Dense fine-grained biphasic calcium phosphate (BCP) bioceramics designed by two-step sintering
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AuthorsLukić, Miodrag J.
Stojanović, Zoran S.
Škapin, Srečo Davor
Maček Kržmanc, Marjeta
Article (Published version)
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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.
Keywords:grain growth / microstructure / apatite / two-step sintering
Source:Journal of the European Ceramic Society, 2011, 31, 1-2, 19-27