Crytallization and Properties of SiO2-Al2O3-K2O-ZrO2 Glass-Ceramics for Dental Applications

Siti Mazatul Azwa Saiyed Mohd Nurddin; Malek Selamat

doi:10.4028/www.scientific.net/AMR.1024.281

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1024Crytallization and Properties of...

Crytallization and Properties of SiO₂-Al₂O₃-K₂O-ZrO₂ Glass-Ceramics for Dental Applications

Abstract:

The aim of the study was to investigate the influence of ZrO₂ on the crystallization and properties of leucite phase from K₂O -Al₂O₃- SiO₂glass-forming melts. A starting glass composition of weight %; 60.7-63.2% SiO₂, 16.6% Al₂O₃, 11.6% K₂O, 5.10% Na₂O, 2.5-5.0% ZrO₂, 0.5% TiO₂ and 0.5% LiO₂ was melted in an electric furnace, followed by quenched in cool water to produce glass frit. Malaysian silica sand from Terengganu was used as the SiO₂source. The glass powders were ball milled and compressed to form 13mm diameter discs using cool isostatic pressing. The discs were sintered at 650°C, 700°C, 750^°C, 800^°C and 850^°C for 1 hour and characterised using X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). The results indicate that the amount of ZrO₂ additive is one of the key factors controlling of leucite crystallization. The properties of sintered disc specimens were studied using three point bending, diametral and Vickers microhardness test. The results showed that the mechanical properties of leucite glass-ceramics increased as the amount of ZrO₂ was increased.

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Periodical:

Advanced Materials Research (Volume 1024)

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281-286

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1024.281

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Online since:

August 2014

Authors:

Siti Mazatul Azwa Saiyed Mohd Nurddin*, Malek Selamat

Keywords:

Crystallization, Glass-Ceramics, Leucite

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