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In this study, the mullitization temperature was drastically reduced to 900 °C through adding boehmite sol to the kaolin/α-Al2O3 reaction couple. The low mullitization temperature was probably ascribed to: (1) high solubility of γ-Al2O3 in the SiO2-rich liquid during sintering, (2) adhesive effect of boehmite sol and (3) high reactivity of calcined kaolin. Also, starch particles and polystyrene (PS)...
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