A novel melt processing technique combines some of the advantages of established melt- and powder-route approaches to metallic foam production. It involves preparation of a precursor material by dispersion of gas-generating particles (pre-treated to delay gas release) in a liquid aluminum-based/SiCp composite, followed by solidification. The process provides for flexibility in design of foam structures via control over the amount/kinetics of hydrogen evolution and the drainage processes which occur during foam formation.
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Gergely et al. (2000) studied this question.