Abstract
Alumina ceramics undergo quasi-volcanic corrosion at the melt-air interface, which causing severe damage. However, the growth behaviour of quasi-volcanic corrosion requires further investigation. Here, high-temperature visualisation technology was used to characterise and quantify quasi-volcanic corrosion at the melt-air interface at 1600 °C. An evolution model of the corrosion peak area with changes in the melt compositions was also established. The formation and growth of the corrosion peak is closely related to the temperature, soaking time and the dissolution reaction; quasi-volcanic corrosion occurs at ≥ 1600 °C, and is visibly different from normal corrosion at a three-phase interface. The peak height exhibits competitive evolution with the full width at half maximum of the peak. The obtained evolution of the corrosion peak and relationship between the corrosion area and the C/S ratios of the melts can support for prolonging the service life of alumina ceramics.
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