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 tensile strength for annealed and degraded P40, P45 and P50 fibres is shown in Figure 4(a) to (c), respectively. The corresponding surface morphologies of the degraded fibres via SEM are shown in Figure 5. The change in tensile modulus of the fibres with degradation is listed in Table 3. From the glass formulations investigated, it was possible to handle and test fibres from the 5 and 10 mol% B2O3-containing glass fibres, which had been immersed for up to 60 days. However, it was not possible to test the non-B2O3-containing glass fibres after 21 days of immersion in PBS as the fibres became extremely brittle and broke when handled. Also, for these non-B2O3-containing glass fibres, no statistically significant difference (P > 0.05) in tensile strength was observed up to the day-21 interval. For the B2O3-containing glass fibres, no statistically significant difference (P > 0.05) in tensile strength was observed between day 0, 1 and 14-degraded fibres. However, the tensile strength of the day 21-degraded fibres was significantly higher (P < 0.0001) than the day 0 fibres. For P40B5, P45B5 and P50B5 fibres, the tensile strength of the day 14-degraded fibres was 62%, 38% and 38% higher than the day 0 fibres. However, the tensile strength for P40B10 and P45B10 at day 21 increased by 33% and 16% as compared to day 0. Further degradation of the B2O3-containing glass formulations revealed an increase in tensile strength values up to the day-45 interval and was then seen to decrease by the day-60 interval. However, the tensile strength of the day 60-degraded fibres was still significantly (P < 0.05) higher than the day 0 fibres. No statistically significant change in the fibre tensile modulus was observed over the same period of degradation (see Table 3). The corresponding SEM images of day 1, 14, 28 and 60-degraded fibres clearly showed a decrease in diameter with degradation over time.Figure 4.
Affiliation: Division of Materials, Mechanics and Structures, University of Nottingham, Nottingham, UK.