2005 Volume 73 Issue 1 Pages 44-53
Under vertical high gravity field, multi-layered two-dimensional (2D)-dendritic growth of silver-substitution plating was examined. As a result, in the vertical gravity fields up to 145 G, it was clarified that: 1) when the electrode is set in upward-horizontal mode, the dendritic growth is greatly suppressed by increasing gravitational acceleration, yielding a high-density-dendrite layer, 2) such high-density layer is self-organized on the electrode surface together with gravitational-convection cells, and in front of the high-density layer, a low-density layer is formed. 3) when the electrode surface is oriented downward horizontally, suppression of the deposit is hardly observed; a conventional low-density-dendrite layer grows, and 4) when the gravitational acceleration changing with time is applied, a characteristic dendrite layer is observed, which is alternatively stacked by high-density and low-density layers. These results were ascribed to the fact that the convection cells induced by the hydrodynamic instability in a vertical gravity field interact with nonequilibrium fluctuations accompanying dendritic growth.
