Akademik Veri Yönetim Sistemi
Çetiner B. N., Erkmen Z. E. (Yürütücü)
Yükseköğretim Kurumları Destekli Proje, 2010 - 2012
Hydroxylapatite, titania and Bioglass 45S5 are the components generally used for the
production of bioactive biomaterials for years. In literature, although the binary composites with
the permutation of three components exist, a ternary composite has not yet been tried. Primarily,
Bioglass 45S5 was cast, its thermal analysis (Differential thermal analysis (DTA), dilatometric
analysis), phase analysis (X-Ray Diffraction (XRD) ), microstructural characterization (Scanning
Electron Microscopy (SEM) ) were performed. Then Bioglass 45S5 powder was ground to fine
powder to make its particle size closer to the hydroxylapatite and the titania powders. The particle
size of the powders were determined using the laser particle sizer. The DTAs of the 3 components,
separately and mixed, were performed. They were then mixed, and ball-milled during 24 hours for a
better homogenization. Following drying for 24 hours, pellets of 1 inch diameter were obtained
using unaxial manuel press and sintered at 1000, 1100, 1200 oC. Mechanical testing (compression
and microhardness), porosity measurement (The Archimèdes Method), phase determination (XRD)
and microstructural characterization (SEM) of the composites were then performed. As a
conclusion, when sintering temperature was increased, the porosity in the structure was decreased.
Between 1100 oC and 1200 oC, a phase transformation occurred. The results of microhardness (
24.6, 38.99, 316.2 HV (500gf for 15 sec) for the composites sintered at 1000, 1100, 1200 oC,
respectively) and subsequent compression tests (93.023±10.5, 298.14±78.074, 371.9684±38.36
MPa, respectively) approved the possible phase transformation between 1100 oC and 1200 oC
along with the XRD results.