Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1661189 | Surface and Coatings Technology | 2008 | 8 Pages |
Abstract
Thin calcium phosphate coatings with a thickness of 0.09 to 2.7 µm were prepared by radio-frequency magnetron sputtering deposition on NiTi and Ti substrates at a substrate temperature of 500 °C in argon atmosphere. Scanning electron microscopy (SEM) showed that the surface structure is uniform and dense without visible defects (pores and microcracks). Rutherford backscattering spectroscopy (RBS) and energy-dispersive X-ray spectroscopy (EDX) confirmed that the coating contains calcium, phosphorus, and oxygen with a uniform composition. Crystallographically, the coating consists of crystalline hydroxyapatite which is also supported by infrared spectroscopy. The mechanical characteristics of the coating were measured by nanoindentation (Vickers indenter), giving a nanohardness of 10 GPa and a Young's modulus of 110 GPa. The strength of adhesion of the calcium phosphate coating to the metallic substrates depended on the coating's thickness and decreased for a thickness larger than 1.6 µm. No difference was observed between NiTi and Ti substrates.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
V.F. Pichugin, R.A. Surmenev, E.V. Shesterikov, M.A. Ryabtseva, E.V. Eshenko, S.I. Tverdokhlebov, O. Prymak, M. Epple,