EFFECT OF CRYSTALLISATION TEMPERATURE ON LAS TRANSPARENT GLASS-CERAMICS CONTAINING A HIGH Al2O3 CONTENT

The influence of the crystallisation temperature on the structure and properties of Li2O-Al2O3-SiO2 (LAS) glass-ceramics with a high aluminium content was investigated. Glass-ceramics with ultra-low CTE and high transmittance were successfully prepared by the melt-quenching method and a two-step heat treatment. The crystallisation behaviour of the glass was studied via DSC and XRD. Besides, FTIR, Raman and FE-SEM were used to explore the structure of the samples under different crystallisation temperatures. The results showed that a beta-quartz solid solution with nano-size precipitated from the glass after the heat treatment and when the crystallisation temperature was 820 degrees C, the bending strength and microhardness reached 156 MPa and 1082.09 HV, respectively.

Automated summary

Influence of the crystallisation temperature on the structure and properties of Li2O-Al2O3-SiO2 (LAS) glass-ceramics with high aluminium content was investigated. Glass-ceramics with ultra-low CTE and high transmittance were successfully prepared by the melt-quenching method and a two-step heat treatment. The crystallisation behaviour of the glass was studied via DSC and XRD. Besides, FTIR, Raman and FE-SEM were used to explore the structure of the samples under different crystallisation temperatures. A beta-quartz solid solution with nano-size precipitated from the glass after the heat treatment and when the crystallisation temperature was 820 degrees C, the bending strength and microhardness reached 156 MPa and 1082.09 HV, respectively.