Surface Tension of Molten Silicon Deduced from Wetting Experiments

摘要

The accurate measurements of the surface tension for molten silicon are not easy to be carried out.Themajor problem comes from the fact that it is very difficult to avoid the contamination of silicon surface byoxygen arising from experimental atmosphere or from the starting materials.Indirect determination of thisphysical property for liquid silicon is thus of interests.In the present work,wetting experiments have per-formed for molten silicon on very pure and dense glassy carbon substratc at oxygen partial pressures wellbelow and above the saturation limit of oxygen in the liquid metal.Analyses of the wetting results,togetherwith the experimental results reported in the literature for the surface tension values of molten silicon,ena-ble the surface tension of pure and clean liquid silicon to bc deduced.