Bioactive borate glasses (from the system Na2O-CaO-B2O3-P2O5) and
corresponding glass-ceramics as a new class of scaffold material were
prepared by full replacement of SiO2 with B2O3 in Hench patented bioactive
glass. The prepared samples were investigated by differential thermal
analysis (DTA), Fourier transform infrared (FTIR) spectroscopy and X-ray
diffraction (XRD) analysis. The DTA data were used to find out the proper
heat treatment temperatures for preparation of the appropriate glass-ceramics
with high crystallinity. The prepared crystalline glass-ceramics derivatives
were examined by XRD to identify the crystalline phases that were
precipitated during controlled thermal treatment. The FTIR spectroscopy was
used to justify the formation of hydroxyapatite as an indication of the
bioactivity potential or activity of the studied ternary borate glasses or
corresponding glass-ceramics after immersion in aqueous phosphate solution.
The corrosion results are interpreted on the basis of suggested recent views
on the corrosion mechanism of such modified borate glasses in relation to
their composition and constitution.
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