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

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...

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