Influence of heat treatment temperature on the properties of the lithium disilicate‐fluorcanasite glass‐ceramics

Abstract

This study aims to investigate the influence of heat treatment temperatures on the mechanical properties and chemical solubility (CS) of lithium disilicate‐fluorcanasite glass‐ceramics and to develop new dental materials. The glasses and glass‐ceramics were prepared using CaF2‐SiO2‐CaO‐K2O‐Na2O‐Li2O‐Al2O3‐P2O5‐based glass system using a conventional melt quenching method followed by a two‐stage crystallization process. This two‐stage method involves two heating temperature steps: first at a constant temperature (TS1) of 600°C and second step at varying temperatures (TS2) of 650, 700, 750, and 800°C. The crystallization behavior, phase formation, microstructure, translucency characteristic, density, hardness, fracture strength, and CS were investigated. It was found that the lithium disilicate crystal acted as the main crystalline phase, and the crystalline phase of fluorcanasite occurred at the heat treatment temperatures of 750 and 800°C. In addition, it was found that density, hardness, fracture strength, and CS increased while the translucency values decreased with increasing heat treatment temperatures. Furthermore, the CS increased dramatically when the fluorcanasite phases occurred in the glass‐ceramic samples. The maximum density values, Vickers hardness, fracture toughness, and flexural strength are 2.56 g/cm3, 6.73 GPa, 3.38 MPa.m1/2, and 259 MPa, respectively. These results may offer a possibility to design a new material for dental applications based on lithium disilicate‐fluorcanasite glass‐ceramics.

Optimization of heat treatment program and effect of heat treatment on microstructure and flexural strength of micro-nano-Li2Si2O5 whisker-reinforced glass-ceramics

“…At the temperature within the first exothermic peak of DTA (~700 °C), LD was detected in addition to LM formation as main phase. The result was different from previous studies (Soares et al, 2015;Zhang et al, 2015;Kraipok et al, 2022), which LD could only be transformed from LM at higher temperature. Additionally, Li 3 PO 4 was not detected because the amorphous form existed at low temperature, with less size and content (Höland et al, 2006;Sun et al, 2021).…”

Frankamenite: Relationship between the Crystal–Chemical and Vibrational Properties

“…By modifying the compositions, the biological activity of the modified glass-ceramics can be significantly increased [23,24]. The addition of lithium disilicate increases the chemical resistance of fluorcanasite-based glass-ceramics [25,26]. Vyas et al (2022) [27] found out that with increased fluorcanasite content in the composition, hydrophilicity also increases over the entire surface of the sample, and, subsequently, cell adhesion and proliferation is raised.…”

Preparation and properties of the glass‐ceramics from low Ti‐bearing blast furnace slag and waste glass

“…The main influencing factors affecting this process include chemical composition and heat treatment. [16][17][18][19] Previous studies claimed that SiO 2 is the primary oxide in silicate glass, and the glass structure featured a significant impact on the material properties. 20,21 CaO act as a network modifier in the silicate network, which can destroy the bridge oxygen bond of Si-O-Si units.…”

“…The crystallization behavior of the basic glass is mainly affected by nucleation and crystal growth. The main influencing factors affecting this process include chemical composition and heat treatment 16–19 . Previous studies claimed that SiO 2 is the primary oxide in silicate glass, and the glass structure featured a significant impact on the material properties 20,21 .…”