Bioactivity, Physical and Chemical Properties of some Bioactive Phosphate Glasses Doped with B2O3

Amany A. ElKheshen and Rawhia L. Elwan

Three bio-phosphate glass-specimens with and without B2O3 addition were prepared in order to shed light on their bioactivity behavior towards the simulated body fluid biological solution (SBF). The results revealed that B2O3 has significant effect on the ability of bio-glass to form the hydroxyl carbonate apatite layer on its surface. That layer was detected by FTIR spectra, SEM Micrographs and ICP analysis. Also, the effect of B2O3 on the mechanical properties was studied by measuring the hardness of the glass samples. The hardness increased by adding 5wt. % B2O3 then decreased by increasing this percent to 10wt%. Also, the thermal expansion coefficient was decreased by adding 5wt. % B2O3 to the phosphate glass then decreased by increasing that percent to 10wt. %. The chemical durability of the samples towards alkaline and acidic solutions was studied. The rate of dissolution of the samples containing 5wt. % B2O3 was low then increased by increasing the B2O3to10wt. % in glass, but the density increases by adding 5wi. % B2O3 to glass samples then decreased by increasing the B2O3 to 10 wt%. Keywords: Bioactive glass. FTIR, SEM, chemical durability, thermal and mechanical properties.