The study of metallic foams has become attractive to researchers interested in both scientific and industrial applications. The different production methods have not been widely utilized because of difficult process control and high production costs. A new easily-available agent for metal foaming, calcium carbonate, is suggested in this work. An established ion-exchange method was employed for a novel purposethe coating of calcium carbonate powder with fluoride for wettability enhancement. Effect of coating was considered by the examination of wetting behavior of coated and uncoated CaCO 3 by the Al melt. It was determined that coated carbonate produced metallic foam with density comparable to that of samples treated by titanium hydride (∼ 1 × 10 3 kg·m −3 ) and much less then the density of samples obtained by uncoated carbonate (1.7 × 10 3 kg·m −3 ). It was also observed that coated carbonate ensured aluminum foam with smaller pores (1.1 × 10 −3 m) than when the conventional foaming agent, titanium hydride, is used (1.8 × 10 −3 m). The present study shows that calcium carbonate is highly applicable to foamed metal production.
The effect of the novel foaming agent, calcium carbonate in comparison with the conventional titanium hydride on structure and energy absorbing ability of the aluminium based foams was studied. Mechanical testing Alporas foams of Al and wrought alloy Al-5.5Zn-3Mg-0.6Cu-0.5Mn (similar to alloy 7075) doped by small amount (<0:6 mass%) of Sc and Zr was undertaken under compression with static strain rate of 1:5 Á 10 À3 s À1 . The influence of Ca additive on the cell wall structure and deformation behaviour of two kinds of the foams was recognised. Significant advantages in mechanical performance of the aluminium foams processed with CaCO 3 were found and attributed to fine cellular structure and favourable microstructure of the cell wall material.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.