TY - JOUR
T1 - Impact of recently discovered sodium calcium silicate solutions on the phase diagrams of relevance for glass-ceramics in the Na2O-CaO-SiO2 system
AU - Santoso, Imam
AU - Riihimäki, Markus
AU - Sibarani, David
AU - Taskinen, Pekka
AU - Hupa, Leena
AU - Paek, Min-Kyu
AU - Lindberg, Daniel
PY - 2022/5
Y1 - 2022/5
N2 - Although phase relations in the Na
2O-CaO-SiO
2 system are vital to melting and thermal treatments in glass and glass-ceramics industries, the available data for thermodynamic modeling are mostly based on reports published in 1920s and 1950s. The present investigation verifies the formation of solid solutions of Na
2CaSiO
4 and Na
2Ca
2Si
2O
7 which have previously assumed to be stoichiometric compounds. The impact of these solid solutions on the features of the phase diagram were investigated using the equilibration-quenching-EDS/EPMA technique. The data were reported as liquidus projections and in isothermal sections within the temperature range of 1000 and 1400 °C. Ten primary phase fields were identified, namely SiO
2, Na
2Ca
3Si
6O
16, combeite, Na
4CaSi
3O
9ss, CaSiO
3, Na
2CaSiO
4ss, Na
2Ca
2Si
2O
7ss, Na
2Ca
6Si
4O
15, Ca
3Si
2O
7 and Ca
2SiO
4. In addition, some novel liquidus data and invariants points were examined in more detail. The fundamental data obtained can be employed for the thermodynamic reassessment of the Na
2O-CaO-SiO
2 system. The present study also discusses the findings and their impact on melting and annealing processes during the manufacture of glass and glass-ceramics.
AB - Although phase relations in the Na
2O-CaO-SiO
2 system are vital to melting and thermal treatments in glass and glass-ceramics industries, the available data for thermodynamic modeling are mostly based on reports published in 1920s and 1950s. The present investigation verifies the formation of solid solutions of Na
2CaSiO
4 and Na
2Ca
2Si
2O
7 which have previously assumed to be stoichiometric compounds. The impact of these solid solutions on the features of the phase diagram were investigated using the equilibration-quenching-EDS/EPMA technique. The data were reported as liquidus projections and in isothermal sections within the temperature range of 1000 and 1400 °C. Ten primary phase fields were identified, namely SiO
2, Na
2Ca
3Si
6O
16, combeite, Na
4CaSi
3O
9ss, CaSiO
3, Na
2CaSiO
4ss, Na
2Ca
2Si
2O
7ss, Na
2Ca
6Si
4O
15, Ca
3Si
2O
7 and Ca
2SiO
4. In addition, some novel liquidus data and invariants points were examined in more detail. The fundamental data obtained can be employed for the thermodynamic reassessment of the Na
2O-CaO-SiO
2 system. The present study also discusses the findings and their impact on melting and annealing processes during the manufacture of glass and glass-ceramics.
U2 - 10.1016/j.jeurceramsoc.2022.01.010
DO - 10.1016/j.jeurceramsoc.2022.01.010
M3 - Article
SN - 0955-2219
VL - 42
SP - 2449
EP - 2463
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 5
ER -