Ramesh, S and Tanb, C. Y. and Hamdib, M and Sopyanc, I and Tengd, W. D. (2007) The influence of Ca/P ratio on the properties of hydroxyapatite bioceramics. Proc. of SPIE Vol. 6423, 64233A,, 6423 . 64233A-6.
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The paper reports on the effect of Ca/P ratio (1.57, 1.67 and 1.87) on the densification behaviour of nanocrystalline hydroxyapatite (HA) prepared by a chemical precipitation method. Green compacts were prepared and sintered at temperatures ranging from 1000°C to 1350°C. The sintered samples were characterized to determine the HA phase stability, bulk density, hardness, fracture toughness and Young’s modulus. XRD analysis revealed that the phase stability was not disrupted throughout the sintering regime employed for HA having Ca/P ratio of 1.57 and 1.67. However, secondary phases were observed for HA having a Ca/P ratio of 1.87 when sintered at high temperatures. In general, regardless of Ca/P ratio, the HA bodies achieved > 95% relative density when sintered at 1100ºC–1250ºC. The results indicated that the stoichiometric HA (Ca/P ratio = 1.67) exhibited the overall best properties, with the highest hardness of 7.23 GPa and fracture toughness of 1.28 MPam1/2 being attained when sintered at 1000°C–1050°C.
|Subjects:||Material Science > Nanostructured materials|
|Deposited On:||07 Apr 2009 07:47|
|Last Modified:||07 Apr 2009 07:47|
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