Preparation method of porous nickel

Abstract

The invention provides a preparation method of porous nickel. The preparation method is characterized by comprising the steps: melting pure nickel and pure zinc in a crucible by specified proportions to obtain a nickel-zinc alloy melt, adjusting the temperature of the melt to the range from 950 DEG C to 1000 DEG C, casting in a copper mold, and then performing vacuum evaporation on the obtained nickel-zinc alloy to obtain the material, namely the porous nickel material. The method has the advantages of simple process, low environmental pollution, adjustable pore size and porosity and the like.

Description

technical field [0001] The invention belongs to the field of porous metal materials, in particular to a method for preparing porous nickel materials by adopting alloy selective evaporation technology. technical background [0002] Due to the advantages of high strength, adjustable pore shape and size, and energy absorption, porous metals have attracted increasing attention in the fields of chemical industry, automobiles, and aviation. In recent years, the research on porous metals in the field of catalysis is gradually rising. In view of the characteristics of high flow rate catalysis, the selected catalytic materials should have the following characteristics: high content of active substances per unit volume; high purity, low surface pollution, large specific surface area; certain strength to resist the impact of fluid; resistance to the catalyzed fluid Small. Catalytic materials usually supported by inactive substances such as carbon, ceramics, and stainless steel cannot ...

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Problems solved by technology

[0003] Porous nickel, also known as nickel foam and nickel sponge, has a large specific surface area and a relative density of 0.2~0.3, which is about 1 / 4 of water, 1 / 3 of wood, 1 / 10 of aluminum, and 1 / 30 of iron , the material has strong thermal conductivity, and its porous structure has wide-frequency sound absorption characteristics. , electrodeposition method, melt foaming method, spark plasma sintering method, etc. Generally, the porosity of powder sintered porous metal materials is low, the highest can only reach 40%, and the connectivity of the pores is poor, which is difficult to meet the requirements of catalytic applications. Requirements; the porous metal material obtained by loose-pack sintering can reach a porosity of 40% to 60%, but the uniformity and pore size of the pores in the material are difficult to control, resulting in poor consistency between samples; the electrodeposition method can prepare a porosity of up to More than 90% through-hole metal foam, but its specific surface area is small (generally 10m 2 / g or less), the pore characteristics of the sintering method with the addition of pore-forming agents mainly depend on the size and shape of the pore-forming agent used, while the porosity is regulated by the content of the pore-forming agent, but the removal of the pore-forming agent is not sufficient and other problems; the material purity of the foam metal prepared by the melt foaming method is low, and there are a large number of closed cells, and the spark plasma sintering can prepare a porous nickel bulk material with a relatively uniform macrostructure and a porosity of more than 70%. But this method requires high equipment and complicated process

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