CaO-SiO2-Al2O3-Na2O-CaF2 Slag

Name: CaO-SiO2-Al2O3-Na2O-CaF2
Diagram No.: 1155
Type of diagram: TTT
Chemical composition in weight %: See the tables
Group: Slags
Note: Figures 46, 47, and 48 show the TTT diagrams for Samples E1, E2 and E3, respectively. The time for the beginning of crystallization (t0.005) was defined as 0.5% crystalline fraction, considering the resolution of the observation system. The time for the end of crystallization (t0.95) was defined as 95% crystalline fraction.

During the melting experiments, it was found that Sample E1 became completely transparent at around 1330C. Isothermal experiments near 1330C showed that the beginning of crystallization took place after a relatively long time (~45 min.), and was never completed through the whole sample. The crystalline fraction remained in equilibrium with the liquid phase, crystals formed and dissolved simultaneously. 100% crystalline fraction could be observed at around 1240C. This observation suggests that a two-phase region exists between approximately 1330-1240C. This TTT curve has an upper (1330-1010C) and lower nose (1010-885C). The nose positions occur at 1100C and 930C, respectively. The presence of this double nose was first questioned, as there is no change in the crystal phase along this curve. However, there is a change in crystal morphology at 1000C that would explain the double nose due to a new nucleation mechanism.

For Sample E2, only one nose was observed at 1020C and 15s. A two-phase region appeared between 1320C and 1280C. 100% crystalline phase was observed at lower temperatures.

For Sample E3, melting experiments were performed with a low heating rate to determine the solidus and liquidus temperatures. It was found that the sample started to melt at 1160C, and became completely liquid at 1260C. No crystallization was observed above 1260C. From this result, it was concluded that a two-phase region exists between 1260C and 1160C. For Sample E3, the time for the beginning of crystallization is generally short (4-7s) between 1180-940C. The nose position is at 1000C and 4s.

Reference: Not shown in this demo version.

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