A method for preparing micro-porous metal copper blocks by dealloying copper-iron alloys

A technology of dealloying, copper-iron alloy, applied in the field of porous metal materials, can solve the problems of low strength, low specific surface area of ​​large-pore porous metal, and difficulty in bulking nano-porous metal copper, and achieves low cost and positive engineering application value. , the effect of controllable porosity

Active Publication Date: 2017-11-17
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: for the shortcomings of the large-pore porous metal prepared by the existing traditional foaming method that the specific surface area is too low and the difficulty of bulking and low strength of the nano-porous metal copper prepared by the dealloying method Insufficient and defective, provide a kind of copper-iron alloy adopts the method for preparing micron porous metal copper material by dealloying method, so that porous metal copper block can be prepared, and has higher mechanical strength

Method used

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  • A method for preparing micro-porous metal copper blocks by dealloying copper-iron alloys
  • A method for preparing micro-porous metal copper blocks by dealloying copper-iron alloys
  • A method for preparing micro-porous metal copper blocks by dealloying copper-iron alloys

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Experimental program
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Effect test

Embodiment 1

[0037] The 1 μm copper powder with a purity of ≥99.0% and the 6 μm iron powder with a purity of 99.5% are weighed at an atomic ratio of 25:75, and the element powder is ball milled on a light low-energy ball mill at a speed of 240 rpm for 24 hours to make the composite powder Mix evenly; the composite powder is sintered in PAS (plasma activated sintering) under low pressure vacuum hot pressing, the vacuum degree is ≤10Pa, the sintering temperature is 800°C, the heating rate is 50°C / min, the holding time is 5min, and the sintering pressure is 50MPa. Cu-Fe alloy bulk; the preparation concentration is 5wt% H 2 SO 4 solution, put the clean Cu-Fe alloy into H 2 SO 4 solution, and the container was placed in a water bath and heated to 90°C to keep it warm. Record time. Observe the reaction bubbles of the active metal iron and the sulfuric acid solution in the container, and find that there are no more bubbles in the solution after 15 hours, then take out the metal block and wash...

Embodiment 2

[0039] The 1 μm copper powder with a purity of ≥99.0% and the 6 μm iron powder with a purity of 99.5% are weighed at an atomic ratio of 25:75, and the element powder is ball milled on a light low-energy ball mill at a speed of 240 rpm for 24 hours to make the composite powder Mix evenly; the composite powder is sintered in PAS (plasma activated sintering) under low pressure vacuum hot pressing, the vacuum degree is ≤10Pa, the sintering temperature is 600°C, the heating rate is 50°C / min, the holding time is 5min, and the sintering pressure is 50MPa. Cu-Fe alloy bulk; the preparation concentration is 5wt% H 2 SO 4 solution, put the clean Cu-Fe alloy into H 2 SO 4 solution, and the container was placed in a water bath and heated to 90°C to keep it warm. Record time. Observe the reaction bubbles of the active metal iron and the sulfuric acid solution in the container, and find that there are no more bubbles in the solution after 15 hours, then take out the metal block and wash...

Embodiment 3

[0041] The 1 μm copper powder with a purity of ≥99.0% and the 6 μm iron powder with a purity of 99.5% are weighed at an atomic ratio of 25:75, and the element powder is ball milled on a light low-energy ball mill at a speed of 240 rpm for 24 hours to make the composite powder Mix evenly; the composite powder is sintered in PAS (plasma activated sintering) under low pressure vacuum hot pressing, the vacuum degree is ≤10Pa, the sintering temperature is 1000°C, the heating rate is 50°C / min, the holding time is 10min, and the sintering pressure is 50MPa, and the obtained Cu-Fe alloy bulk; the preparation concentration is 5wt% H 2 SO 4 solution, put the clean Cu-Fe alloy into H 2 SO 4 solution, and the container was placed in a water bath and heated to 90°C to keep it warm. Record time. Observe the reaction bubbles of active metal iron and sulfuric acid solution in the container, and find that there are no more bubbles in the solution after 24 hours, then take out the metal blo...

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Abstract

The invention relates to a method for preparing micrometer porous metal copper blocks by dealloying of copper-ferrum alloy. According to the method, plasma is adopted to activate and sinter copper-ferrum alloy, and then ferrum in the alloy is selectively corroded by utilizing a chemical dealloying method, thus obtaining porous copper blocks with high-strength micrometer apertures. According to the invention, by utilizing the characteristic that the copper-ferrum inter-atom diffusing capacity can be greatly reduced by a quick sintering process of hard miscibility of copper-ferrum alloy, which is lower than the melting point of ferrum, the dimension of a ferrous phase after sintering approaches to the particle size of micron-size material powder, so as to prepare the copper-ferrum bi-continuous three-dimensional net structured copper-ferrum alloy; the particle size of adopted copper powder is slightly smaller than that of ferrous powder, so as to form a structure that copper particles wrap ferrous particles, thus being favorable for ensuring the uniformity of aperture after corrosion; the pore structures of the porous metal copper blocks are regulated and controlled by changing the ferrous powder content and the particle size distribution; according to the process, the high-strength micrometer porous copper blocks with uniform pore distribution and adjustable pore size and porosity can be obtained; and the method has the advantages of being simple in process, low in cost and strong in practicability.

Description

technical field [0001] The invention belongs to the technical field of porous metal materials, and in particular relates to a method for preparing a micron porous metallic copper block by dealloying copper-iron alloys. Background technique [0002] Porous metal has the characteristics of low relative density, high specific strength, large specific surface area, strong permeability, and good energy absorption. It is a multifunctional material integrating mechanical, thermal, acoustic, and electrical properties. Therefore, porous metals have abundant application fields, such as shock absorbers, filters, heat dissipation media, catalyst supports, sensors, etc. There are many preparation methods for porous metals, and the more attractive preparation methods currently include melt foaming method, template method, electrochemical deposition method and so on. The template method uses the filterable material as a template, mixes it with metal powder and sinters or mixes it with liq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C3/00B22F3/11
CPCB22F3/114B22F2998/10C22C3/00B22F1/0003B22F3/105
Inventor 沈强邹丽杰陈习陈斐李俊国张联盟
Owner WUHAN UNIV OF TECH
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