Nano-porous metal material with gradient changes in aperture and preparation method thereof

A gradient change, nano-porous technology, applied in the field of nano-metal functional materials, can solve the problems of not having a pore structure and a gradient distribution of porosity, and achieve excellent physical and chemical properties, wide application range, and broaden the range.

Active Publication Date: 2013-09-11
四川省新材料工业设计研究院股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore size structure and porosity of the nanoporous metal materials prepared by the dealloying method are uniform, and do not have the characteristics of a gradient distribution of the pore size structure and porosity.

Method used

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  • Nano-porous metal material with gradient changes in aperture and preparation method thereof
  • Nano-porous metal material with gradient changes in aperture and preparation method thereof
  • Nano-porous metal material with gradient changes in aperture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of precursor alloy

[0049] Silver flakes with a purity of 99.99% and zinc particles with a purity of 99.99% are used as raw materials, and the silver flakes and zinc particles are measured according to the atomic ratio of silver to zinc = 25:75.

[0050] Put the measured raw materials into the crucible of the vacuum magnetic induction melting furnace, and evacuate the furnace to a vacuum degree of 5×10 -3 Pa, then fill the furnace with argon all the time, keep the pressure in the furnace at 0.5 atmospheres, energize the crucible to melt the raw materials, cut off the power after 10 minutes of heat preservation, and let the alloy melt naturally cool to room temperature in the crucible to obtain the cast alloy ingot . The as-cast alloy ingot is placed in a tube furnace protected by an argon atmosphere and kept at 550°C for one week. After the holding time expires, it is taken out and rapidly cooled in cold water to obtain a solid solution alloy ingot.

...

Embodiment 2

[0060] (1) Preparation of precursor alloy

[0061] The nickel block with a purity of 99.9% and the electrolytic manganese sheet with a purity of 99.9% are used as raw materials, and the nickel block and electrolytic manganese sheet are measured according to the atomic ratio of nickel to manganese = 45:55.

[0062] Put the measured raw materials into the crucible of the vacuum magnetic induction melting furnace, and evacuate the furnace to a vacuum degree of 5×10 -3 Pa, then fill the furnace with argon all the time, keep the pressure in the furnace at 0.5 atmospheres, energize the crucible to melt the raw materials, cut off the power after keeping it warm for 10 minutes, and let the alloy melt naturally cool to room temperature in the crucible to obtain the cast alloy ingot . The as-cast alloy ingot was placed in a tube furnace protected by an argon atmosphere and kept at 900°C for 48 hours. After the holding time expired, it was taken out and rapidly cooled in cold water to o...

Embodiment 3

[0072] (1) Preparation of precursor alloy

[0073] Cobalt blocks with a purity of 99.99% and aluminum ingots with a purity of 99.9% are used as raw materials, and the cobalt blocks and aluminum ingots are measured according to the atomic ratio of cobalt to aluminum = 4:6.

[0074] Put the measured raw materials into the crucible of the vacuum magnetic induction melting furnace, and evacuate the furnace to a vacuum degree of 5×10 -3 Pa, then fill the furnace with argon all the time, keep the pressure in the furnace at 0.5 atmospheres, energize the crucible to melt the raw materials, cut off the power after 10 minutes of heat preservation, and let the alloy melt naturally cool to room temperature in the crucible to obtain the cast alloy ingot . Put the as-cast alloy ingot in a tube furnace protected by an argon atmosphere and keep it warm at 950°C for 40 hours. When the holding time expires, take it out and quickly cool it in cold water to obtain a solid solution alloy ingot. ...

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Abstract

The invention belongs to the field of nano-metal functional materials and provides a nano-porous metal material. The aperture of the nano-porous metal material changes in a gradient manner along the length direction or the radial direction of the metal material, so that the nano-porous metal material has broad application prospects in electrochemical porous electrodes, catalyst carriers, biomedical filter parts, composite material products and the like. A preparation method of the nano-porous metal material comprises the following steps of: (1) preparing a precursor alloy containing an active metal and an inert metal; (2) coating the precursor alloy in segments or in parts; and (3) performing dealloying treatment by adopting different dealloying conditions in segments or in parts.

Description

technical field [0001] The invention belongs to the field of nano-metal functional materials, in particular to a nano-porous metal material with a gradient change in pore size and a preparation method thereof. Background technique [0002] Gradient porous metal materials with gradient changes in pore size and porosity (or density) distribution have advantages that uniform porous metal materials do not have due to their unique pore structure. In the field of biomaterials, gradient porous materials are more similar to the gradient structure of natural bone, which has a dense outer layer and a looser porous inner layer, and is more in line with the requirements of biological characteristics. It has more advantages as a bone repair material. In the field of food processing, the gradient porous metal membrane is used as a microfiltration membrane and an ultrafiltration membrane, which has higher efficiency and better effect. Gradient metal porous materials have better air permea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08
Inventor 连利仙刘颖方秀梅唐颖
Owner 四川省新材料工业设计研究院股份有限公司
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