Preparation and Characterization of Cobalt Oxide Doped 45S5 Bioactive Glass-Ceramics

The Hench bio-glass® has been selected for better comparison. The proposed glass-ceramic compositions [(45-X) SiO2+XCoO+24.5CaO+24.5Na2O+6P2O5 (where X= 0 to 2 wt %)] were melted at 1400 °C in platinum crucible in electric furnace with air as furnace atmosphere. The prepared glasses were converted to glass-ceramic by two step heat treatment process at their respective nucleation and crystallization temperatures. The formed crystalline phases were determined by X-ray diffraction (XRD). Bioactivity of the glass-ceramic samples was analyzed by immersion in the simulated body fluid (SBF) for different time periods. The developed hydroxyl carbonate apatite (HCA) was identified by FTIR and pH behavior. Density and mechanical behavior of the samples was found to increase considerably with an increase in the concentration of cobalt oxide.