| 摘要 |
The invention relates to a process for producing metal foams and to the foamed metal bodies obtained in this way. The process comprises mixing one or more metal powders, if desired combined with particulate metallic or nonmetallic, e.g. mineral, additives of varying particle size, with a gas-liberating blowing agent, if desired, preheating the mixture in an open or closed mold to a temperature below the decomposition temperature of the blowing agent, subsequently heating the mixture to a temperature above the melting point of the lowest-melting metal in such a way that the temperature rises from the equilibrium decomposition temperature of the blowing agent to the melting point of the metal in a time which is shorter than the time required to reach the equilibrium state in the blowing agent/blowing gas system at this temperature and subsequently cooling the resulting metal foam to a temperature below the melting point of the lowest-melting metal.
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