Mould Slag with Al2O3 and CaF2

Name: Mould Slag with Al2O3 and CaF2
Diagram No.: 1125
Type of diagram: CCT
Chemical composition in weight %: See the table
Group: Slags
Note: Two slags with higher alumina (CS3_A10) and CaF2 contents (CS3_F10) have been cooled at various cooling rates between 10 K/min and 500 K/min. As a result temperature-timetransition diagrams (TTT) have been constructed which show the evolution of the crystalline fraction with time. The temperatures where 50% and 100% of crystalline fraction appeared were analyzed using image analysis. The results are shown in Figure 1 and 2. The start temperature decreases with increasing cooling rate in all cases. This is in accordance with typical nucleation and growth from an undercooled melt where each phase formation needs time for necessary diffusion of the components. The same is valid for the temperature of a certain crystallization degree. At high cooling rates (more than 100 K/min) the samples did not crystallize completely down to room temperature as the diffusion was too slow at lower temperatures (lower than 1000C).
While the slag with alumina (CS3_A10) tends to form crystals even at 500 K/min, glassy solidification takes place in slag CS3_F10 at cooling rates of more than 200 K/min. The very close composition of CS3_A10 to gehlenite might be the reason for this behaviour. Thus less diffusion transport of slag components is necessary to form gehlenite and the crystal formation takes place even at high cooling rates.
Reference: Not shown in this demo version.

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