CaO–Al2O3 Eutectic Slag

Name: CaO–Al2O3 Eutectic Slag
Diagram No.: 976
Type of diagram: TTT
Chemical composition in weight %: See the table
Group: Slags
Note: Figure 14 shows the TTT diagram of CAEU under Ar atmosphere. The solid circles and line means the start of the crystallization, and the solid triangles and line means the end of crystallization. The nose position located at 7 s and 1100°C. In the high temperature region from the nose position, the time between the start and the end was very short, which meant the growth rate of crystals was high, while in the lower temperature region below the nose position, the growth rate was low.

Figure 15 shows the TTT diagram under Ar–Ti atmosphere. In the case of lower partial pressure of oxygen, the nose position was moved to the high temperature region (1150°C), but the start time was almost the same (7 s). The line of starting crystallization also moved toward the high temperature region which meant the lower growth rate of crystal in comparison with Ar atmosphere. Figure 16 shows the TTT diagram under Ar–Ti–CaS atmosphere, which is resemble to the TTT under Ar–Ti atmosphere. This sample was not added the sulfur (CaS) directly, however, a small quantity of sulfur was originated from the gas phase as mentioned above. Since the small content of sulfur existed in the slag, a significant change of TTT diagram was not found. In the another paper) the CaS up to 10 mass% was added directly to the CAEU slag, and the changes of TTT diagrams were discussed.

Figure 17 shows the comparison of the TTT diagram (start of crystallization) among three different atmospheres (Ar, Ar–Ti and Ar–Ti–CaS). The start of crystallization in the lower temperature region below the nose position was almost the same among three conditions, while in the high temperature region, the crystallization in the Ar+Ti and Ar+Ti+CaS atmospheres started earlier than that of Ar atmosphere, for example, about 80 s to 20 s at 1250°C and about 2 000 s to 200 s at 1300°C. From the results of SEM observation, the formation of primary crystal of CA might related to this phenomenon caused by the lower oxygen partial pressure and the existence of sulfur.

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