Production of particle-stabilized metal foams

Details Production of particle-stabilized metal foams Production of particle-stabilized metal foams

C - Chemistry, Metallurgy

22

C

C22C 1/08 (2006.01) B22D 25/00 (2006.01)

Patent

CA 2087791

ABSTRACT OF THE DISCLOSURE The invention relates to a process for producing a particle-stabilized metal foam from a composite capable of acting as a precursor for the metal foam. The composite is formed by heating a matrix metal, e.g. aluminum or an aluminum alloy, above its liquidus temperature to form a liquid matrix metal, adding to the liquid matrix metal stabilizer particles capable of remaining dispersed within the matrix metal while not being fully wetted by the liquid matrix metal, e.g. MgO particles, and mixing the liquid matrix metal and stabilizer particles under an atmosphere of a gas, e.g. air, in such a way that bubbles of the gas, as well as the stabilizing particles, are dispersed throughout the matrix metal. The composite can then be formed by the introduction of a gas by a known technique to form a particle-stabilized metal foam. The use of stabilizing particles that are not fully wetted by the matrix metal means that lower cost materials and mixing methods can be employed. The entrainment of gas bubbles means that a microporosity is introduced into the composite, which is retained when the composite is transformed into a metal foam.

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