Akademik Veri Yönetim Sistemi
JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY, cilt.58, sa.5, ss.1585-1601, 2022 (SCI-Expanded)
The aim of the present paper was to investigate the effect of alpha-lithium aluminate (alpha-LiAlO2) incorporation (1, 3, and 5 wt%) on the properties (grain morphology, activation energy for grain growth, decomposition behavior, shrinkage, densification, hardness, fracture toughness, brittleness index, compressive strength, and in vitro bioactivity) of bovine hydroxyapatite (BHA) sintered between 900 and 1300 degrees C. BHA without alpha-LiAlO2 incorporation exhibited the shrinkage of 12.02 +/- 0.52%, density of 2.86 +/- 0.47 g/cm(3), relative density of 90.77 +/- 1.51%, porosity of 1.12 +/- 0.75%, hardness of 4.19 GPa +/- 0.31, fracture toughness of 0.99 +/- 0.13 MPam(1/2), brittleness index of 4.24 +/- 0.31 mu(-1/2), and compressive strength of 115.75 +/- 4.27 MPa, when it was sintered at 1300 degrees C. It decomposed to beta- and alpha-tricalcium phosphate (beta- and alpha-TCP) as 4.7%, in totally. The activation energy for grain growth of pure BHA was calculated as 77.9 kcal/mol, as 57.61, 59.95, and 71.64 kcal/mol for 1, 3, and 5 wt% alpha-LiAlO2 incorporated BHAs, respectively. The highest properties for alpha-LiAlO2 incorporated BHAs were obtained at the sintering temperature of 1200 degrees C at amount of 5 wt% alpha-LiAlO2. For this composite, the density of 2.87 g/cm(3), fracture toughness of 1.95 +/- 0.18 MPam(1/2), compressive strength of 218.33 +/- 14.02 MPa, and brittleness index of 1.96 +/- 0.21 mu(-1/2) were obtained. As a result of the in vitro bioactivity test, the bioactivation for this composite became clearly visible in 14 days. The results show that the incorporation of 5 wt% alpha-LiAlO2 into BHA contributes to increasing the sinterability and properties of BHA without decreasing its bioactivity.