Effect of Al2O3/SiO2 on Crystallization Behaviour and Mechanical Properties of Li2O-Al2O3-SiO2-MgO Glass-Ceramics

doi:10.16552/j.cnki.issn1001-1625.2025.1134

Abstract

Abstract:

Li₂O-Al₂O₃-SiO₂-MgO glass-ceramics has attracted much attention due to its excellent thermal and mechanical properties， and its glass network structure， crystal phase composition and final mechanical properties are significantly affected by Al₂O₃/SiO₂ molar ratio. In this study， a series of glass samples with different Al₂O₃/SiO₂ mole ratios compositions were prepared by high-temperature melting method， and a series of glass-ceramics with Li _x Al _x Si_1-_x O₂ as the main crystalline phase was successfully obtained by a two-step heat treatment process. Research findings indicate that with the increase of Al₂O₃/SiO₂ mole ratio， Q³ and Q⁴ units within the glass network transform into Q¹ and Q² units， and this apparent change is essentially caused by the disturbance caused by the increase of ［AlO₄］. The coefficient of thermal expansion gradually rises from 5.31×10^-6℃^-1 to 5.98×10^-6 ℃^-1， with a incremental tendency. The crystal morphology evolves from spherical to irregular， and finally to a honeycomb structure. The crystal phase changes from Li _x Al _x Si_3-_x O₆， MgAl₂Si₄O₁₂， and SiO₂ to Li _x Al _x Si_1-_x O₂， MgAl₂Si₄O₁₂， LiAlSi₃O₈， and SiO₂， and ultimately to LiAlSi₂O₆， and Li _x Al _x Si_1-_x O₂. The mechanical property tests show that the maximum Vickers hardness of glass-ceramics is 8.89 GPa， and the subsequent decay of the performance is mainly attributed to the transition of crystal phase and the evolution of the microscopic morphology of the crystal to honeycomb structure.

Key words: aluminosilicate glass, Al₂O₃/SiO₂, glass network structure, mechanical property, microstructure, crystallization process

CLC Number:

TQ171.79

JIA Xuhe, ZHAO Renlong, ZHANG Jihong, XIE Jun. Effect of Al₂O₃/SiO₂ on Crystallization Behaviour and Mechanical Properties of Li₂O-Al₂O₃-SiO₂-MgO Glass-Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(3): 845-852.

Figures/Tables 10

Table 1 Chemical composition of LASM glass-ceramics

Sample No.	Mole fraction/%
Sample No.	SiO₂	Al₂O₃	Li₂O	MgO	P₂O₅	ZrO₂	Na₂O
B1	70.3	4.3	16.1	5.4	0.9	2.8	0.2
B2	68.3	6.3	16.1	5.4	0.9	2.8	0.2
B3	66.3	8.3	16.1	5.4	0.9	2.8	0.2
B4	64.3	10.3	16.1	5.4	0.9	2.8	0.2

Fig.1 XRD patterns of glass samples with different Al2O3/SiO2 mole ratios

Fig.2 FTIR spectra and 27Al MAS-NMR spectra of glass samples with different Al2O3/SiO2 mole ratios

Fig.3 Raman spectrum of glass samples with different Al2O3/SiO2 mole ratios， Gaussian fitting of Raman spectral peaks for Q n analysis， and calculated Q n group peak fitting results for different ratios

Fig.4 DSC curves of glass samples with different Al2O3/SiO2 mole ratios

Table 2 Tg and Tp of glass samples with different Al2O3/SiO2 mole ratios

Sample No.	B1	B2	B3	B4
T_g/℃	568	584	607	631
T_p1/℃	784	791	796	798
T_p2/℃	809	819	831	842

Fig.5 Thermal expansion curves and variations in CTE of glass samples with different Al2O3/SiO2 mole ratios

Fig.6 XRD patterns of glass-ceramic samples with different Al2O3/SiO2 mole ratios

Fig.7 SEM images of cross-sections of glass-ceramic samples with different Al2O3/SiO2 mole ratios

Fig.8 Vickers hardness of glass and glass-ceramic samples with different Al2O3/SiO2 mole ratios

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Effect of Al₂O₃/SiO₂ on Crystallization Behaviour and Mechanical Properties of Li₂O-Al₂O₃-SiO₂-MgO Glass-Ceramics

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