Fluorine-free Mould Fluxes

Name: Fluorine-free Mould Fluxes
Diagram No.: 987
Type of diagram: CCT
Chemical composition in weight %: See the table
Group: Slags
Note: CCT diagrams of mould fluxes: (a) Sample 1: CaO/SiO2= 0.9; (b) Sample 2: CaO/SiO2=1.0; (c) Sample 3: CaO/SiO2=1.1; (d) Sample 4: CaO/SiO2=1.2; and (e) onset of crystallisation at different CaO/SiO2.
Figures (a) to (d) show the CCT diagrams of mould fluxes with CaO/SiO2 ratios from 0.9 to 1.2. The crystallisation temperature of the mould fluxes with a certain cooling rate increased with the increase of CaO/SiO2 ratio. For example, the crystallisation temperature of the mould fluxes was 964C, averaged out from three individual measurements, when CaO/SiO2 = 0.9 and the cooling rate was 1C/s; it increased to 1276C when CaO/SiO2 = 1.2 in cooling with the same rate. A comparison between the CCT diagrams for fluxes with different CaO/SiO2 ratios is illustrated in Fig. (e). The crystallisation temperature decreased with increasing cooling rate. For example, the crystallisation temperature of Sample 2 (CaO/SiO2 = 1.0) decreased from 1095C when the cooling rate was 0.1C/s to 932C when the cooling rate raised to 2C/s (Fig. (b)). As the CaO/SiO2 ratio increased, the critical cooling rate, above which liquid phase is completely transformed to glass, raised from 1C/s for CaO/SiO2 = 0.9, 2C/s for CaO/SiO2 = 1.0, 20C/s for CaO/SiO2 = 1.1, and further to over 30C/s for CaO/SiO2 = 1.2. The cooling rate for quenching of Sample 4 into glass was approximately 150C/s.
Reference: Not shown in this demo version.

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