Phase equilibria in the CaO center dot SiO2-Na2O center dot SiO2-Na2O center dot Al2O3 center dot 6SiO(2) system

作者：Zhang, Z.^*; Xiao, Y.; Voncken, J. H. L.; Yang, Y.; Boom, R.; Wang, N.; Zou, Z.; Li, G.

来源：Journal of the European Ceramic Society, 2014, 34(2): 533-539.

DOI：10.1016/j.jeurceramsoc.2013.07.011

• Phase relations
• Silicate
• Micro structure
• X-ray methods

Equilibrium phase relations in the system CaO center dot SiO2-Na2O center dot SiO2-Na2O center dot Al2O3 center dot 6SiO(2) at 40-80 wt% Na2O center dot Al2O3 center dot 6SiO(2) composition range have been experimentally studied at temperatures between 800 degrees C and 1200 degrees C. The liquidus temperature was determined with differential scanning calorimetry. The equilibrated samples were quenched with pressurized nitrogen, and examined with electron probe X-ray microanalysis and X-ray diffraction for identification of microstructure and phase relations. Five primary phase fields, CaO center dot SiO2, Na2O center dot SiO2, Na2O center dot 2CaO-3SiO(2), 2Na(2)O center dot CaO center dot 3SiO center dot 2 and Na2O center dot Al2O3 center dot 6SiO(2) were established. The ternary eutectic point of CaO center dot SiO2, Na2O center dot 2CaO center dot 3SiO(2) and Na2O center dot Al2O3 center dot 6SiO(2) was determined to be at 1030 degrees C with the composition of 29.0 wt% CaO center dot SiO2, 12.0 wt% Na2O center dot SiO2 and 59.0 wt% Na2O center dot Al2O3 center dot 6SO(2). Peritectic reaction of Na2O center dot 2CaO center dot 3SiO(2), 2Na(2)O center dot CaO.3SiO(2) and Na2O center dot Al2O3 center dot 6SiO(2) occurred at 930 degrees C with the composition of 13.0 wt% CaO center dot SiO2, 29.0 wt% Na2O center dot SiO2 and 58.0 wt% Na2O center dot Al2O3 center dot 6SiO(2). The liquidus surface projection of the ternary system has been constructed in the composition region important for the bottom ash application.

• 出版日期2014-2
• 单位武汉科技大学; 安徽工业大学; 东北大学