Effect of Al2O3 addition on bioactivity, thermal and mechanical properties of some bioactive glasses

Three bio-phosphate glass-specimens with and without Al2O3 addition were prepared in order to shed light on their bioactivity behavior towards the simulated body fluid biological solution (SBF). The results revealed that Al2O3 has significant effect on the ability of bio-glass to form the hydroxycarbonate apatite layer on its surface. That layer was detected by FTIR spectra, SEM micrographs and EDAX pattern. Also, the effect of Al2O3 on the mechanical properties was studied by measuring the hardness of the glass samples, which increased by Al2O3 addition. The thermal expansion coefficient was decreased by increasing the Al2O3 percent in the bio-glass samples.