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Characterization of electric discharge machining, subsequent etching and shot-peening as a surface treatment for orthopedic implants
Faculty
Science
Year:
2013
Type of Publication:
Article
Pages:
73-78
Authors:
Mhaede, Mansour, Strasky, Josef, Havlikova, Jana, Bacakova, Lucie, Harcuba, Petr, Janecek, Milos
DOI:
10.1016/j.apsusc.2013.02.053
Journal:
APPLIED SURFACE SCIENCE ELSEVIER SCIENCE BV
Volume:
281
Research Area:
Chemistry; Materials Science; Physics
ISSN
ISI:000322064600013
Keywords :
Ti-6Al-4V alloy, Surface treatment, Cell proliferation, Fatigue performance, Orthopedics
Abstract:
Presented work aims at multi-method characterization of combined surface treatment of Ti-6Al-4V alloy for biomedical use. Surface treatment consists of consequent use of electric discharge machining (EDM), acid etching and shot peening. Surface layers are analyzed employing scanning electron microscopy and energy dispersive X-ray spectroscopy. Acid etching by strong Kroll's reagent is capable of removing surface layer of transformed material created by EDM. Acid etching also creates partly nanostructured surface and significantly contributes to the enhanced proliferation of the bone cells. The cell growth could be positively affected by the superimposed bone-inspired structure of the surface with the morphological features in macro-, micro- and nano-range. Shot peening significantly improves poor fatigue performance after EDM. Final fatigue performance is comparable to benchmark electropolished material without any adverse surface effect. The proposed three-step surface treatment is a low-cost process capable of producing material that is applicable in orthopedics. (C) 2013 Elsevier B. V. All rights reserved.
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