**3.3 Experiment no. 3**

**3. Experiment**

*Foams - Emerging Technologies*

**3.1 Experiment no. 1**

**3.2 Experiment no. 2**

**Figure 12.**

**98**

Weight of aluminum = 887 g.

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

Amount of CaCo3 = 50 g (approximate).

very low, so it was improved in the next experiments.

The setup that was fabricated, with the use of this setup metallic foam, has been

produced. For producing metallic foam, calcium carbonate is added into liquid aluminum and was stirred. Gases are formed at the time of stirring, and gas is entrapped into the liquid aluminum, and holes (porosity) are created into the aluminum. The foam that was formed can be cooled down, and after cooling the metallic foam can be taken out from the mold. Six experiments were done, and how much amount of aluminum and calcium carbonate can be taken is given below.

This was the first experiment and the amount of aluminum was 887 g. The amount of calcium carbonate added was 50 g (approximate), and after liquid aluminum was stirred and foam was developed. The foam was cooled down, and after cooling metallic foam was taken out from the mold. The porosity of foam was

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

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

Weight of aluminum = 665 g. Amount of CaCo3 = 30 g.

Experiment 3 was not successful because calcium carbonate was directly added into the molten metal at the time of melting. All gases were escaped, and foam was not produced.
