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Preparation of Calcium Phosphate Alumina Nano Biocomposites

Moshkforoush, Arash | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41407 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali; Behnam, Ghader
  7. Abstract:
  8. The purpose of this study was aimed to evaluate the effect of Alumina on the sintering, phase development, mechanical properties and biocompatibility of fluoridated hyroxyapatite sintered via conventional furnace and microwave assisted oven. Green compacts having 30wt% Alumina nanoparticles were sintered without pressure at various temperatures (1000-1400°C) for one hour in conventional furnace. Phase composition, thermal behavior and morphological analyses were performed using X-ray diffraction (XRD), simultaneous thermogravimetry and differential thermal analysis (STA), and Scanning Electron Microscopy (SEM), respectively. With the increase in temperature and the Alumina content, severe decompositions occurred, resulting in poor densification and consequently low mechanical properties. Subsequently, bodies were sintered at 1100 and 1200°C for 1, 3 and 8 hours in conventional furnace in order to control the decomposition rate and to achieve higher densifications. The results obtained from composites sintered at 1200°C for 3 hours were most satisfactory among other temperatures and periods of time. Composites having various amounts of Alumina (10-30 wt%) were then sintered at 1200°C for 3 hours in conventional furnace and for 15 minutes in microwave assisted oven. Microwave assisted sintering was found to be a promising sintering method taking into account its advantages in preparation of fine-grained microstructures and enhanced mechanical properties with respect to conventional sintering methods. Additionally, Mouse fibroblast cells (Mouse C34/connective tissue-L929) showed better proliferation behavior and higher number of viable cells on the microwave sintered composites compared to those sintered via conventional furnace.
  9. Keywords:
  10. Alumina ; Biocompatibility ; Nanocomposite ; Microwave Sintering ; Flouridated Hydroxyapatite

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