Synergistic Effect of K₂O and Al₂O₃ on the Crystallization and Structure of Na₂O-CaO-SiO₂-MgO-Al₂O₃-ZnO of Glass-Ceramics

Abstract:

The Na₂O-CaO-SiO₂-MgO-Al₂O₃-ZnO glass-ceramics was prepared from the phosphorus slag as main primary raw materials by melt quenching technique. The effects of K₂O and Al₂O₃ on crystallization behavior and structure of glass-ceramics were investigated by DSC, XRD and SEM. It is shown that the main crystalline phase is combeite (Na₄Ca₄(Si₆O₁₈)) in glass-ceramics. K₂O and Al₂O₃ do not change the main crystalline phase of glass-ceramics, but K₂O increases the crystallization temperature, Al₂O₃ increases the crystallization temperature, obviously decreases the grain size. The K₂O isometric replaces Na₂O at the same time the Al₂O₃ isometric to replace SiO₂, reduced the grain size.

• Periodical: Key Engineering Materials (Volume 655)
• Pages: 234-239
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.655.234
• Online since: July 2015
• Authors: Jian Wei Cao, Zhi Wang*
• Keywords: Aluminum Oxide, Crystallization, Phosphorus Slag, Potassium Oxide

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