| Title |
The Behavior of Pore Formation in Metal(Al) Foam Foaming by Solubility Element Diffusion Method |
| Authors |
김상열(Sang Youl Kim); 아라이히로시(H. Ari); 허보영(Bo Young Hur) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Ostwald ripening; Metal foam; Pore size; Holding time; Diffusion gas |
| 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. |