Dense fine-grained biphasic calcium phosphate (BCP) bioceramics designed by two-step sintering

In this study, dense, fine-grained biphasic calcium phosphate bioceramics were designed via the two-step sintering method. The starting powder was nanosized calcium-deficient hydroxyapatite, whose phase composition, average particle size and morphology were characterized by XRD, FTIR, Raman spectros...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2011-01, Vol.31 (1), p.19-27
Main Authors: Lukic, M, Stojanovic, Z, Skapin, S D, Macek-Krzmanc, M, Mitric, M, Markovic, S, Uskokovic, D
Format: Article
Language:English
Subjects:
Apatite
Bioceramics
Calcium phosphate
Ceramics
Grain growth
Heating
Hydroxyapatite
Microstructure-final
Nanomaterials
Nanostructure
Shrinkage
Sintering (powder metallurgy)
Two-step sintering
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Summary:In this study, dense, fine-grained biphasic calcium phosphate bioceramics were designed via the two-step sintering method. The starting powder was nanosized calcium-deficient hydroxyapatite, whose phase composition, average particle size and morphology were characterized by XRD, FTIR, Raman spectroscopy, laser diffraction and FE-SEM. The phase transformations of the initial powder during heating up to 1200 °C were examined using TG/DSC. At first, conventional sintering was performed and the recorded shrinkage/densification data were used to find out the appropriate experimental conditions for two-step sintering. The obtained results show that two-step sintering yields BCP ceramics, consisting of hydroxyapatite and β-TCP, with full dense, homogeneous structure with average grain size of 375 nm. Furthermore, BCP ceramics obtained by the two-step sintering method exhibit improved mechanical properties, compared to conventionally sintered BCP.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2010.09.006