The Effect of Lithium on Crystallization and Microstructure of Glass-Ceramics in Soda-Lime Silicate System

Abstract:

This study investigated the crystallization of soda-lime silicate (NCS) system by re-melting soda-lime silicate glass cullet with Al₂O₃ CaCO₃ and Li₂O. The Li₂O was added as a nucleating agent. The effect of the nucleating agent on crystallization was investigated in order to study the possibility for use as a parent glass for glass-ceramics. Soda-lime silicate cullet was the main raw material and its chemical composition by weight was 68% SiO2 2% Al2O3 9% Na₂O 9% K₂O 3.5% CaO 2.5% MgO 1.2% TiO₂ 3% SrO and 2% ZnO. Glass batches with composition (%wt) of (65-x) Cullet:13Al₂O₃:22CaCO₃:x(Li₂O) (x = 0, 1, 2, 4, 6 and 8) were melted at 1500°C for 3 hours and annealed at 600°C. All glasses added with Li₂O were clear except x = 8. The crystallization was investigated by Differential Scanning Colorimetry technique (DSC). The results exhibited the exothermic peak of crystallization (T_p^I and T_p^II). The glasses with added Li₂O exhibited decreasing crystallization temperature with increasing Li content. The glasses were heated at temperatures around the crystallization temperature (700, 750 and 800°C). After heat treatment, the crystalline phase in the glasses was determined by X-ray diffraction technique (XRD). The microstructure was investigated by optical microscope and Scanning Electron Microscope (SEM). The phases of Nepheline (Na,K)AlSiO₄ and Wollastonite (CaSiO₃) were found. The crystallization depended on the heat treatment temperature. The thermal expansion of the glasses was determined by the dilatometric method to indicate the characteristics of the glass-ceramics. In conclusion, Li₂O had a strong effect on the crystallization in soda-lime silicate system. The result could be applied for the production of glass-ceramics from soda-lime cullet.

• Periodical: Solid State Phenomena (Volume 283)
• Pages: 160-166
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.283.160
• Online since: September 2018
• Authors: Ekarat Meechoowas*, Benjamon Petchareanmongkol, Usanee Pantulap, Kanit Tapasa
• Keywords: Crystallization, Glass-Ceramics, Lithium, Microstructure

References

[1] C. Madivate, F. Müller and W. Wilsmann, Thermochemistry of the glass melting process energy requirement in melting soda-lime-silica glasses from cullet-containing batches.Glastech. Ber. 69, 167-178 (1996).

[2] J. E. Shelby, Introduction to glass science and technology 2nd, The royal society of chemistry. Cambridge, (2005).

[3] E. D. Zanotto, Surface crystallization kinetics in soda-lime-silica glasses, J. Non-Cryst. Solids., 129, 183-190 (1991).

DOI: 10.1016/0022-3093(91)90094-m

[4] W. D. Kingery,‎ H. K. Bowen and D. R. Uhlmann, Introduction to ceramics 2nd, A Wiley Interscience Publication, New York, (1976).

[5] E. D. Zanotto, A bright future for glass-ceramics, Am. Ceram. Soc. Bull., 89,19-27 (2010).

[6] A. A. Francis, R. D. Rawling and A. R. Boccaccini, Glass-ceramics from mixtures of coal and soda-lime glass by petrurgic method., "J. Mater. Sci. Lett., 21, 975-980 (2002).

DOI: 10.1016/s0140-6701(03)81931-8

[7] A. A. Francis, R. D. Rawling, R. Sweeney and A. R. Boccaccini, Crystallization kinetic of glass particles prepared from a mixture of coal and soda-lime cullet glass., J. Non-Cryst. Solids., 333,187-193 (2004).

DOI: 10.1016/j.jnoncrysol.2003.09.048

[8] M. Reben, J. Wasylak and M. Kosmal, Glass-ceramics from kinescope glass cullet, Processing, Properties, and Applications of Glass and Optical Materials: Ceram. Trans., 231, 151-159 (2012).

DOI: 10.1002/9781118472590.ch17

[9] T. K. Aboud, L. Stoch and M. Sroda, Quattz crystallization in soda-lime-silica glass, Opt. Appl., 35, 829-836, (2005).

[10] N. Koga, J. Seatak and Z. Strnad, Kinetics of crystallization in soda-lime-silica system. Part 1. Na2O.CaO.2SiO2 and Na2O.CaO.3SiO2 by DTA, Thermochim. Acta., 203, 361-372, (1992).

DOI: 10.1016/0040-6031(92)85210-m

[11] Y. B. Son, C. H. Kim, S. D. Jang, J. Liu, M. Sarikaya and A. Aksay, Crystallization behaviour of cordierite-base glass with excess SiO2 and Al2O3 at initial stage, Jpn. J. Appl. Phys., 33, 1101-1108, (1994).

DOI: 10.1143/jjap.33.1101

[12] Y. Demirci and E. Gunay, Crystallization behaviour and properties of cordierite glass-ceramics with added boron oxide, J. Ceram. Process. Res., 12, 352-356, (2011).

[13] E. Meechoowas, U. Pantulapa, K. Tapasa and T. Jitwatcharakomal, The effect of modified soda-lime cullet composition on crystallization of glass-ceramics, 1st Joint meeting DGG-Acers GOMD, Aachen, Germany (2014).

[14] E. Meechoowas, S. Suriyoporn, U. Pantulapa and K. Tapasa The effect of zirconium oxide on properties and crystallization of soda-lime silicate glass, Key. Eng. Mater., 751, 374-378, (2017).

DOI: 10.4028/www.scientific.net/kem.751.374