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Crystallization of leucite in potassium-alumino-silicate glasses

S. YILMAZ1,* , S. AGATHOPOULOS2, F. N. OKTAR3,4,*

Affiliation

  1. Metallurgical and Materials Engineering Department, Faculty of Engineering, Istanbul University, Istanbul, Turkey
  2. Materials Science and Engineering Department, Ioannina University, Greece
  3. Department of Bioengineering, Faculty of Engineering, Marmara University, Istanbul, Turkey
  4. Nanotechnology Biomaterials Application & Research Centre, Marmara University, Istanbul, Turkey

Abstract

Leucite crystals were successfully precipitated in a glass matrix which had the precise stoichiometric composition of leucite (KAlSi2O6). Potassium silicate compound was first produced. Then, alumina was added to obtain the potassium alumino-silicate glass. Crystallization took place at 1550°C for 24 h in air with a heating rate of 3°C/min. The resultant material comprised a glass matrix where dense round polycrystalline clusters (200-300μm) of leucite were homogenously dispersed, seemingly acting as crack arresters. The leucite crystals (~2-4μm thick and ~10μm long) were well-interlocked one to the other. The produced glass-ceramics exhibited good aesthetics with regards to their potential in dental applications..

Keywords

Dental Porcelains, Glass Ceramics, Leucite, Crystallization, Fracture Toughness, Characterization.

Submitted at: Aug. 27, 2013
Accepted at: May 7, 2015

Citation

S. YILMAZ, S. AGATHOPOULOS, F. N. OKTAR, Crystallization of leucite in potassium-alumino-silicate glasses, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 5-6, pp. 681-685 (2015)