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

JF Kang and ZZ Xu and SY Yang and ZY Kang and WK Gao and Y Cao and ZY Tang and YY Li and YL Yue, JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY- MATERIALS SCIENCE EDITION, 40, 1251-1261 (2025).

DOI: 10.1007/s11595-025-3164-y

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.

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