Industrial Mold Slag

Name: Industrial Mold Slag
Diagram No.: 1178
Type of diagram: TTT
Chemical composition in weight %: 7.6% Na2O, 6.5% Al2O3
Group: Slags
Note: The precipitation of multiple phases is also observed in the solidification of mold slags. For example, from the first ever example of a TTT of a mold slag by Kashiwaya et al. two different crystal chemistries were determined by X-ray diffraction. The presence of a defined crystal chemistry was determined solely by the temperature of the isothermal hold during construction of a TTT curve (Fig.) where dicalcium silicate (Ca2SiO4) was found at temperatures above 1040 C and cuspidine (Ca4Si2O7F2) at temperatures below 1040 C. In this situation dicalcium silicate will transform to cuspidine, if held at temperatures below 1040 C and diffusion rates are reasonable. The mold slag measured in this study contained 7.6% Na2O and 6.5% Al2O3. As both elements do not appear in the crystal that is precipitated then significant segregation occurs during solidification of the mold slag.
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