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<p>In current research, Li<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> glass-ceramics were prepared by conventional melt-quenching and subsequent heat treatment method. The effect of Al<sub>2</sub>O<sub>3</sub> content on microstructures, thermal properties, crystallization behaviours and mechanical properties were investigated. FTIR, Raman spectroscopy and nuclear magnetic resonance spectroscopy microstructure analysis showed that the silico-oxygen network was damaged, while the increase of [AlO<sub>4</sub>] content repaired the glass network, and finally made the glass network have better connectivity, with the decrease of SiO<sub>2</sub>. The thermal analysis confirmed the increasing glass transition and crystallization temperatures from growing Al<sub>2</sub>O<sub>3</sub> content. In addition, different crystal phases can be precipitated in the glass matrix, such as LiAlSi<sub>4</sub>O<sub>10</sub>, Li<sub>2</sub>Si<sub>2</sub>O<sub>5</sub> in glass with low Al<sub>2</sub>O<sub>3</sub> content, the combination of Li<sub><i>x</i></sub>Al<sub><i>x</i></sub>Si<sub>1−<i>x</i></sub>O<sub>2</sub>, LiAlSi<sub>3</sub>O<sub>8</sub>, Li<sub>2</sub>SiO<sub>3</sub> in glass with intermediate Al<sub>2</sub>O<sub>3</sub> content, and the combination of LiAlSi<sub>2</sub>O<sub>6</sub>, SiO<sub>2</sub> in glass with high Al<sub>2</sub>O<sub>3</sub> content. The hardness of as-prepared glass gradually increases with the increase of the Al<sub>2</sub>O<sub>3</sub> content. The Vickers hardness of the glass-ceramics is highly dependent on the Al<sub>2</sub>O<sub>3</sub> content in the glass and the heat treatment temperatures, reaching a maximum of 10.11 GPa. Scanning electron microscope images show that the crystals change from spherical to massive and finally to sheet. The change of glass structure, crystal phase and morphology is the main reason for the different mechanical properties.</p>

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Al2O3 Content Dependency on Microstructure, Crystallization Behavior and Mechanical Properties of Li2O-Al2O3-SiO2 Glass-ceramics

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Danni Li,
  • Yuyan Cai,
  • Chi Zheng,
  • Xuhe Jia,
  • Mengshuo Guo,
  • Jihong Zhang,
  • Jun Xie,
  • Jianjun Han

摘要

In current research, Li2O-Al2O3-SiO2 glass-ceramics were prepared by conventional melt-quenching and subsequent heat treatment method. The effect of Al2O3 content on microstructures, thermal properties, crystallization behaviours and mechanical properties were investigated. FTIR, Raman spectroscopy and nuclear magnetic resonance spectroscopy microstructure analysis showed that the silico-oxygen network was damaged, while the increase of [AlO4] content repaired the glass network, and finally made the glass network have better connectivity, with the decrease of SiO2. The thermal analysis confirmed the increasing glass transition and crystallization temperatures from growing Al2O3 content. In addition, different crystal phases can be precipitated in the glass matrix, such as LiAlSi4O10, Li2Si2O5 in glass with low Al2O3 content, the combination of LixAlxSi1−xO2, LiAlSi3O8, Li2SiO3 in glass with intermediate Al2O3 content, and the combination of LiAlSi2O6, SiO2 in glass with high Al2O3 content. The hardness of as-prepared glass gradually increases with the increase of the Al2O3 content. The Vickers hardness of the glass-ceramics is highly dependent on the Al2O3 content in the glass and the heat treatment temperatures, reaching a maximum of 10.11 GPa. Scanning electron microscope images show that the crystals change from spherical to massive and finally to sheet. The change of glass structure, crystal phase and morphology is the main reason for the different mechanical properties.