| Abstract |
| Metallic foam materials with high porosity were fabricated by melt foaming method. The structure of Al foam has homogeneous distribution of cell size. The pore diameter was increased with increasing holding time at optimum foaming temperature. We have been tried to control pore diameters and cell wall thickness for kinetic analysis by Ostwald ripening. In our experimental results, it was found that there were a closed relationship between radius of developing pores and holding time as 1.5 mm at 120 second, 1.75 mm at 300 second, 2.0 mm at 600 second and 3.5 mm at 1200 second. We can conclude that the evolution process of pore in molten aluminum must be Ostwald ripening. That means that hydrogen diffusion through pore walls from smaller pores to a larger one is the main process of pore evolution at least in the latter period of holding. |
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| Key Words |
| Ostwald ripening, Metal foam, Pore size, Holding time, Diffusion gas |
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