AN ANALYSIS OF THE RIBBON FORMATION PROCESS BY THE SINGLE ROLLER RAPID SOLIDIFICATION TECHNIQUE

The mechanism is dominantly by momentum transport. When the heat transfer coefficient between the liquid sample and the substrate becomes as large as 4. 2x10**5 W/(m**2K), the cooling rate of a ribbon may decrease by almost one order of magnitude from the substrate side to the free surface side. When the heat transfer coefficient becomes large, thickness of ribbon decreases due to the viscosity increase within the flow boundary layer.