Water‐CaO‐Al₂O₃ Join Interaction: Crystallization Behavior Investigation Using the Single Hot Thermocouple Technique (SHTT)

Abstract

Calcium aluminate system is widely used in several ceramic and metallurgical materials and processes such as tundish and mold slags for continuous casting process. In the case of mold powders, they play significant role during the steel solidification process and knowing its physicochemical properties is crucial in the study of slag behavior. In this context, the crystallization tendency of the mold powders plays a significant role in essential properties such as viscosity-which is fundamental to the efficiency of the casting process. In the present study, the effect of a water vapor atmosphere on the crystallization behavior of the CaO-Al 2 O 3 join is investigated using the single hot thermocouple technique. Distinct crystallization behaviors in presence of water vapor atmosphere are observed, according to the temperature range. Hindering of crystallization onset occurs at a temperature range above 1150 °C. For the temperature range below 1150 °C, crystallization improvement can be observed. The resulting time-transformation-temperature diagrams show the influence of temperature on the effect of water vapor upon crystallization, denoting the amphoteric nature of water.

The Isothermal and Non‐Isothermal Growth Behaviors of Ca2Nb2O7 in Molten Slag

“…The in situ thermal analyzer consisting of a single hot thermocouple, a light microscope, and a photographic system is applied to study the growth behaviors. [22][23][24][25][26] The in situ thermal analyzer can vividly study the crystal growth behaviors and crystal growth velocity. [27][28][29] And the in situ thermal analyzer is useful in the co-growth of crystals with two different morphologies.…”