Journal
SURFACE & COATINGS TECHNOLOGY
Volume 202, Issue 16, Pages 3913-3920Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2008.01.038
Keywords
calcium phosphate coating; rf-magnetron sputtering; adhesion strength
Ask authors/readers for more resources
Thin calcium phosphate coatings with a thickness of 0.09 to 2.7 mu m were prepared by radio-frequency magnetron sputtering deposition on NiTi and Ti substrates at a substrate temperature of 500 degrees 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 mu m. No difference was observed between NiTi and Ti substrates. (C) 2008 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available