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

Abstract

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.

Keywords

aluminosilicate glass / short-range structure / molecular dynamics simulations / tensile strength

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