改进座滴法测量Fe-0.2S钢与CaO接触角

The contact angle between Fe-0.2S steel with CaO was measured by improved sessile drop method.This method effectively avoids the problem of inaccurate contact angle measurement caused by the reaction between steel sample and substrate during the heating stage,and ensures the steel drop can wet the substrate with a spherical shape.The results show that liquid steel can react with CaO substrate directly by spherical droplets.The initial contact angle between the steel drop and the substrate was 100°,which gradually increased to 123° within 8 minutes and maintained unchanged.SEM-EDS results show that CaS layer with thickness of 50μm was formed at the interface between the steel drops and the substrate,which resulted in the decrease of sulfur content in steel drops and the increase of contact Angle between steel drops and CaO substrate.