Abstract
A method for the measurement of the heat transfer coefficient between melt and chill during rapid solidification at about 103°C/s is proposed. Melt of tin with different superheat was dropped and solidified on a cylindrical chill of brass, stainless steel, nickel or chromium plated brass. Average values of the solidification time and the thickness of samples are obtained for each superheat, and then they are extrapolated to zero superheat.
By using these data at zero superheat, the value of heat transfer coefficient for each chill is calculated analytically. The obtained values for chill of brass, stainless steel, chromium plated brass and nickel plated brass are 0.70, 0.28, 0.39 and 0.33 cal/cm2°C/s, respectively. It is shown that the heat transfer coefficient does not depend on the thermal properties of chill materials but presumably on the wettability between melt and chill.
