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Sintering Improvement of Nano Hydroxyapatite Bodies by Magnesium Incorporation and Using Microwave Sintering

Ghods, Amin | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41982 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnejhad, Khatiboleslam; Behnam Ghader, Ali Asghar
  7. Abstract:
  8. Magnesium is one of most important elements in bio hedroxyapatite. Magnesium effects on all stages of bone growth metabolism. Also increases bone’s osteoblastic and osteoclastic activities. That’s why incorporation of Mg ions into hudroxyapatite structure has become one of interesting fields for bone implants production. In addition Mg can improve sintering and mechanical properties of HAp. Thet’s why in this investigation the effect of incorporated Mg into HAp structure has been studied. Three kinds of powders have been prepared to perform this study. Pure HAp nano powder produced via sol-gel method, Mg contain HAp nano powder produced via sol-gel method and a mixture of nano HAp and nano MgO powders that in this case incorporation of Mg into HAp structure is done during the sintering stage. Pressed green bodies obtained from three kinds of powders have been sintered between 1100 and 1400°C in furnace and via microwave method. XRD, SEM and EDX analysis have been done on sintered specimens. Then relative density, micro hardness and percentage of remained porosity have been calculated. The only secondary phase observed in specimens sintered above 1300°C was β-TCP. Amount of β-TCP in furnace sintered bodies was more than that in microwave sintered bodies. Also amount of β-TCP has increased with increasing of sintering temperature. Sintering has an acceptable progress in temperatures above 1100°C and after sintering below that temperature amount of remained porosities were high. With increasing sintering temperature to 1300°C, micro hardness and relative density, which has been calculated via Archimedes method, have increased. The maximum amounts were belonging to specimens produced from mixture of HAp and MgO and sintered in 1300°C
  9. Keywords:
  10. Nanopowder ; Hydroxyapatite ; Magnesium ; Microwave ; Microwave Sintering

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