In this study the use of hydratable alumina binder (Alcoa) instead of Calcium Aluminate (CA) cement as binder in the production of SiC-, High Alumina- and MgO-based self-flowing castable has been investigated. Tabular alumina, calcined monodipersed alumina, and hydratable alumina/CA cement were used as binder matrix. Anorthite (CaO.Al_2O_3.2SiO_2) and gehlenithe (2CaO.Al_2O_3.2SiO_2) phases were formed according to the CaO-Al_2O_3-SiO_2 three phase diagram. Molten phase negatively affects refractoriness of the materials. For that reason, by using hydratable alumina instead of CA cement mullite binder was created. Mullite was studied by SEM. In addition to CA cement supplementary samples, molten phase produced with CaO lessened the value of the hot modulus of rupture (HMOR). Hydratable alumina binder added samples at 1450 °C, however amplified the values of HMOR. In this study, enhance of thermomechanical features is aimed by using hydratable alumina instead of CA cement, which is one of the components of binder matrix. CCS and CMOR values have improved by increasing of CaO amount, yet HMOR values diminished. Amount of glassy phase and thermomechanical properties of the material has enhanced by using hydratable alumina.
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