Optimized structural and mechanical properties of borophosphate glass |
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Affiliation: | 1. Institute of Nanoscience & Nanotechnology, Kafrelshiekh University, Kafrelshiekh, Egypt;2. Glass Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt |
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Abstract: | A series of phosphate glasses composed of (65-x)P2O5–15BaO–5Al2O3–5ZnO–10Na2O-xB2O3 (x = 0, 2, 4, 6, and 8 mol%) were successfully prepared using the melt-quenching method. The effects of the addition of boron trioxide (B2O3) on the physical, structural, and mechanical properties of the glasses were investigated. As the added content of B2O3 increased from 0 to 6 mol%, the glass exhibited increased density and transition temperature, and decreased molar volume, indicating optimization of the glass stability. Raman spectroscopy revealed that the introduction of B2O3 transformed the glass from a chain structure to a three-dimensional network structure, which enhanced the chemical stability of the glass by the cross-linking of long phosphate chains with boron ions. Regarding the mechanical properties, when the boron content was 6 mol%, the flexural strength of the glass was 41% higher than that of the undoped boron, while the Vickers hardness and Knoop hardness values increased by 20.58% and 7.05%, respectively, and the fracture toughness was slightly decreased. In general, improving the mechanical properties of phosphate glass is of great significance for increasing the applications of this glass. |
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Keywords: | Phosphate glass Melt-quenching method Hardness Fracture toughness |
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