2002 年 43 巻 7 号 p. 1724-1731
The surface tension of liquid Fe–16 mass%Cr alloys and its wettability with alumina substrate at 1823 K were determined as a function of oxygen activity which was less than 0.0070 using the sessile drop technique. Oxygen was found to be strongly surface active in liquid Fe–16 mass%Cr alloys. The variation of surface tension of Fe–16 mass%Cr alloys with oxygen activity can be described by the following equation: σlg=1750−304ln(1+383aO) mN/m. The addition of 16 mass%Cr to liquid iron caused an increase in the contact angle between the droplet and alumina substrate. The contact angle between liquid Fe–16 mass%Cr–O alloys and an alumina substrate remains almost constant (at about 150°) in the present experimental range of oxygen activity. The interfacial tension between liquid Fe–16 mass%Cr–O alloys and solid alumina, calculated using Young’s equation, can be expressed by the following equation: σsl=2270−315ln(1+298aO) mN/m. The work of adhesion between liquid Fe–16 mass%Cr–O alloys and alumina was virtually constant in the present experimental range of oxygen activity.
