Surface Tensions of Fe–(30–40 mol%) Si–C Alloys at 1523–1723 K

Abstract

To analyze the Marangoni effect on fluid flow in an Fe–Si solution during solution growth of SiC, knowledge of the temperature coefficient of surface tension of the solution is essential. In this investigation, the surface tensions of Fe–(30–40 mol%) Si alloys and alloys with added carbon were measured at 1523–1723 K by the maximum bubble pressure method. Surface tensions and temperature coefficients were precisely determined. The measured surface tensions were also compared with estimations based on the modified Butler’s model, and the effect of carbon on the surface tension of Fe–Si–C alloys was assessed.