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<p>This study investigates the impact of systematic compositional variations on the structure, mechanical properties, thermal behaviour, and hydrolytic resistance of boroaluminosilicate glasses. Network-forming oxides (SiO<sub>2</sub>, B<sub>2</sub>O<sub>3</sub>), network modifiers (Na<sub>2</sub>O, K<sub>2</sub>O, CaO), and intermediate oxides (ZnO, Al<sub>2</sub>O<sub>3</sub>, BaO) were varied equimolarly. X-ray diffraction confirmed the amorphous nature of all samples. Hydrolytic resistance evaluated by ISO 719 showed differences in extract conductivity (2.2–8.2 <i>µ</i>S cm<sup>−1</sup>), with improved durability for Si+ and Al+ glasses. Density (2.38–2.52&#xa0;g&#xa0;cm<sup>−3</sup>) and glass transition temperature (<i>T</i><sub>g</sub> = 569–599&#xa0;°C) have opposite effects on network polymerization, confirmed by Raman spectroscopy. Mechanical testing showed small variations in hardness (5.14–5.28 GPa) and fracture toughness (0.71–0.73&#xa0;MPa·m<sup>1/2</sup>. The results highlight composition–structure–property relationships that can guide the design of borosilicate glasses with improved mechanical and chemical stability.</p>

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Impact of chemical composition on mechanical properties and hydrolytic resistance of boroaluminosilicate glasses

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月2日

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  • Branislav Hruška,
  • Aleksandra Nowicka,
  • Jaroslava Gombárová,
  • Terézia Sabadková,
  • Mária Chromčíková

摘要

This study investigates the impact of systematic compositional variations on the structure, mechanical properties, thermal behaviour, and hydrolytic resistance of boroaluminosilicate glasses. Network-forming oxides (SiO2, B2O3), network modifiers (Na2O, K2O, CaO), and intermediate oxides (ZnO, Al2O3, BaO) were varied equimolarly. X-ray diffraction confirmed the amorphous nature of all samples. Hydrolytic resistance evaluated by ISO 719 showed differences in extract conductivity (2.2–8.2 µS cm−1), with improved durability for Si+ and Al+ glasses. Density (2.38–2.52 g cm−3) and glass transition temperature (Tg = 569–599 °C) have opposite effects on network polymerization, confirmed by Raman spectroscopy. Mechanical testing showed small variations in hardness (5.14–5.28 GPa) and fracture toughness (0.71–0.73 MPa·m1/2. The results highlight composition–structure–property relationships that can guide the design of borosilicate glasses with improved mechanical and chemical stability.