Methods for manufacturing foamable metal bodies
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsJoachim Baumeister, Hartmut Schrader
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Abstract
A method is described for manufacturing foamable metal bodies in which a ture (17) of a metal powder (15) and a gas-splitting propellent powder (16) is hot-compacted to a semifinished product (19) at a temperature at which the joining of the metal powder particles takes place primarily by diffusion and at a pressure which is sufficiently high to hinder the decomposition of the propellent in such fashion that the metal particles form a solid bond with one another and constitute a gas-tight seal for the gas particles of the propellant. The foamable metal body can also be produced by rolling. In addition, a use of the foamable metal body (19) thus produced for manufacturing a porous metal body (21) is proposed.
Claims22
A method for producing foamable metal bodies in which a mixture composed of at least one metal powder and at least one gas-splitting propellant powder is produced and hot-compacted to a semifinished product, comprising hot-compacting the mixture at a temperature at which the joining of the metal powder particles takes place primarily through diffusion and at a pressure which is sufficiently high to hinder the decomposition of the propellant in such fashion that the metal particles are permanently bonded to one another and form a gas-tight seal for the gas particles of the propellant.
A method for producing foamable metal bodies in which a mixture of at least one metal powder and at least one gas-splitting propellant powder is prepared, comprising rolling the mixture at high temperature and at a pressure which is sufficiently high to hinder the decomposition of the propellant in such fashion that the metal particles are in a permanent bond to one another and form a gas-tight seal for the gas particles of the propellant.
A method of producing a foamable metal body, comprising:
- mixing a metal powder and a gas-splitting propellant powder to form a mixture;
- and
- compacting the mixture at a temperature at which the joining of particles of the metal powder takes place primarily through diffusion and at a pressure which is sufficiently high to hinder the decomposition of the propellant such that the metal particles are permanently bonded to one another and form a gas-tight seal for the gas particles of the propellant.
A method of producing a foamed metal body, comprising:
- mixing a metal powder and a gas-splitting propellant powder to form a mixture;
- compacting the mixture at a temperature at which the joining of particles of the metal powder takes place primarily through diffusion and at a pressure which is sufficiently high to hinder the decomposition of the propellant such that the metal particles are permanently bonded to one another and form a gas-tight seal for the gas particles of the propellant;
- removing the heat and pressure from the metal body;
- heating the metal body to a temperature above the decomposition temperature of the propellant to foam the metal body;
- and
- cooling the metal body.
Dependencies are inferred from the claim text.