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Soares, Paulo
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Publications (7/7 displayed)
- 2024Mechanical and Tribological Behavior of Nitrided AISI/SAE 4340 Steel Coated with NiP and AlCrN
- 2023Surface modification of biodegradable Mg alloy by adapting µEDM capabilities with cryogenically-treated tool electrodescitations
- 2022Plasma electrolytic oxidation up to four-steps performed on niobium and Nb-Ti alloyscitations
- 2020Crystallinity of TiO2 nanotubes and its effects on fibroblast viability, adhesion, and proliferationcitations
- 2020Titanium-Niobium (Ti-xNb) alloys with high Nb amounts for applications in biomaterials
- 2020Annealing Temperature Effect on Tribocorrosion and Biocompatibility Properties of TiO2 Nanotubescitations
- 2017In-vitro cell adhesion and proliferation of adipose derived stem cell on hydroxyapatite composite surfacescitations
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article
Plasma electrolytic oxidation up to four-steps performed on niobium and Nb-Ti alloys
Abstract
<p>Plasma electrolytic oxidation (PEO) of up to four steps were performed on Niobium (Nb), and binary Niobium-Titanium alloys (Nbx-Ti, x = 50%, 90 wt.%), and the resulting oxidized surfaces were compared to their respective metallic substrate. The first and third steps were carried out in the phosphorus electrolyte, whereas the second and fourth steps were oxidized in the electrolyte containing calcium ions. Coatings formed from the second step were porous, with the chemical composition containing both calcium and phosphorus elements. The PEO process decreased the elastic moduli to approximately 60 GPa and increased the surface cell viability compared to the metallic surfaces without treatment. All surfaces produced from the second step-PEO demonstrated improved characteristics for application in metallic implants. Additionally, those performed on the alloys in electrolytes containing phosphate ions (up to three steps) exhibited greater performance on cytocompatibility tests.</p>