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Open AccessFeature PaperArticle

Plasma Electrolytic Oxidation (PEO) Layers from Silicate/Phosphate Baths on Ti-6Al-4V for Biomedical Components: Influence of Deposition Conditions and Surface Finishing on Dry Sliding Behaviour

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Imperial College, Tribology Group, SKF University Technology Centre (UTC), 456 City and Guilds Building, South Kensington Campus, London SW7 2AZ, UK
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Industrial Research Centre for Advanced Mechanics and Materials (CIRI-MAM), Alma Mater Studiorum—University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
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Department of Industrial Engineering (DIN), Alma Mater Studiorum—University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
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NanoSurfaces Industries srl, Via Bruno Buozzi 13, 40057 Cadriano di Granarolo nell’Emilia (BO), Italy
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Author to whom correspondence should be addressed.
Coatings 2019, 9(10), 614; https://doi.org/10.3390/coatings9100614
Received: 26 August 2019 / Revised: 19 September 2019 / Accepted: 23 September 2019 / Published: 26 September 2019
(This article belongs to the Special Issue Tribological Behavior of Functional Surface: Models and Methods)
Plasma Electrolytic Oxidation (PEO) layers were produced on Ti-6Al-4V in different conditions, so as to assess the influence of layer structure, current mode, duty cycle and surface finishing on microstructural features and tribological behaviour. In DC regime, the double-layer structure (silicate bath followed by phosphate bath) beneficially affected wear resistance. In unipolar pulsed DC (phosphate bath), the wear resistance of single layers improved with increasing duty cycle, due to improved microstructure and adhesion: high duty cycle single layers can be considered an alternative to double-layer deposition. Surface finishing by abrasive blasting with spheroidal glass beads leads to surface roughness decrease and hence to decreased friction and improved wear resistance. The best-performing PEO layers showed promising results in the comparison with reference materials such as CoCrMo (both uncoated and (Ti,Nb)N PVD-coated) and PVD-coated Ti-6Al-4V up to 30 N normal load. View Full-Text
Keywords: Plasma Electrolytic Oxidation (PEO); Ti-6Al-4V; friction; wear Plasma Electrolytic Oxidation (PEO); Ti-6Al-4V; friction; wear
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Bertuccioli, C.; Garzoni, A.; Martini, C.; Morri, A.; Rondelli, G. Plasma Electrolytic Oxidation (PEO) Layers from Silicate/Phosphate Baths on Ti-6Al-4V for Biomedical Components: Influence of Deposition Conditions and Surface Finishing on Dry Sliding Behaviour. Coatings 2019, 9, 614.

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