Effect of boron oxide addition on fibre drawing, mechanical properties and dissolution behaviour of phosphate-based glass fibres with fixed 40, 45 and 50 mol% P2O5.
Bottom Line: The mechanical properties of the fibres were found to significantly increase with increasing B2O3 content.Initial loss of mechanical properties due to annealing was found to be recovered with degradation.Both annealed and non-annealed fibres exhibited a peeling effect of the fibre's outer layer during degradation.
Affiliation: Division of Materials, Mechanics and Structures, University of Nottingham, Nottingham, UK.Show MeSH
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Mentions: The dissolution profile of the non-annealed fibres in PBS at 37℃ up to the 28-day interval and the corresponding surface morphologies are shown in Figures 5 and 6. The change in tensile modulus of the fibres with degradation is listed in Table 3. These non-annealed B2O3-containing glass fibres could be tested up to 28-day interval of immersion, whilst it was not possible to test the non-B2O3-containing fibres after only 7 days of immersion as they were too brittle to handle. A peeling effect on the fibre surface was seen from day 14-degraded fibres. At the day-1 and -7 intervals, the tensile strength for these fibres was seen to decrease rapidly to almost half of their initial values. After 1-day immersion, the tensile strength for P40B5, P45B5 and P50B5 fibres had decreased from 771 ± 107, 1050 ± 165 and 983 ± 143 MPa to 286 ± 75, 308 ± 76 and 336 ± 61 MPa, respectively. With further increase in immersion time up to 28 days, a reduction in strength was observed for the B2O3-containing glass formulations. The tensile strength for the day-28 interval-degraded P40B5, P45B5 and P50B5 fibres was 448 ± 89, 710 ± 134 and 586 ± 47 MPa, respectively. Similar to the annealed fibres, no statistically significant change in tensile modulus was observed over the duration of the study.Figure 6.
Affiliation: Division of Materials, Mechanics and Structures, University of Nottingham, Nottingham, UK.