Niobium treated by Plasma Electrolytic Oxidation with calcium and phosphorus electrolytes

Pereira, Bruno Leandro; Luz, Aline Rossetto da; Lepienski, Carlos Maurício; Mazzaro, I.; Kuromoto, Neide K.

doi:10.1016/j.jmbbm.2017.08.010

Cited by 34 publications

(21 citation statements)

References 48 publications

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“…Areas with the smallest and flat-like pores (hole formation) are similar to the morphology observed in pure titanium treated by PEO using the same electrolyte [55]. Areas with the largest and prominent pores (volcano formation) are comparable with those produced on niobium PEO treated with phosphoric acid plus hydrogen peroxide [46]. Differently from titanium, in the niobium oxidation process, there is a previous formation before the volcano formation.…”

Section: Resultssupporting

confidence: 59%

“…In the XRD pattern of the Ti-25Nb-25Ta, the hogback is related to the natural oxide that forms spontaneously over the alloy exposed to environments containing oxygen. Typically, is observed that the PEO treatment produces crystalline oxides on Ti, Nb, Ta, and their alloys [30,[46][47][48]. The PEO micro-discharges causes local intense pressures and high temperatures, presenting a high degree of temperature variation.…”

Section: Resultsmentioning

confidence: 99%

“…The "hogback" in the 17°-30° range corresponds to amorphous oxides. When the PEO treatments were carried out in phosphoric acid solution using constant voltage on Nb (under 350V) and Ti ( under 200V) there is a formation of an amorphous oxide or a poorly crystalline oxide [46,[50][51][52]. In anodic films (the stage before the coating formed by micro-discharges) were observed the crystalline oxide formed most easily at the metal/oxide than the oxide growth at the oxide/electrolyte interface.…”

Section: Resultsmentioning

confidence: 99%

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Ti-25Nb-25Ta alloy treated by plasma electrolytic oxidation in phosphoric acid for implant applications

Beilner

Pereira²,

Lepienski

et al. 2021

Matéria (Rio J.)

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Among titanium alloys with non-toxic elements, the Ti-25Nb-25Ta alloy has good elastic behavior for applications in osseous implants, biocompatibility, and excellent corrosion resistance. The present study aimed to better the biocompatibility characteristics of Ti-25Nb-25Ta alloy modifying its surface through Plasma Electrolytic Oxidation (PEO) treatment. The formed oxide coating is amorphous and composed of two distinct porous formations: smaller hole-shaped pores and larger volcano-like pores. The regions with the formation of smaller pores and in the hole shaped presented the highest atomic percentage of the chemical element phosphorus. Nanoindentation tests have shown that the hardness of the Ti-25Nb-25Ta alloy is slightly lower than the commercially pure grade 2 titanium (a material used as reference), while elastic modulus measurements of Ti-25Nb-25Ta presented more suitable values for implant application (lower values when compared with titanium reference). After PEO treatment there were significant mechanical surface improvements (increased fairly surface hardness and decreased elastic modulus) for application in osseous tissue. Despite the Ti-25Nb-25Ta alloy presented excellent characteristics for applications in hard biological tissues, the PEO treatment better its features.

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Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Ti-25Nb-25Ta alloy treated by plasma electrolytic oxidation in phosphoric acid for implant applications

Beilner

Pereira²,

Lepienski

et al. 2021

Matéria (Rio J.)

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“…This fact can be emphasized observing data of others researches and our research group that have been observing the presence of phosphorous on the anodic surface seems improve the hydrophilicity. For porous films obtained by plasma electrolytic oxidation [24,35,36] it was observed that the incorporation of phosphorus plays decisive role to surface hydrophilicity.…”

Section: Resultsmentioning

confidence: 99%

“…The data of some researches showed that nanotubes grew in mixtures of the H 3 PO 4 plus fluorine ions are hydrophilic surfaces [29,33,34]. In the same way, the presence of phosphorus ions into electrolyte improved the wettability of films obtained by plasma electrolytic oxidation [24,35,36].…”

Section: Introductionmentioning

confidence: 95%

Characterization of the morphology, structure and wettability of phase dependent lamellar and nanotube oxides on anodized Ti-10Nb alloy

Luz

Santos

Lepienski

et al. 2018

Applied Surface Science

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Nanotubes grown on Ti and its alloys have been extensively investigated for the biomaterials applications, since these structures improve the surface biocompatibility and the corrosion resistance due to oxide formation. Some researchers showed that the microstructure of the pure Ti affect the morphology of nanotubes grown by anodic process. However, this subject is rarely investigated for nanotubes grown on Ti alloys. In the same way, nanostructured films formed by concomitant regions of tubes and lamellar structures hardly ever were reported. Investigations concerning these topics are required once beta titanium alloys are suitable candidates to replace the pure Ti and Ti-Al-V alloys for biomedical applications. Beta alloys composed of non-toxic elements (Nb, Ta, Mo) are biocompatible and have an excellent mechanical properties and corrosion resistance. The present work investigated questions regarding to the effect of microstructure of Ti-10Nb alloy on morphology of nanostructured film growth by anodization. The morphology, thickness, composition and atomic arrangement (amorphous/crystalline) of formed oxides, and the contact angle of anodic film were investigated. The X-ray diffraction patterns and SEM image show that the Ti-10Nb alloy is composed by alpha (hcp) and beta (bcc) phases. SEM and TEM techniques revel that self-organized nanotubes grew on alpha phase, whereas a lamellar structure with transversal holes grew on b-phase. Crystalline oxides are formed at oxide-metal interface, as indicated by X-ray diffraction patterns. However, the tubes and lamellas grown over the compact oxide are amorphous, as-prepared and annealed at 230°C for 3 h, as showed by SAED patterns. The nanostructured films annealed at 430°C and at 530°C were damaged. A few changes were observed in XRD patterns of film annealed at 230°C while the morphology held similar as the unannealed film. Finally, the presence of phosphorus ions incorporated into the anodic layer makes the surface hydrophilic, since a similar nanostructured film without phosphorous incorporation results hydrophobic.

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Alumina Coatings Containing Niobium Pentoxide Polymorphs Prepared by Plasma Electrolytic Oxidation of Aluminum

et al. 2023

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Niobium treated by Plasma Electrolytic Oxidation with calcium and phosphorus electrolytes

Cited by 34 publications

References 48 publications

Ti-25Nb-25Ta alloy treated by plasma electrolytic oxidation in phosphoric acid for implant applications

Ti-25Nb-25Ta alloy treated by plasma electrolytic oxidation in phosphoric acid for implant applications

Characterization of the morphology, structure and wettability of phase dependent lamellar and nanotube oxides on anodized Ti-10Nb alloy

Alumina Coatings Containing Niobium Pentoxide Polymorphs Prepared by Plasma Electrolytic Oxidation of Aluminum

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