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Hydrothermal crystallization of carbonate‐containing hydroxyapatite coatings prepared by radiofrequency‐magnetron sputtering method
Author(s) -
Nakamura Satoshi,
Hamagami JunIchi,
Yamashita Kimihiro
Publication year - 2007
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.30574
Subject(s) - materials science , simulated body fluid , crystallization , hydrothermal circulation , amorphous solid , sputter deposition , chemical engineering , titanium , apatite , annealing (glass) , carbonate , mineralogy , biocompatibility , coating , sputtering , metallurgy , thin film , composite material , nanotechnology , chemistry , crystallography , engineering
Carbonate‐containing hydroxyapatite (HA) films were prepared by low‐temperature hydrothermal annealing from carbonate‐containing calcium phosphate amorphous coatings on titanium substrates. The biocompatibility of the carbonate‐containing HA layers was estimated by in vitro tests using simulated body fluid (SBF). Precursory amorphous coatings were deposited with rf‐magnetron sputtering apparatus, using calcium phosphate glass target in Ar/CO 2 atmosphere. The carbonate‐containing HA coatings were successfully formed by the annealing at above 130°C for 20 h. On the basis of SEM observation, about 2‐μm thickness films coated rigidly were durable enough for the hydrothermal treatment. The coating layer was revealed to consist of single phase of PO 4 − and OH − partially carbonated HA by XRD and IR analyses. Overgrowing of bone‐like apatite layers on the carbonate‐containing HA surfaces in the SBF implied that the obtained films acquired a sufficient osteoconductivity, while it was still unclear that activity was enhanced, compared to pure HA coatings. The low‐temperature hydrothermal annealing method was effective for preparation of rigid HA coatings on titanium as well as modification of their chemical compositions. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007