The Effect of P_2O_5 and Heat Treatment on the Crystallization of Li_2O·2SiO_2-BaO·2SiO_2 (LS_2-BS_2) Glass

• Authors: B. Ertuğ , E. Demirkesen
• Languages of publication: EN

Abstracts

EN

In this paper, the effects of P_2O_5 and heat treatment on the crystalline phases and microstructure of lithium disilicate-barium disilicate glass were examined. A wider and broad peak in the differential thermal analysis curve indicates a presence of surface crystallization instead of volume crystallization despite the use of nucleating agent, P_2O_5. The heat treatment schedules were planned according to differential thermal analysis data. The controlled crystallization of the compositions studied was carried out using two-stage heat treatment procedure. The glass transition temperature, T_{g} of the as-cast sample were used to determine the optimum nucleation temperature. The optimum nucleation temperature was determined to be 520°C. The crystallization was carried out at 720C and 880C for 15 min. Lithium disilicate and sanbornite was the major phases and moganite or coesite were also present depending on the heat treatment duration. Due to coexistence of lithium disilicate and barium disilicate phases, the change in the melting entropy prevented the formation of spherulitic morphology and recrystallization after further heat treatments. The rise in the crystallization temperature enhanced grain coarsening and formed massive microstructures.

Keywords

EN

81.05.Kf; 81.10.Jt; 61.72.-y

Discipline

• 81.10.Jt: Growth from solid phases (including multiphase diffusion and recrystallization)
• 81.05.Kf: Glasses (including metallic glasses)
• 61.72.-y: Defects and impurities in crystals; microstructure(for radiation induced defects, see 61.80.-x; for defects in surfaces, interfaces, and thin films, see 68.35.Dv and 68.55.Ln; see also 85.40.Ry Impurity doping, diffusion, and ion implantation technology; for effects of crystal defects and doping on superconducting transition temperature, see 74.62.Dh)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2013
• Volume: 123
• Issue: 2
• Pages: 191-192

Dates

published

2013-02

Contributors

author

B. Ertuğ

• Orion Company Industry and Trade Ltd., Organized Industrial Zone, Metal İş Sanayi Sitesi 5. Blok No:2, Ikitelli, Istanbul, Turkey

author

E. Demirkesen

• Istanbul Technical University, Metallurgical and Materials Engineering, 34469 Maslak, Istanbul, Turkey

References

• [1] M. Guedes, A.C. Ferro, J.M.F. Ferreira, J. Eur. Ceram. Soc. 21, 1187 (2001)
• [2] P.F. James, Y. Iqbal, U.S. Jais, S. Jordery, W.E. Lee, J. Non-Cryst. Solids 219, 17 (1997)
• [3] S.C. von Clausbruch, M. Schweiger, W. Höland, V. Rheinberger, J. Non-Cryst. Solids 263-264, 388 (2000)
• [4] R.D. Maurer, in: J. Appl. Phys. 33, 2132 (1962)
• [5] P.W. McMillan, Glass Ceramics, 2nd ed., Academic Press, London 1979

Identifiers

DOI

10.12693/APhysPolA.123.191