| Abstract: | The surface tension of liquid iron-30% chromium alloys at 1823 K was determined as a function of sulfur content using the sessile drop technique. The surface tension of iron-30% chromium alloys decreases with increasing sulfur content and the results can be described by the following equation for sulfur mass contents of greater than 21 ppm: γ = 1592 – 178ln(1 + 145aS)mN/m. The contact angle between the droplet and an alumina substrate was also measured and found to decrease from 142° at 21 ppm sulfur activity to 80° at a sulfur activity of 0.53 (related to the standard state with a mass content of 1%). From these measurements the interfacial energy between liquid iron-30% chromium alloys and alumina was calculated using Young's equation. The interfacial tension can be described by the following equation: γ = 2026 – 519ln(1 + 29aS)mN/m. |
