Impact of recently discovered sodium calcium silicate solutions on the phase diagrams of relevance for glass-ceramics in the Na2O-CaO-SiO2 system

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-05
Major/Subject
Mcode
Degree programme
Language
en
Pages
15
2449-2463
Series
Journal of the European Ceramic Society, Volume 42, issue 5
Abstract
Although phase relations in the Na2O-CaO-SiO2 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 Na2CaSiO4 and Na2Ca2Si2O7 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 SiO2, Na2Ca3Si6O16, combeite, Na4CaSi3O9ss, CaSiO3, Na2CaSiO4ss, Na2Ca2Si2O7ss, Na2Ca6Si4O15, Ca3Si2O7 and Ca2SiO4. 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 Na2O-CaO-SiO2 system. The present study also discusses the findings and their impact on melting and annealing processes during the manufacture of glass and glass-ceramics.
Description
Funding Information: The study was financially supported by the FLASH project (Predicting the flow behavior of ash mixtures for production of transport biofuels in the circular economy, grant number 280892) within the EnergiX program by the Norwegian Research Council, Norway and also by the Symbiosis of metals production and nature (SYMMET) project of Business Finland. Academy of Finland's RawMatTERS Finland Infrastructure (RAMI) based at Aalto University, VTT Technical Research Centre and Geological Survey of Finland, were applied in this research. Funding Information: The study was financially supported by the FLASH project (Predicting the flow behavior of ash mixtures for production of transport biofuels in the circular economy, grant number 280892 ) within the EnergiX program by the Norwegian Research Council, Norway and also by the Symbiosis of metals production and nature (SYMMET) project of Business Finland. Academy of Finland’s RawMatTERS Finland Infrastructure (RAMI) based at Aalto University, VTT Technical Research Centre and Geological Survey of Finland, were applied in this research. Publisher Copyright: © 2022 The Authors
Keywords
Ceramics, Glass, Phase diagram, Slags, Thermodynamics
Citation
Santoso , I , Riihimäki , M , Sibarani , D , Taskinen , P , Hupa , L , Paek , M K & Lindberg , D 2022 , ' Impact of recently discovered sodium calcium silicate solutions on the phase diagrams of relevance for glass-ceramics in the Na 2 O-CaO-SiO 2 system ' , Journal of the European Ceramic Society , vol. 42 , no. 5 , pp. 2449-2463 . https://doi.org/10.1016/j.jeurceramsoc.2022.01.010