CaO–SiO2 Based Slags

Name: CaO–SiO2 Based Slags
Diagram No.: 1168
Type of diagram: TTT
Chemical composition in weight %: See the table
Group: Slags
Note: TTT curves of mold fluxes: (a) A, (b) B1, (c) B2, (d) B3, (e) incubation time of mold fluxes.
The TTT diagrams of A and B series mold fluxes are shown in Figure 8a–d. In the experiment, the temperature corresponding to the occurrence of 5 vol pct of crystallization is defined as the beginning crystallization temperature, and the end crystallization temperature corresponds to the occurrence of 95 vol pct of crystallization. It can be observed from the Figure 8a–d that there are two noses in each of the TTT curves, indicating two crystallization phases are formed. This is in agreement with the XRD result. Incubation time is an important parameter to characterize crystallization properties, and a shorter incubation time suggests a larger speed of crystal precipitation. Figure 8e shows the incubation time of all four series of mold fluxes. It suggests that the incubation time was first reduced and then increased with the increase of bubbles in the mold fluxes, and the same tendency is found in the nose temperature. The heterogeneous nucleation in the slag was promoted by the bubbles, which facilitated crystallization. In addition, according to equations 1 through 7, the polymerization of silicate structures could have been broken through this reaction, leading to a fast transfer of ions. The movement of bubbles also increased the ion transfer. Inevitably, a decrease in incubation time is conducted. When the bubble content further increases (i.e., the B3 slag), the actual bubble content remaining in the molten slag reduced. Correspondingly, the incubation time prolonged.
Reference: Not shown in this demo version.

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