Investigation of Effect of Heat Treatment on Produced Phases in 45S5 Glass-Ceramics Synthesized in the Forms of Powder and Pellet, and Investigation of Their Bioactivity

45S5 bioglass was synthesized by solid state reaction method using sodalime glass, calcium carbonate, sodium carbonate and phosphor pentoxide. XRF analysis was used to determine the glass composition, and Based on its results, the required amounts of other precursors were calculated and added to sodalime glass powder in order to obtain 45S5 composition. After that samples in the forms of powder and pellet were heat treated at different temperatures (800-1000ºC). DTA and XRD analysis were done to investigate thermal and phase properties of the samples. Crystallization temperature was determined to be 690ºC. Ca2Na2Si3O9 and CaNaPO4 crystalline phases were detected in all the samples. In-vitro bioactivity of samples was investigated by immersion of samples in SBF solution and further study of them by XRD and SEM analysis. Bioactivity of the samples was proved by determining HA layer formation on their surfaces. Results showed that Heat treatment temperature had more significant effect on the formation of crystalline phases than its time. Bioactivity of the sample heat treated at 1000ºC for 8hr was better than other samples heat treated at lower temperatures.