CaO x SiO2 x Al2O3 x Na2O x CaF2 Slag

Name: CaO x SiO2 x Al2O3 x Na2O x CaF2
Diagram No.: 1123
Type of diagram: CCT
Chemical composition in weight %: 39.58% CaO, 40.94% SiO2, 6.94% Al2O3, 9.57% Na2O, 1.00% CaF2
Group: Slags
Note: A number of continuous cooling experiments were performed for various cooling rates in order to obtain a CCT diagram. The time and temperature for the beginning of crystallization was determined when the first crystal could be observed and the result can be seen in figure 1.

With increasing cooling rate the time and temperature for the beginning of crystallization decreases. There is a drop of the curve between 5C/s and 8C/s. For cooling rates above 20C/s no crystallization could be detected. A comparison between the TTT curve and the CCT curve is shown in figure 2. The onset of crystallization occurs at a longer time for the continuous cooling experiments than for the isothermal experiments. When the cooling curve reaches the TTT curve for beginning of crystallization the nucleation is low and further time (and therefore cooling) will be necessary before the first crystal can be observed. The morphology of the precipitated crystals follows the pattern developed from isothermal experiments. However as the temperature is transient, the predominant morphology is strongly dependent on the cooling rate. The first crystals to be observed for the 20C/s experiment are columnar as predicted by the isothermal experiment but as the temperature decreases the predominate structure is of the cloud like type. It is obvious that the temperature dependency of the precipitated morphology follows a certain pattern. If the crystal morphology of solid slag samples can be determined, it is therefore possible to predict the prevailing thermal field in the liquid slag during the crystallization.

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