Foam iron-nickel composite metal material and preparation method thereof

Abstract

The invention discloses a foam iron-nickel composite metallic material and a preparation method thereof. The foam iron-nickel composite metallic material has a three-dimensional or two-dimensional network structure; and comprises a base layer composed of iron-nickel alloy and a nickel layer above the alloy base layer as a protective layer, wherein the composite metallic material comprises (wt%) nickel 5-29 and iron in balance. The preparation method comprises electroplating iron-nickel alloy on a conducting porous substrate to obtain the iron-nickel alloy base layer, coating nickel layer above the base layer, and performing high-temperature heat treatment to form the protective layer. The inventive foam iron-nickel composite metallic material has reduced nickel consumption, so as to effectively reduce cost; and can replace porous nickel material to be used in battery substrate, electromagnetic shielding, noise absorption, filtration and other fields.

Description

technical field [0001] The invention relates to a porous metal material and a preparation method thereof, in particular to a foamed iron-nickel composite metal material and a preparation method thereof. Background technique [0002] Nickel foam is not only the electrode positive substrate material of the secondary battery, but also used in sound absorption, filtration, electromagnetic shielding and other fields. But for the nickel foam material, due to the large amount of metallic nickel used, the cost of nickel accounts for more than 80% of its manufacturing cost. At present, nickel resources are increasingly scarce, and the price of nickel is soaring. In 2005, it was about 80,000 yuan / ton, and now it is approaching 400,000 yuan / ton, an increase of nearly 5 times. In order to reduce production costs, people are trying to find other cheap metal foam materials to replace nickel foam, such as foam iron, foam iron-based composite materials, etc. [0003] However, due to the h...

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Problems solved by technology

[0003] However, due to the high tensile stress of the pure foam iron material, it is prone to cracking, and its corrosion resistance and oxidation resistance are poor, which is not conducive to long-term storage, transportation and use in industry, so it cannot be used on a large scale.

[0004] The foamed iron-based composite material is a material prepared by coating nickel on the iron matrix layer. Due to the large difference in physical properties of the two metals, iron and nickel, there is a large stress between the two different metal coatings. Therefore, in electroplating The coating is prone to cracking during the process; and because the nickel metal layer cannot completely cover the base iron metal layer, the nickel-iron iron forms a micro-galvanic battery, which accelerates the corrosion of the material, which also makes it impossible to apply on a large scale

[0005] The applicant disclosed a porous iron-nickel alloy material and its preparation method in the patent "windable porous iron-nickel alloy material" (application number 200410022872.4) previously applied for. Although the defects of the above two materials have been overcome, the Nickel still accounts for 30-50% of the total mass of the material, and the amount of nickel used is still relatively large

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