Mechanism of Interface Reactions Between Fe-2%Al Alloy and High-Silica Tundish Refractory
Tóm tắt
The reactions between a Fe-2%Al alloy and a high-silica tundish refractory were investigated at 1550 °C in an alumina crucible using a high-frequency induction furnace. The reaction between the dissolved aluminum in the molten alloy and the oxidizing components in the refractory took place at the interface, generating a MgO·Al2O3 spinel as the main product, which was confirmed by both experimental and FactSage™ 7.0 calculated results. Several layers were detected at the interface depending on an aluminum diffusion in the refractory material and the reaction time. However, the formation of MgO·Al2O3 spinel layer at the interface delayed the reduction of silica because aluminum diffusion became very slow through the interfacial layer. The mass transfer coefficient of silicon in the Fe-2%Al alloy was 7.91 × 10−4 m/s. FactSage™ 7.0 calculated results indicated that the content of silicon in the alloy was higher than that of magnesium, as the result of transformation of forsterite phase to MgO·Al2O3 spinel at the interface.
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