溶鉄と多孔質 MgAl₂O₄ 基板のぬれ性

抄録

  The wettability between porous MgAl₂O₄ substrates and molten iron was investigated by the sessile drop method at 1833 K as a basic study in order to elucidate the interactions between molten iron and a refractory material. For the study, MgAl₂O₄ substrates with 2, 8, 13, 27, and 39% porosity were prepared. The contact angle increased with the substrate porosity. In substrates with 2, 8, and 13% porosity, the contact angles were independent of time. In contrast, for substrates with 27% and 39% porosity, the contact angle decreased during the first hour and then gradually reached a steady value. The decrease in contact angle with time was attributed to the interfacial free energy. The work of adhesion was 1.27 J•m⁻², and it was suggested that the interfacial bond consists of not only a physical bond but also a chemical bond.