Method for generating a closed-pore metal foam and component which has a closed-pore metal foam

摘要

A method for generating a closed-pore metal foam and a component in which such a metal foam is used are provided. To form the metal foam having closed pores, the component is provided with a composite of metal particles that may have a layer of a blowing agent. Alternatively the metal and the blowing agent can also be arranged in layers of a sheet, or as a mixture of particles. A heat treatment is the applied whereby the blowing agent liberates a propellant gas, the blowing agent including fullerenes or nanotubes to which the blowing agent is chemically or physically bound. Due to the high temperature stability of the nanotubes or fullerenes, blowing agents may be thereby generated which liberate propellant gas at temperatures of above 1000 DEG C., such that even metals with high solidus temperatures of above 1000 DEG C. may be processed to metal foams.

主权项

1. A method for generating a closed-pore metal foam, comprising:
providing a composite comprising a metal or a metal alloy and a blowing agent comprising blowing agent molecules, the blowing agent molecules having a spherical or tubular structure and comprising at least one of (a) C molecules and (b) B and N molecules, and subjecting the composite to a heat treatment in which the heating is sufficient for the blowing agent to at least one of (a) form a blowing gas and (b) release a blowing gas present in the blowing agent molecules prior to the heat treatment, such that the heat treatment forms closed pores in the composite, wherein the blowing gas is chemically or physically bound to the blowing agent molecules.