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Densification Behavior and Mechanical Properties of Biomimetic Apatite Nanocrystals

Author(s): A. Eskandari, M. Aminzare, H. Hassani, H. Barounian, S. Hesaraki, S. K. Sadrnezhaad.

Abstract:

Nanocrystalline hydroxyapatite (nHA) of 50 nm average diameter and length to diameter ratio of > 3 was synthesized by biomimetic method. Non-isothermal sintering improved densification behavior and mechanical properties of apatite to 0.88 maximum fractional density, 70MPa bending strength, 148MPa compressive strength and 2.53GPa microhardness at sintering temperature of 1250° C. Higher sintering temperatures resulted in the decomposition of the apatite and in-situ biphasic calcium phosphate HAP/TCP formation. This process lowered apatite densification and weakened mechanical properties of the sintered specimen. Transmission electron microscopy (TEM), x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) helped to elucidate the structure/property correlations.

Keywords: Apatite, biomimetic, mechanical properties, nanocrystal, sintering, densification, biphasic calcium phosphate, HAP/TCP, osteointegrative applications, bending stress, hardness, compressive stress, grain size

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Article Details

VOLUME: 7
ISSUE: 5
Year: 2011
Page: [776 - 780]
Pages: 5
DOI: 10.2174/157341311797483646
Price: $58