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<p>The effects of different Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> (Al/Si) ratios on the structure and tensile strength of Na<sub>2</sub>O-CaO-MgO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> glass fiber were investigated by Raman, tensile strength tests and molecular dynamics simulation. The results showed that Al<sup>3+</sup> mainly existed in the form of [AlO<sub>4</sub>] within the glass network. With the increase of Al/Si ratio, the Si-O-Al linkage gradually became the main connection mode of glass network. The increase of bridging oxygen content and variation of <i>Q</i><sup>n</sup> indicated that a higher degree of network polymerization was formed. The tensile strength of the glass fibers obtained through experiments increased from 2 653.56 to 2 856.83 MPa, which was confirmed by the corresponding molecular dynamics simulation. During the stretching process, the Si-O bonds in the Si-O-Al linkage tended to break regardless of the compositional changes, and the increase of fractured Si-O-Al and Al-O-Al linkage absorbed more energy to resist the destroy.</p>

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Effect of Al2O3/SiO2 Ratio on the Structure and Tensile Strength of Glass Fiber by Experiment and Molecular Dynamics Simulation

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Junfeng Kang,
  • Zhaozhi Xu,
  • Shengyun Yang,
  • Zeyu Kang,
  • Wenkai Gao,
  • Yi Cao,
  • Zhiyao Tang,
  • Yongyan Li,
  • Yunlong Yue

摘要

The effects of different Al2O3/SiO2 (Al/Si) ratios on the structure and tensile strength of Na2O-CaO-MgO-Al2O3-SiO2 glass fiber were investigated by Raman, tensile strength tests and molecular dynamics simulation. The results showed that Al3+ mainly existed in the form of [AlO4] within the glass network. With the increase of Al/Si ratio, the Si-O-Al linkage gradually became the main connection mode of glass network. The increase of bridging oxygen content and variation of Qn indicated that a higher degree of network polymerization was formed. The tensile strength of the glass fibers obtained through experiments increased from 2 653.56 to 2 856.83 MPa, which was confirmed by the corresponding molecular dynamics simulation. During the stretching process, the Si-O bonds in the Si-O-Al linkage tended to break regardless of the compositional changes, and the increase of fractured Si-O-Al and Al-O-Al linkage absorbed more energy to resist the destroy.