On the Viscosity of Liquid Iron

Abstract

The viscosity of liquid iron has been measured by the oscillating crucible method. In a preliminary experiment, it was found that the equation suggested by Knappwost may be related to significant error in the case of liquid iron. In the present experiment, therefore, the analytic expression with three constants based on the Roscoe’s equation was used. The results showed that the temperature dependence of viscosity coefficient of liqiud iron changes at temperatures near 1600°C, i.e., below these temperatures, the viscosity coefficient showed the deviation from the extrapolated values in terms of the Arrhenius plot at higher temperatures. The temperature at which the deviation occurs depends on oxygen concentrations of liquid iron; i.e., this temperature rapidly decreases from 1630 to 1600°C with the increse of oxygen from 40 to 300 ppm.