Synthesis of nano-size
hydroxyapatite (HAp) powders by mechanical alloying.
Authors: Hong, S.J., Bhatt, H., Suryanarayana,
C., and Kalita, S.J
Year of Publication: 2005
Published in: Advances
in Bioceramics and Biocomposites, Proceedings of 29th International Conference on
Advanced Ceramics and Composite, Cocoa Beach, FL, D. Zhu and W. M. Kriven,
Editors; CESP,
Vol. 26, Issue 6, p33-39.
ABSTRACT
Nano hydroxyapatite (Ca10(PO4)6(OH)2,
HAp) powders were synthesized by solid-state reaction of Ca(OH)2 and
P2O5 mixtures in a high-energy SPEX 8000 shaker mill,
using hardened steel vial and balls. The phase analysis was carried out using
X-ray powder diffraction technique. Transformation of Ca(OH)2
and P2O5 mixture to HAp phase was first observed
after 1 h of milling. The powder milled for 3 h showed prominently the presence
of HAp phase. TEM analysis revealed that as-synthesized HAp powder was in the
range of 20-60 nm. Measured quantities of synthesized nano-powders were pressed
uniaxially in a steel mold to prepare dense ceramic structures for
densification studies. These green structures were subjected to sintering
studies at 1300 oC for 6 h when the
highest sintered density of 3.17 g/cc was achieved. © 2005
American Ceramic Society.
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