Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 5, Pages 6773-6778Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.11.020
Keywords
Lime fluorosilicate glass; Melt crystallization; Cuspidine; Nucleation
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Funding
- POSCO Research Laboratory, Pohang, Korea
- Industrial Strategic Technology Development Program [10063056]
- Ministry of Trade, Industry & Energy (MOTIE), Korea
- Korea Evaluation Institute of Industrial Technology (KEIT) [10063056] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The effects of Li2O on the crystallization behavior of Cuspidine in CaO-SiO2-CaF2 glass were studied, revealing that Li2O could affect the crystallization rate and nucleation was identified as the limiting step of the crystallization process.
This paper presents the effects of Li2O on the kinetics and structural aspects of the Cuspidine (Ca4Si2F2O7) crystallization behavior of CaO-SiO2-CaF2 glass (basicity 1.7). In order to elucidate the crystallization characteristics during differential scanning calorimetry (DSC) measurements, the kinetic parameters have been determined using the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation. The crystallization rate constant and negative activation energy thus calculated indicated that the limiting step of crystallization was nucleation. Also, Raman spectroscopy and Solid-state MAS NMR spectroscopy analyses indicated that lithium could interact with fluorine, thereby disturbing the interaction between calcium and fluorine. This retards Cuspidine nucleation at the initial stage of melt crystallization. These findings on CaO-SiO2-CaF2-based glass lubricants can be used to optimize essential properties such as viscosity and crystallization temperature during continuous casting of steels.
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