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Hydroxyapatite nanocomposites: Synthesis, sintering and mechanical properties

Aminzare, M ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2012.09.023
  3. Publisher: 2013
  4. Abstract:
  5. Two different hydroxyapatite based composites reinforced by oxide ceramic (20 wt%) nano crystals were synthesized by high-energy ball milling and sintered by pressure less technique. Alumina and titania nanoparticles as secondary phases improved densification and mechanical behavior of apatite and postponed its decomposition to the tricalcium phosphate (TCP) phases at elevated temperatures. Increasing the relative density of apatite using nano reinforcements leads to enhance the bending strength by more than 40% and 27% (as compared to the pure HA) and increase the hardness from 2.52 to 5.12 (Al2O3 composite) and 4.21 (TiO2 addition) GPa, respectively. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction spectroscopy were employed to study morphologies, fracture surfaces and phase compositions, respectively. The morphological study and micro structural analysis confirm the X-ray diffraction and relative density diagrams
  6. Keywords:
  7. A. Sintering ; B. Nanocomposites ; C. Mechanical properties ; Elevated temperature ; Fracture surfaces ; High-energy ball milling ; Mechanical behavior ; Morphological study ; Nano-reinforcements ; Oxide ceramics ; Relative density ; Secondary phasis ; TiO ; Titania nanoparticles ; Transmission electron microscopy tem ; Tricalcium phosphates ; X-ray diffraction spectroscopy ; Alumina ; Apatite ; Ball milling ; Hydroxyapatite ; Mechanical properties ; Nanocomposites ; Reinforcement ; Scanning electron microscopy ; Titanium dioxide ; Transmission electron microscopy ; X ray diffraction ; Sintering
  8. Source: Ceramics International ; Volume 39, Issue 3 , April , 2013 , Pages 2197-2206 ; 02728842 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0272884212008735