Interfacial Tension and Contact Angle Variations of SUS304 Melt in Contact with Solid Oxides and CaO-SiO_2-Al_2O_3(CaF_2) Slags at 1470 deg C

摘要

Study on the interfacial properties of SUS304 melt in contact with pedestal oxides and also liquid slags of varying chemistry was carried out by using a combination of the sessile drop method and a X-ray fluoroscopic technique at 1470 deg C. Interfacial tension and contact angle were obtained directly from a numerical solution of the Young-Laplace equation. Surface tension of SUS304 was found to be 1467 mN/m in Ar-atmosphere which was considerably lower than that of pure iron. This may be due to the existence of surface active elements such as Cr, Ni and Mn etc. in SUS304. Interfacial tensions of SUS304 in contact with CaO-SiO_2-A1_2O_3(CaF_2) slags were in the range of 925 to 1148 mN/m. The contact angle between SUS 304 and various pedestal was about 120 deg regardless of pedestal oxides, Al_2O_3, TiO_2 and SiO_2. Contact angles between SUS304 and the pedestal alumina coexisting with liquid CaO-SiO_2-Al_2O_3(CaF_2) were in the range of 125 deg to 142 deg.