|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials Processing Fundamentals
||Effect of BO1.5 Addition on the Thermal Conductivity and the Structure of the CaO-BO1.5-AlO1.5 Mold Flux System
||Sakae Shirayama, Youngjae Kim, Kazuki Morita
|On-Site Speaker (Planned)
Thermal conductivity of the CaO-BO1.5-AlO1.5 mold flux system was measured at above 1500 K by using transient hot-wire method. Composition dependency of the thermal conductivity of the flux was discussed from the aspect of its local structure analyzed by Raman spectroscopy. Under the fixed CaO/AlO1.5 molar ratio of 1.38, addition of BO1.5 resulted in higher thermal conductivity at first. In this region, an increase in 4-coordinated borate structure was observed and expected to provide a network with aluminate. When the concentration of BO1.5 reached about 55mol%, thermal conductivity decreased along with a decrease in AlB3O7 structure. From these results, both BO1.5 and AlO1.5 were considered to behave as a network former at the investigated CaO/AlO1.5 ratio. Furthermore, higher acidity of SiO2 than AlO1.5 was confirmed by comparison to the results for the CaO-BO1.5-SiO2 mold flux system.
||Planned: None Selected