Influence of annealing temperature on RF magnetron sputtered calcium-phosphate-coatings
| Autor: | K. van Dijk, J. G. C. Wolke, H.G. Schaeken, John A. Jansen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1996 |
| Předmět: |
Calcium Phosphates
Time Factors Materials science Chemical Phenomena Annealing (metallurgy) Biophysics Analytical chemistry Biocompatible Materials Bioengineering engineering.material Biomaterials Magnetics chemistry.chemical_compound X-Ray Diffraction Coating Sputtering Fourier transform infrared spectroscopy Calcium oxide Chemistry Physical Temperature Water Sputter deposition Rutherford backscattering spectrometry Amorphous solid Durapatite chemistry Development of a magnetron sputterproces for the preparation of ceramic coatings on implant materials Mechanics of Materials Ceramics and Composites engineering Onderzoek naar de toepasbaarheid van een magnetron sputter-proces voor de vervaardiging van keramische deklagen op implantatiematerialen |
| Zdroj: | Biomaterials, 17, 405-410 Biomaterials, 17, pp. 405-410 |
| ISSN: | 0142-9612 |
| Popis: | The effect of different annealing temperatures on the characteristics of thin calcium phosphate coatings fabricated by radiofrequency magnetron sputtering was studied. Annealing of the as-sputtered films was necessary to change the amorphous coating to a crystalline coating. The films were annealed for 2 and 4 h at 400, 600, 800, 1000 and 1200 degrees C under dry argon or argon and water vapour flow. After annealing, the structure and the chemical composition of these films were characterized with incident light microscopy, Rutherford backscattering spectrometry (RBS), X-ray diffraction (XRD), and Fourier transform infrared absorption spectrometry (FTIR). Incident light microscopy showed cracks in the coatings annealed at a higher temperature than 400 degrees C. RBS revealed that the as-sputtered coatings had a high Ca/P ratio which decreased with increasing annealing temperature. After annealing at a temperature of 600 degrees C or more the XRD showed crystalline hydroxyapatite (HA) coatings. However, the second phase, present in the coatings, changed from tetra-calcium phosphate to calcium oxide to beta-tri-calcium phosphate with increasing annealing temperature. FTIR measurements showed the existence of OH- and PO- bonds in all coatings, although the PO- bonds varied for different annealed coatings, from the PO- bonds due to HA to PO- bonds due to other calcium phosphates. From the results of this study we suggest that 600 degrees C is probably the best annealing temperature to obtain a better characterization and understanding of the coating. |
| Databáze: | OpenAIRE |
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