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
Current Nanoscience
Title: Densification Behavior and Mechanical Properties of Biomimetic Apatite Nanocrystals
Volume: 7 Issue: 5
Author(s): A. Eskandari, M. Aminzare, H. Hassani, H. Barounian, S. Hesaraki and S. K. Sadrnezhaad
Affiliation:
Keywords: Apatite, biomimetic, mechanical properties, nanocrystal, sintering, densification, biphasic calcium phosphate, HAP/TCP, osteointegrative applications, bending stress, hardness, compressive stress, grain size
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.
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Cite this article as:
Eskandari A., Aminzare M., Hassani H., Barounian H., Hesaraki S. and K. Sadrnezhaad S., Densification Behavior and Mechanical Properties of Biomimetic Apatite Nanocrystals, Current Nanoscience 2011; 7 (5) . https://dx.doi.org/10.2174/157341311797483646
DOI https://dx.doi.org/10.2174/157341311797483646 |
Print ISSN 1573-4137 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6786 |
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