**3.2 Experiment no. 2**

Weight of aluminum = 900 g. Amount of CaCo3 = 30 g.

In first experiment, a satisfactory result was not obtained, so a second experiment will be performed. In this experiment the amount of aluminum was 900 g. The amount of calcium carbonate that was added was 30 g. It was added in three parts. The first part of calcium carbonate was in the mold before pouring aluminum. The second part of calcium carbonate was added when molten aluminum was poured into the mold. The remaining 10 g of aluminum was added at the time of stirring. The stirring time of a molten metal was 67 s. When calcium carbonate was added into molten aluminum, viscosity of aluminum was increased. After stirring, the stirrer was taken out from the mold and was cooled down. After cooling the foam was taken out from the mold. Metallic foam can be cut into pieces with the

**Figure 12.** *Microstructure of metallic foam sample 2. (a) Microstructure of metallic foam; (b) section of metallic foam.*

*Design and Development of Manufacturing System Design for Producing Metallic Foam DOI: http://dx.doi.org/10.5772/intechopen.92879*

help of a wire cut electric discharge machining. The microstructure of metallic foam is given in **Figure 12a** and **b**.
