摘要：

A sessile drop investigation on the kinetics of carbon dissolution from an alumina-carbon composite (75 percent C, 25 percent alumina) and a commercial refractory (28.3 percent C, 66.67 percent alumina, 5 percent binder) into liquid iron at 1600 deg C is reported. Carbon dissolution from refractory substrates was very slow reaching 0.84 percent C and 0.1 percent C, respectively after 60 minutes. Both substrates also showed poor wettability. Experimental studies were supplemented with atomistic Monte Carlo simulations to investigate the influence of composition, temperature and melt'turbulence. High carbon systems (100 percent C and 75 percent C, balance alumina) were affected by both temperature and melt turbulence to some extent; increased levels of melt turbulence/higher temperatures had no influence on low carbon (30 percent C) system. While mass transfer was the dominant rate controlling mechanism for high carbon systems, poor wettability of alumina with liquid iron and its significant influence on inhibiting the penetration of liquid iron in the refractory matrix was found to be the dominant rate controlling factor for low carbon refractories.

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