CSAM (CaO, SiO2, Al2O3, MgO) Slags

Name: CSAM (CaO, SiO2, Al2O3, MgO)
Diagram No.: 1162
Type of diagram: TTT
Chemical composition in weight %: See the table
Group: Slags
Note: TTT Diagram for samples with (a) NBO/T= 1.18 (b) NBO/T = 1.44 (c) NBO/T =1.56 (d) NBO/T=1.71(e) NBO/T = 1.78 (f) NBO/T =1.94.
The TTT diagrams of different slag compositions are shown in Figure 1. The sample with a NBO/T=0.77 did not crystallize at any temperature. Also, the sample with NBO/T=1.18 only crystallized at a single temperature (shown as a point in Figure 1 - a). The start curve of TTT diagrams of six slag samples are shown in Figure 2. As evident from Figure 2, with increasing basicity expressed as NBO/T, the TTT curves of glassy to crystalline transformation shift to the left indicating higher tendency for crystallization. This agrees with the fact that with the increase of basicity, a greater number of Si-O bonds are broken, which in turn facilitates the re-ordering of the silicate structure, i.e. faster crystallization. Higher basicity also shifts the TTT diagrams to higher temperatures since the liquidus temperatures increase with an increase in the basicity.
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