Characterisation and Properties of Lithium Disilicate Glass Ceramics in the SiO2-Li2O-K2O-Al2O3 System for Dental Applications. (7th August 2013)

• Record Type: Journal Article
• Authors: Monmaturapoj, Naruporn; Lawita, Pornchanok; Thepsuwan, Witoon
• Other Names: Brauer Delia Academic Editor.
• Is Part Of: Advances in materials science and engineering. Volume 2013(2013)
• Publication Date: 2013-08-07
• Subjects: Materials science -- Periodicals; Materials science; Periodicals; 620.11
• DOI: 10.1155/2013/763838
• Languages: English
• ISSNs: 1687-8434

Abstract

Abstract : This work proposes four different glass formulas derived from the SiO2 -Li2 O-K2 O-Al2 O3 system to investigate the effect of glass composition on their crystal formations and properties. Glass LD1 was SiO2 -Li2 O-K2 O-Al2 O3 system with the addition of P2 O5 and CaF2 as nucleating agents. In Glass LD2, a slight amount of MgO was mixed in order to increase the viscosity of the melting glass. Finally, the important factor of Si : Li ratio was increased in Glasses LD3 and LD4 with compositions otherwise the same as LD1 and LD2. The results found that P2 O5 and CaF2 served as a nucleating site for lithium phosphate and fluorapatite to encourage heterogenous nucleation and produce a fine-grained interlocking microstructure of lithium disilicate glass ceramics. MgO content in this system seemed to increase the viscosity of the melting glass and thermal expansion coefficient including the chemical solubility. Increasing the Si : Li ratio in glass compositions resulted in the change of the microstructure of Li2 Si2 O5 crystals.