, and 4 mm diameter balls is 1:1:1, and weigh the grinding aid (stearin acid), its weight is 1% (mass ratio) of the powder.

[0026] (2) Add the powder and balls into the ball mill tank in the order of "ball first, then feed", set the speed of the high-energy ball mill to 350 rpm, stop for 10 minutes every 30 minutes, and set automatic forward and reverse, The ball milling time was 50 hour...

Embodiment 3

[0030] (1) Weigh pure copper and pure aluminum powder (purity ≥ 99.5%, mass ratio) according to the atomic percentage of 35% copper and 65% aluminum, and weigh 30g in total. Adopt zirconia ball mill pot, weigh zirconia balls according to the ball-to-material ratio of 20:1, wherein the mass ratio of 10 mm, 6 mm, and 4 mm diameter balls is 1:1:1, and weigh the grinding aid (stearin acid), its weight is 1% (mass ratio) of the powder.

[0031] (2) Add the powder and balls into the ball mill tank in the order of "ball first, then feed", set the speed of the high-energy ball mill to 250 rpm, stop for 10 minutes every 30 minutes, and set automatic forward and reverse rotation. The ball milling time is 70 hours, and the Al-Cu alloy powder is obtained after the ball milling treatment.

[0032] (3) Prepare 2.5M sodium hydroxide aqueous solution with analytical reagent and distilled water, and pass through high-purity nitrogen gas for deoxygenation treatment for 15 minutes, and ...

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Abstract

The invention discloses a method for preparing nanometer porous copper powder. The method comprises the following steps of: weighing pure copper powder and pure aluminum powder in a ratio of Al-Cu alloy ingredients; adding the pure copper powder, pure aluminum powder and grinding balls into a ball-milling tank, adding a grinding aid, and performing mechanical alloying treatment in a ball-milling machine to obtain Al-Cu alloy powder; and performing dealloying on the obtained Al-Cu alloy powder in alkaline solution, and washing a sample until the sample is neutral to obtain the nanometer porouscopper powder. Precursor alloy is prepared by a mechanical alloying method, and a process is simple; precursor alloy powder has small sizes, so the corrosion time is shortened greatly (within 1 hour generally), and the production efficiency is improved greatly; and the hole size of the prepared nanometer porous copper is only between 15 and 80 nanometers and is reduced greatly, the porous copper is the powdery sample, and a specific surface area is improved greatly.

Description

technical field [0001] The invention relates to a preparation method of nanoporous copper powder, which belongs to the technical field of preparation of nanometer materials. Background technique [0002] Nanoporous metal is a special material with nanometer-sized pores. Its pore size is several nanometers to hundreds of nanometers. The nanoscale pore size makes it have a high specific surface area and other unique physical, chemical and mechanical properties. For example, unique electromagnetic properties, high catalytic activity, high strength, etc. Therefore, nanoporous metals have great application potential, and the current applied research mainly includes catalysis, excitation, sensing, surface-enhanced Raman scattering, etc. Nanoporous copper is a kind of nanoporous metal, which has broad application prospects in the field of catalysis. For example, Raney copper is an important industrial catalyst widely used in water-gas shift reactions. [0003] In 1997, Mellor et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/16B22F9/04
Inventor 王艳张忠华寇天一
Owner UNIV OF JINAN
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