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Production Methods for Metallic Foams

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Abstract

The possibilities for making metallic foams or similar porous metal structures are reviewed. The various processes are classified according to the state of the starting metal - liquid, powdered, ionised. Liquid metal can be foamed directly by injecting gas, gas-releasing foaming agents or by producing supersaturated metal-gas solutions. Indirect methods include investment casting and usage of filler materials. Metal powders can also be used as starting materials for metallic foams: mixtures of such powders with foaming agents are compacted to foamable precursor materials that can be foamed in a second step. Instead of foaming agents inert gas can be directly entrapped in the precursor. Metal foams can also be made from metal powder slurries or by using polymer/powder mixtures. Finally, galvanic electro-deposition also allows to make highly porous metallic structures with open pores.

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Authors and Affiliations

  1. Fraunhofer-Institute for Applied Materials Research (IFAM), Lesumer Heerstraße 36, 28717, Bremen, Germany

    J. Banhart & J. Baumeister

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  1. J. Banhart
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  2. J. Baumeister
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Correspondence to J. Banhart.

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Banhart, J., Baumeister, J. Production Methods for Metallic Foams. MRS Online Proceedings Library 521, 121–132 (1998). https://doi.org/10.1557/PROC-521-121

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