Method for preparing porous metallic iron

Abstract

The invention relates to a method for preparing porous metallic iron and belongs to the technical field of preparation of transition metal porous materials. The method is characterized by comprising the following steps of preparing ferric nitrate and a reductant into a solution; acquiring a fluffy porous precursor by virtue of carrying out oxidation-reduction reaction in a liquid phase to release a lot of gas; reducing the porous precursor skeleton to metal iron by virtue of reduction reaction at a certain temperature and time under a reducing atmosphere, consolidating the skeleton by high temperature sintering so that the pore structures of the porous precursor are retained in situ and finally preparing porous metallic iron which has the advantages of good pore structure, adjustable size and uniform distribution. The method is simple in device, short in process flow, high in efficiency and low in cost and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of transition metal porous materials, and in particular relates to a preparation method of porous metal iron. The method has easy-to-obtain raw materials, simple equipment, short process flow, high efficiency and low cost, and is suitable for industrial production. technical background [0002] Porous metal is a new type of functional material with low density and small specific gravity, which is composed of a large number of metal skeletons of a certain scale inside and a large number of pores dispersed in it. Due to the large number of pore structures and large specific surface area inside, it shows many characteristics different from dense metal materials in terms of electricity, magnetism, optics, acoustics, and thermodynamics. At the same time, the network skeleton structure of porous metal makes it have basic metal properties and strength. It can be seen that porous metal has both struct...

AI Technical Summary

Problems solved by technology

Molten metal foaming method and infiltration casting method need to heat metal iron to near or above the melting point, resulting in high cost, which greatly limits its industrial scale production

The powder metallurgy method mainly prepares porous metals by compressing and sintering metal powders of different particle sizes, and relies on the pores between the particles to form pores. The porous materials prepared by this method are generally brittle, which also limits its industrial application. application

The metal electrodeposition method has been industrialized in the preparation of porous nickel, and can also be used to prepare porous iron and other porous metals. However, the electrodeposition of metals on foam templates requires that the plating species have good throwing ability and deep plating ability. Especially in the preparation of microporous metals, so this also brings difficulties to industrial production

Although the sputtering method can prepare porous metals with good pore structure, the conditions are harsh, the equipment is complicated, and the cost is high.