CaO-Al2O3-Based Slag

Name: CaO-Al2O3-Based Slag
Diagram No.: 1172
Type of diagram: TTT
Chemical composition in weight %: See the table
Group: Slags
Note: Isothermal TTT diagram for the calcium-aluminate-based slags containing 2.5, 5 and 7.5 wt pct MgO at a CaO/Al2O3 ratio of 1.0.
The isothermal cooling TTT diagrams for the CaOAl2O3- based slag containing different amount of MgO and a constant CaO/Al2O3 ratio of 1 are shown in Figure 6. Whereas the 7.5 wt pct MgO-containing CaOAl2O3- based slag showed a typical C-shaped TTT curve, the 2.5 and 5 wt pct MgO-containing CaO-Al2O3-based slag showed a half-C-shaped TTT curve. The nose, or the critical minimum time required to form a given degree of crystallization, is often analyzed to qualitatively compare the tendency for crystallization and the effects of various chemical compositions of slag systems. In the CaO-Al2O3-7.5 wt pct MgO slag, the TTT diagram was C shaped, and the apparent nose of the TTT could be considered to fall approximately at 1563 K(1290 C) and 91 seconds. As the MgO content increased from 5 to 7.5 wt pct, the nose temperature and the critical time for nucleation increased. Furthermore, the minimum undercooling needed for crystallization during isothermal cooling was found to be 85 K, 57 K, and 175 K for the 2.5, 5 and 7.5 wt pct MgO-containing slags, respectively.
Reference: Not shown in this demo version.

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