OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 Ta b l e 1 Properties of Developed Metallic Foam No. Volume of Aluminium foam, cm3 Mass of Aluminium foam, gm Density, gm/cm3 Percentage of Porosity, % Relative Density 1 70 130 1.8 32 0.67 Fig. 7. Surface morphology of closed-cell aluminium foam (2.5 % calcium carbonate), observed using FE-SEM, is characterized by interconnected pores The FE-SEM study allows us to estimate the value of the pore size and wall thickness. Pores of different sizes were formed in the resulting aluminium foam, as shown in fig. 8a, b. The largest pore size is 1.43 mm, and the smallest is 0.075 mm. One of the reasons for obtaining an uneven pore size is the nonuniform distribution of the foaming agent in molten aluminium. The uneven porosity of the aluminium foam has led to high internal strength. The distance between the pores varies from 0.40 mm to 1.97 mm. In fig. 8, a, b the resulting wall thickness varies from 0.182 mm to 0.40 mm. а b Fig. 8. Pore size distribution of aluminium foam (a) 25× and (б) 50×
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