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Phosphate Porous Coatings Enriched with Selected Elements via PEO Treatment on Titanium and Its Alloys: A Review.

ABSTRACT: This paper shows that the subject of porous coatings fabrication by Plasma Electrolytic Oxidation (PEO), known also as Micro Arc Oxidation (MAO), is still current, inter alia because metals and alloys, which can be treated by the PEO method, for example, titanium, niobium, tantalum and their alloys, are increasingly available for sale. On the international market, apart from scientific works/activity developed at universities, scientific research on the PEO coatings is also underway in companies such as Keronite (Great Britain), Magoxid-Coat (Germany), Mofratech (France), Machaon (Russia), as well as CeraFuse, Tagnite, Microplasmic (USA). In addition, it should be noted that the development of the space industry and implantology will force the production of trouble-free micro- and macro-machines with very high durability. Another aspect in favor of this technique is the rate of part treatment, which does not exceed several dozen minutes, and usually only lasts a few minutes. Another advantage is functionalization of fabricated surface through thermal or hydrothermal modification of fabricated coatings, or other methods (Physical vapor deposition (PVD), chemical vapor deposition (CVD), sol-gel), including also reoxidation by PEO treatment in another electrolyte. In the following chapters, coatings obtained both in aqueous solutions and electrolytes based on orthophosphoric acid will be presented; therein, dependent on the PEO treatment and the electrolyte used, they are characterized by different properties associated with their subsequent use. The possibilities for using coatings produced by means of plasma electrolytic oxidation are very wide, beginning from various types of catalysts, gas sensors, to biocompatible and antibacterial coatings, as well as hard wear coatings used in machine parts, among others, used in the aviation and aerospace industries.

SUBMITTER: Rokosz K

PROVIDER: S-EPMC7321118 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Phosphate Porous Coatings Enriched with Selected Elements via PEO Treatment on Titanium and Its Alloys: A Review.

Rokosz Krzysztof K Hryniewicz Tadeusz T Dudek Łukasz Ł

Materials (Basel, Switzerland) 20200528 11

This paper shows that the subject of porous coatings fabrication by Plasma Electrolytic Oxidation (PEO), known also as Micro Arc Oxidation (MAO), is still current, inter alia because metals and alloys, which can be treated by the PEO method, for example, titanium, niobium, tantalum and their alloys, are increasingly available for sale. On the international market, apart from scientific works/activity developed at universities, scientific research on the PEO coatings is also underway in companies ...[more]

PMID: 32481746

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Project description:BackgroundThree-dimensional (3D) printing technology has been widely used in orthopedics; however, it is still limited to the change of macroscopic structures. In order to further improve the biological properties of 3D-printed porous titanium scaffolds, this study introduced micro-arc oxidation (MAO) technology to modify the surface of porous titanium scaffolds and construct bioactive coatings on the surface of porous titanium scaffolds to improve the biocompatibility and osseointegration ability of the material.MethodsFor in vitro experiments, human bone marrow stem cells (hBMSCs) were seeded onto untreated scaffolds (control group) and MAO-treated scaffolds (experimental group). After 24 h of co-culture, cytotoxicity was observed using live/dead staining, and cell/scaffold constructs were retrieved and processed for the assessment of cell morphology by using scanning electron microscopy (SEM). Cell proliferation was detected using the Cell Counting Kit-8 (CCK-8) assay after 3, 7, and 14 days of co-culture. The levels of alkaline phosphatase (ALP) in the cell supernatant were detected after 7 and 14 days of co-culture. For in vivo experiments, micro-computed tomography (micro-CT) and Masson Goldner's staining were used to evaluate bone ingrowth and osseointegration at 4 and 8 weeks postoperatively.ResultsIn vitro experiment results confirmed that the two groups of scaffolds were non-cytotoxic and the cell adhesion status on the MAO-treated scaffolds was better. Over time, cell proliferation and ALP levels were higher in the MAO-treated group than in the untreated scaffolds. In the in vivo experiments, the MAO-treated scaffolds showed better bone ingrowth and osseointegration than the untreated group at different time points.ConclusionsThe MAO-treated porous titanium scaffold formed a uniform and dense bioactive coating on the surface, which was more conducive to cell adhesion, proliferation, and differentiation and showed better osseointegration and bone ingrowth in vivo.

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Phosphate Porous Coatings Enriched with Selected Elements via PEO Treatment on Titanium and Its Alloys: A Review.

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Phosphate Porous Coatings Enriched with Selected Elements via PEO Treatment on Titanium and Its Alloys: A Review.

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