ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 66, (2) 157 - 166 (2022)


EFFECT OF CRYSTALLISATION TEMPERATURE ON LAS TRANSPARENT GLASS-CERAMICS CONTAINING A HIGH Al₂O₃ CONTENT
 
Shi Mingjuan, He Feng, Zhou Zhiqiang, Yang Xiaorong, Xie Junlin
 
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, PR China

Keywords: Low thermal expansion coefficient, β-quartz solid solution, The content of Al₂O₃ , LAS transparent glass-ceramics
 

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 β-quartz solid solution with nano-size precipitated from the glass after the heat treatment and when the crystallisation temperature was 820 °C, the bending strength and microhardness reached 156 MPa and 1082.09 HV, respectively.


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doi: 10.13168/cs.2022.0010
 
 
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