CaO–Al2O3–MgO Slag

Alloy name: CaO–Al2O3–MgO Slag
Diagram No.: 977
Type of diagram: TTT
Chemical composition in weight %: 30(33)% CaO, 57(62)% Al2O3, 5% MgO, 0(8)% Li2O
Group: Slag
Note: Figure 5 shows the TTT diagram of the CAM glass. The solid curves in Fig. 5 indicate the crystallinity which was determined by the XRD internal standard method. As can be seen in Fig. 5, with the heat-treatments at temperatures above 1273 K, the crystallization started after a very short holding time of less than 100 s. Moreover, the crystallinity increased with the holding time, and the rate of crystallization increased with the holding temperature.
It is well known that, in silicate systems, glassy phases are easily obtained. In other words, crystallization does not occur easily, which is attributed to the low diffusivity due to the rigidly bonded silicate networks (SiO44–)n. The crystallization rate of the aluminate based inclusions in the present study was significantly higher than that of silicate based inclusions in the previous investigation) which is responsible for the structure of aluminate melts without rigid networks as silicate melts.
The TTT diagram of the CAML glass is shown in Fig. 6. As shown in Fig. 6, the crystallinity curves of the CAML glass were placed in a shorter holding time region than that of the CAM glass. These results indicate that the addition of Li2O will accelerate the crystallization of CaO–Al2O3– MgO system, which might be attributed to the fact that Li2O would lower the viscosity of aluminate melts.
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