Crystallization Behavior and Kinetics of Lithium Aluminosilicate Glasses with Various Li2O Contents

The crystallization behavior of Li 2 O-Al 2 O 3 -SiO 2 glasses with various concentration of Li 2 O were investigated by DSC, XRD, and FE-SEM. The h/l-quartz s.s. is the main crystalline phase for all of the glass with the heat treatment of 720 °C/3 h+800°C/1.5 h while the crystallinity and crystal...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2021-04, Vol.36 (2), p.243-247
Main Authors: Han, Jianjun, Hong, Wei, Jiang, Hong, He, Jianxiong, Wang, Qianchen, Wang, Jing, Gao, Wenkai
Format: Article
Language:English
Subjects:
Advanced Materials
Aluminosilicates
Aluminum oxide
Aluminum silicates
Chemistry and Materials Science
Crystal structure
Crystallinity
Crystallization
Glass ceramics
Heat treating
Heat treatment
Lithium aluminosilicate
Lithium oxides
Materials Science
Quartz
Silicon dioxide
Thermal expansion
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Summary:The crystallization behavior of Li 2 O-Al 2 O 3 -SiO 2 glasses with various concentration of Li 2 O were investigated by DSC, XRD, and FE-SEM. The h/l-quartz s.s. is the main crystalline phase for all of the glass with the heat treatment of 720 °C/3 h+800°C/1.5 h while the crystallinity and crystal size increase with the increase of Li 2 O contents. Due to the negative thermal expansion coefficient of h/l-quartz s.s., the thermal expansion coefficient of glass-ceramics decreases with the increasing of Li 2 O contents. When the Li 2 O content is 9mol%, the near-zero CTE 20–700 °C = −0.09 × 10 −6 °C −1 is obtained upon the heat treatment of 720 °C/3 h+800 °C/1.5 h. The crystallization activation energy of the glass with 9mol% Li 2 O is about 351 kJ/mol, and the crystallization mechanism is volume crystallization.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-020-2401-2