Applying high voltage cathodic pulse with various pulse durations on aluminium via micro-arc oxidation (MAO)

Yılmaz, Mustafa Safa; Şahin, O.

doi:10.1016/j.surfcoat.2018.04.085

Cited by 28 publications

(18 citation statements)

References 21 publications

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“…There occurred 3 regimes with different pulse durations. It should also be noted that [6,[9][10][11] surface roughness was closely related with the coating thickness. The effect of pulse duration on the phase composition of MAO coatings was obtained by XRD analysis as given in Fig.…”

Section: Resultsmentioning

confidence: 96%

“…5. Due to the nature of the process the outer layer has a porous structure, which is mostly consisted of γ-Al2O3 phase, while the inner layer is a tighten structure and it is mostly consisted of α-Al2O3 phase [10,12]. This lamination may affect the hardness profile results by the distance from surface.…”

Section: Resultsmentioning

confidence: 99%

“…MAO system exists with two high frequency converters (HFC), which are separately for positive and negative polarity with power of 12,5 kW. These HFC's are working the range of voltage in between 0-800 V. The schematic picture of the MAO device is given in Fig.1 [10]. Bipolar pulse current mode was used in this research.…”

Section: Methodsmentioning

confidence: 99%

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Investigation of the High Energy Single Pulses Affect on Micro Arc Oxidation Process on Aluminium

Yılmaz¹,

Şahin²

2018

World Congress on Mechanical, Chemical, and Material Engineering

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Micro Arc Oxidation (MAO) was applied by using high anodic (500 volt) and high cathodic (500 volt) voltages with increasingly pulse duration couples (anodic and cathodic single pulses). While the increasing pulse duration, the single pulse energy was increased also. Due to the investigation of the single pulse affect, all other parameters were kept constant, such as duty cycle (8%), electrolyte temperature (25±5°C), electrolyte composition (KOH, Na2SiO3.5H2O), process time (20 minutes), anodic voltage, cathodic voltage and substrate. Five different anodic and cathodic pulse durations were applied. Scanning electron microscope (SEM), indenter, profilometer, eddy current, X-ray diffractometer were employed to investigate the microstructure, hardness, surface roughness, coating thickness and phase distribution of the coatings. The pore volume and distribution of the coating layers were analysed. Varying of pulse duration occurred significant differences among coating specifications. Coating layers with thickness between 50-90 μm and surface roughness between 3.1-5.2 μm were obtained. The hardness of coating layers was between 800-2000 Vickers. Coatings consist of two layers, inner dense layer and outer porous layer, which was a mixture of γ-Al2O3 and α-Al2O3.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Investigation of the High Energy Single Pulses Affect on Micro Arc Oxidation Process on Aluminium

Yılmaz¹,

Şahin²

2018

World Congress on Mechanical, Chemical, and Material Engineering

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“…However, certain problems like non-homogenous structure, micro-structural control problems, micro-cracks formation, the presence of phase impurity, poor adhesion strength were observed in these methods except for MAO technique [26][27][28]. Thus, implant application areas of the coatings produced by these techniques are limited.Micro-arc oxidation (MAO) is one of the most applicable methods to deposit a porous and rough bioceramic layer on valve metals such as Ti, Al, Mg, and Zr surfaces [3,[29][30][31]. The MAO coating promotes bioactivity, biocompatibility, wear and corrosion resistance respect to other surface coating methods [32][33][34][35][36][37][38][39].…”

mentioning

confidence: 99%

“…Micro-arc oxidation (MAO) is one of the most applicable methods to deposit a porous and rough bioceramic layer on valve metals such as Ti, Al, Mg, and Zr surfaces [3,[29][30][31]. The MAO coating promotes bioactivity, biocompatibility, wear and corrosion resistance respect to other surface coating methods [32][33][34][35][36][37][38][39].…”

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confidence: 99%

Characterization, Bioactivity and Antibacterial Properties of Copper-Based TiO2 Bioceramic Coatings Fabricated on Titanium

Durdu

2018

Coatings

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The bioactive and anti-bacterial Cu-based bioceramic TiO 2 coatings have been fabricated on cp-Ti (Grade 2) by two-steps. These two-steps combine micro-arc oxidation (MAO) and physical vapor deposition-thermal evaporation (PVD-TE) techniques for dental implant applications. As a first step, all surfaces of cp-Ti substrate were coated by MAO technique in an alkaline electrolyte, consisting of Na 3 PO 4 and KOH in de-ionized water. Then, as a second step, a copper (Cu) nano-layer with 5 nm thickness was deposited on the MAO by PVD-TE technique. Phase structure, morphology, elemental amounts, thickness, roughness and wettability of the MAO and Cu-based MAO coating surfaces were characterized by XRD (powder-and TF-XRD), SEM, EDS, eddy current device, surface profilometer and contact angle goniometer, respectively. The powder-and TF-XRD spectral analyses showed that Ti, TiO 2 , anatase-TiO 2 and rutile-TiO 2 existed on the MAO and Cu-based MAO coatings' surfaces. All coatings' surfaces were porous and rough, owing to the presence of micro sparks through MAO. Furthermore, the surface morphology of Cu-based MAO was not changed. Also, the Cu-based MAO coating has more hydrophilic properties than the MAO coating. In vitro bioactivity and in vitro antibacterial properties of the coatings have been investigated by immersion in simulated body fluid (SBF) at 36.5 • C for 28 days and bacterial adhesion for gram-positive (S. aureus) and gram-negative (E. coli) bacteria, respectively. The apatite layer was formed on the MAO and Cu-based MAO surfaces at post-immersion in SBF and therefore, the bioactivity of Cu-based MAO surface was increased to the MAO surface. Also, for S. aureus and E. coli, the antibacterial properties of Cu-based MAO coatings were significantly improved compared to one of the uncoated MAO surfaces. These results suggested that Cu-based MAO coatings on cp-Ti could be a promising candidate for biomedical dental implant applications.TiO 2 -based coatings have been suggested to improve corrosion resistance, bioactivity and biocompatibility of implant surfaces. They have recently received great attention for the biomedical applications owing to their more stable chemical composition [11,12]. TiO 2 were fabricated on cp-Ti by various surface coating methods including sol-gel [13], anodic oxidation [14], magnetron sputtering [15], electrophoretic deposition [16], acid etching [17,18], laser surface treatment [19], plasma spraying [20,21] and micro arc oxidation [22][23][24][25] etc. However, certain problems like non-homogenous structure, micro-structural control problems, micro-cracks formation, the presence of phase impurity, poor adhesion strength were observed in these methods except for MAO technique [26][27][28]. Thus, implant application areas of the coatings produced by these techniques are limited.Micro-arc oxidation (MAO) is one of the most applicable methods to deposit a porous and rough bioceramic layer on valve metals such as Ti, Al, Mg, and Zr surfaces [3,[29][30][31]. The MAO coating promotes bioacti...

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Investigation of WS2-Embedded Al2O3 Coatings Prepared by Microarc Oxidation

Xin

Song

2020

J. of Materi Eng and Perform

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Applying high voltage cathodic pulse with various pulse durations on aluminium via micro-arc oxidation (MAO)

Cited by 28 publications

References 21 publications

Investigation of the High Energy Single Pulses Affect on Micro Arc Oxidation Process on Aluminium

Investigation of the High Energy Single Pulses Affect on Micro Arc Oxidation Process on Aluminium

Characterization, Bioactivity and Antibacterial Properties of Copper-Based TiO2 Bioceramic Coatings Fabricated on Titanium

Investigation of WS2-Embedded Al2O3 Coatings Prepared by Microarc Oxidation

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