Akademik Veri Yönetim Sistemi
Türk Doğa ve Fen Dergisi, cilt.12, sa.3, ss.118-127, 2023 (Hakemli Dergi)
In this study, the effect of alumina (Al2O3) addition, varying between 1-10% by weight, on the properties of hydroxyapatite obtained from sheep femur bones (SHA) was investigated. SHA decomposed at all sintering temperatures and the total decomposition rate increased from 1.4% to 4.1% with increasing temperature. The decomposition rate of SHAs with Al2O3 added increased to 60.1% with increasing Al2O3 and sintering temperature. Density (from 2.16±0.03 to 2.98±0.02 g/cm3) and hardness (from 0.93±0.15 GPa to 3.90±0.27 GPa) of SHA increased with increasing temperatures, however; the highest compression strength (82±5.05 MPa) and fracture toughness (0.70±0.11 MPam1/2) were obtained at a temperature of 1200oC. Additions at amount of 1% and 2.5% Al2O3 to SHA contributed to obtaining better properties than 5% and 10%, however; the optimum Al2O3 ratio is 2.5% and the sintering temperature is 1200oC. With the addition of Al2O3 at amount of 2.5%, the fracture toughness value of SHA increased from 0.70±0.11 MPam1/2 to 1.70±0.15 MPam1/2, and the compression strength increased from 82±5.05 MPa to 207.85±5.85 MPa. The brittleness index of SHA increased from 1.70±0.27 to 7.10±0.50 μ-1/2 with increasing temperature. It increased to 3.56±0.18 μ-1/2 as the maximum value by the addition of Al2O3 to SHA. At the end of the 28-day immersion period, it was determined that, most of the SHA surface and the entire surface of the SHA-2.5Al2O3 composite were covered with apatite layer.