Study on the tribological performance of ceramic coatings on titanium alloy surfaces obtained through microarc oxidation

Fei, Chen; Zhou, Hai; Chen, Chen; Yangjian, Xia

doi:10.1016/j.porgcoat.2008.08.034

Cited by 116 publications

(29 citation statements)

References 7 publications

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“…Silicate and silicateÀaluminate solutions are among the most used electrolytes employed to generate ceramic coatings that improve the tribocorrosion behaviour of TiAl alloys. [102,103] Coating effectiveness can be related to the incorporation of silicates in the ceramic coating, either increasing surface hardness or reducing its friction coefficient, [24,104,105] and consequently the adhesion between the component surface and counterpart, thus limiting wear and debris generation. One example of ASD coating produced on mechanical components (planar specimens as well as complex 3D geometries) is shown in Figure 10, where the oxide thickness and morphological features due to spark anodising (microcracks, craters) are highlighted.…”

Section: Corrosion and Wear Resistance For Automotive And Aerospacementioning

confidence: 99%

Application-wise nanostructuring of anodic films on titanium: a review

Diamanti

Ormellese

Pedeferri

2015

Journal of Experimental Nanoscience

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Section: Corrosion and Wear Resistance For Automotive And Aerospacementioning

confidence: 99%

Application-wise nanostructuring of anodic films on titanium: a review

Diamanti

Ormellese

Pedeferri

2015

Journal of Experimental Nanoscience

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“…Nowadays, light metals such as titanium [1][2][3][4], niobium [5][6][7][8][9], tantalum [10][11][12][13][14][15], and their alloys [16][17][18][19][20][21][22], after electrochemical treatment (electropolishing and/or plasma electrolytic oxidation), may be used as biomaterials (implant materials) because of their mechanical properties [23][24][25][26][27], good corrosion resistance [28][29][30][31] in body fluids, and osteointegration [32][33][34]. The electropolishing…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Calcium- and Phosphorus-Enriched Porous Coatings on CP Titanium Grade 2 Fabricated by Plasma Electrolytic Oxidation

Rokosz

Hryniewicz

Gaiaschi

et al. 2017

Metals

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Abstract:In the paper, Scanning Electron Microscopy (SEM), Energy-dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), and Glow Discharge Optical Emission Spectroscopy (GDOES) analyses of calcium-and phosphorus-enriched coatings obtained on commercial purity (CP) Titanium Grade 2 by plasma electrolytic oxidation (PEO), known also as micro arc oxidation (MAO), in electrolytes based on concentrated phosphoric acid with calcium nitrate tetrahydrate, are presented. The preliminary studies were performed in electrolytes containing 10, 300, and 600 g/L of calcium nitrate tetrahydrate, whereas for the main research the solution contained 500 g/L of the same hydrated salt. It was found that non-porous coatings, with very small amounts of calcium and phosphorus in them, were formed in the solution with 10 g/L Ca(NO 3 ) 2 ·4H 2 O, whereas the other coatings, fabricated in the consecutive electrolytes containing from 300 up to 650 g/L Ca(NO 3 ) 2 ·4H 2 O, were porous. Based on the GDOES data, it was also found that the obtained porous PEO coating may be divided into three sub-layers: the first, top, porous layer was the thinnest; the second, semi-porous layer was about 12 times thicker than the first; and the third, transition sub-layer was about 10 times thicker than the first. Based on the recorded XPS spectra, it was possible to state that the top 10-nm layer of porous PEO coatings included chemical compounds containing titanium (Ti 4+ ), calcium (Ca 2+ ), as well as phosphorus and oxygen (PO 4 3− and/or HPO 4 2− and/or H 2 PO 4 − , and/or P 2 O 7 4− ).

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“…To prepare the nano-layers with expected chemical composition and mechanical properties, the electropolishing (EP) [1], magnetoelectropolishing (MEP) [2], and high-current density electropolishing (HDEP) [3] processes are employed, while for obtaining the micro scale layers, the Plasma Electrolytic Oxidation (PEO), known also as Micro Arc Oxidation (MAO) [4][5][6], should be used. That method may be used to oxidize inter alia the titanium [7][8][9][10], its alloys (Ti6Al4V [11][12], Ti6Al7Nb [13], NiTi [14], TiNbZr [15], TiNbZrSn [16]) as well as niobium [18] and tantalum [19]. In addition, it has to be pointed that PEO coatings may be enriched also in other elements, i.e.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterisation of porous, calcium enriched coatings on titanium after plasma electrolytic oxidation under DC regime

Rokosz

Hryniewicz

Pietrzak

et al. 2017

Advances in Materials Science

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The purpose of this work is to produce and characterize (chemical composition and roughness parameters) porous coatings enriched in calcium and phosphorus on the titanium (CP Titanium Grade 2) by plasma electrolytic oxidation. As an electrolyte, a mixture of phosphoric acid H 3 PO 4 and calcium nitrate Ca(NO 3 ) 2 ·4H 2 O was used. Based on obtained EDS and roughness results of PEO coatings, the effect of PEO voltages on the chemical composition and surface roughness of porous coatings was determined. With voltage increasing from 450 V to 650 V, the calcium in PEO coatings obtained in freshly prepared electrolyte was also found to increase. In addition, the Ca/P ratio increased linearly with voltage increasing according to the formula Ca/P = 0.035·U+0.176 (by wt%) and Ca/P = 0.03·U+0.13 (by at%). It was also noticed that the surface roughness increases with the voltage increasing, what is related to the change in coating porosity, i.e. the higher is the surface roughness, the bigger are pores sizes obtained.

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Study on the tribological performance of ceramic coatings on titanium alloy surfaces obtained through microarc oxidation

Cited by 116 publications

References 7 publications

Application-wise nanostructuring of anodic films on titanium: a review

Application-wise nanostructuring of anodic films on titanium: a review

Characterisation of Calcium- and Phosphorus-Enriched Porous Coatings on CP Titanium Grade 2 Fabricated by Plasma Electrolytic Oxidation

Fabrication and characterisation of porous, calcium enriched coatings on titanium after plasma electrolytic oxidation under DC regime

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