CaO x SiO2 x Al2O3 x Na2O x CaF2 Slag

Name: CaO x SiO2 x Al2O3 x Na2O x CaF2
Diagram No.: 1122
Type of diagram: TTT
Chemical composition in weight %: 39.58% CaO, 40.94% SiO2, 6.94% Al2O3, 9.57% Na2O, 1.00% CaF2
Group: Slags
Note: The isothermal experiments were carried out in a temperature range of 1260C and 800C. The time for the beginning of crystallization is defined as the time when the first crystal can be observed in the sample. The resolution of camera lens system allows observation down to approximately 0.5% crystalline fraction in the sample. Melting experiments were performed with a low heating rate to determine the solid and liquid temperature. It was found that the sample started to melt at 1160C and became completely liquid at 1260C. From this result it was concluded that a two-phase region exists between 1260-1160C. Figure 1 shows the TTT-diagram for the onset of crystallization for the studied slag sample.

The beginning of crystallization at different temperatures forms a classic single C-shaped curve as predicted by classical nucleation theory with a nose position at 1000C. The time for the beginning of crystallization is generally short (4-7 s) between 1180-940C. The obtained TTT diagram was compared with a TTT diagrams for a lower content of Na2O and no CaF2 obtained by Kashiwaya et al5 and the comparison can be seen in figure 2. Increasing the content of Na2O and adding CaF2 increases the crystallization. The quantified comparison of TTT curves for different slag composition is a useful tool for design of mold slags with a predictable crystallization behavior.

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