Spectral analysis of an electrolytic plasma in the process of synthesis of aluminum oxide

Klapkiv, М. D.; Nykyforchyn, H. М.; Posuvailo, V. M.

doi:10.1007/bf00569685

Cited by 100 publications

(58 citation statements)

References 4 publications

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“…This precision was confirmed by the observed separation of close oxygen 3F-3D lines with different total angular momentum, 794.7168 nm and 794.7548 nm. Since only a very small contribution is expected from Doppler broadening at T-0.3 eV, this suggests that the electron density in the peripheral regions is N e~1 0 15 cm − 3 , using published tables [26] and analysis [5,28] of the micro discharges. Based on the value of the absorption coefficient for water, as a function of wavelength [29], it can be estimated that the effect on the Balmer line intensity ratio of passage Fig.…”

Section: Optical Emission Spectramentioning

confidence: 93%

“…This is indeed a low plasma temperature. The intensity of the recombination continuum at high photon energies ω (low wavelengths) is [5] proportional to…”

Section: Optical Emission Spectramentioning

confidence: 99%

“…The first investigation of this type was carried out in 1994 by Klapkiv et al [5], concerning discharges during PEO processing of Al. A further study on Al was carried out in 2005 by Mécuson et al [6], while Arrabal et al [7] recently studied a Mg alloy in this way.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of discharge events during plasma electrolytic oxidation

Dunleavy

Golosnoy

Curran

et al. 2009

Surface and Coatings Technology

326

169

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A study has been made of the electrical characteristics and optical emission spectra exhibited when discharge events take place during plasma electrolytic oxidation processing. Both conventional and small area experimental arrangements have been employed, allowing detailed measurement of durations, and temporal distributions, as well as such characteristics as charge transfer, and power. Individual discharges are of short duration, typically tens to hundreds of microseconds, but there is a strong tendency for them to occur in cascades that commonly last between several ms and several tens of ms. The composition, temperature and electron density of the plasma formed during PEO processing are inferred from characteristics of the emission spectra. This confirms that there are two distinct regions of plasma; a lower density peripheral region at~3500 K, and a higher density core at 16,000 ± 3500 K. The implications of these results are considered in terms of the interpretation of different types of experimental measurement, and attention is also briefly given to how such behaviour might relate to the mechanisms of growth.

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Section: Optical Emission Spectramentioning

confidence: 93%

“…This is indeed a low plasma temperature. The intensity of the recombination continuum at high photon energies ω (low wavelengths) is [5] proportional to…”

Section: Optical Emission Spectramentioning

confidence: 99%

See 1 more Smart Citation

Characterisation of discharge events during plasma electrolytic oxidation

Dunleavy

Golosnoy

Curran

et al. 2009

Surface and Coatings Technology

326

169

View full text Add to dashboard Cite

show abstract

“…It was found previously that in the discharge channel there were 4 regions that differed in both temperature and composition [12][13][14][15][16]. The temperature in the central zone of the discharge channel is 7.000 -10.000 K and decreases to 600 K in the adjacent areas.…”

Section: Resultsmentioning

confidence: 83%

Gibbs energy calculation of electrolytic plasma channel with inclusions of copper and copper oxide with Al-base

Posuvailo

Klapkiv

Студент

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…It has been widely used by active companies, such as Keronite (UK), Magoxid-Coat (Germany), and Microplasmic (USA), active in commercial development of PEO technology [23]. Primarily used for pure aluminum or alloyed [23][24][25][26][27][28][29][30] aluminum treatments, PEO was applied recently for the oxidation of magnesium and its alloys [29][30][31][32][33] and titanium and its alloys [34][35][36][37][38][39][40][41][42][43][44] as well as niobium [45][46][47], zirconium [48][49][50][51], and tantalum [52][53][54][55]. In recent years, titanium and its alloys used as biomaterials drew the attention of numerous teams of researchers in the world.…”

Section: Introductionmentioning

confidence: 99%

Development of copper-enriched porous coatings on ternary Ti-Nb-Zr alloy by plasma electrolytic oxidation

Rokosz

Hryniewicz

Raaen

et al. 2016

Int J Adv Manuf Technol

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In this paper, a preparation method and characteristics of porous coatings enriched in copper distributed in the whole volume on a ternary Ti-Nb-Zr alloy biomaterial obtained by plasma electrolytic oxidation (PEO) in an electrolyte containing H 3 PO 4 within Cu(NO 3 ) 2 at potentials of 180 and 450 V are presented. It has been shown that the PEO potential has impact on the thickness of the coatings, i.e., the higher the potential used, the thicker the coating obtained. Using XPS study, it was shown that copper inside the coating appears as Cu + and Cu 2+ ions, while titanium, niobium, and zirconium appear as Ti 4+ , Nb 5+ , and Zr x+ (x ≤ 2), respectively. It was also found that the roughness of PEO coating formed at 450 V is higher than the one obtained at 180 V, and it is well correlated with bigger pores after the PEO treatment. Additionally, in this paper two PEO coating models composed of three sub-layers are presented. The thickness of the outer top porous sub-layer obtained after PEO oxidation at both 180 and 450 V equals to about 2 μm, while the semi-porous as well as transition sub-layers are thicker after PEO processing at 450 V (5 μm) than those obtained at 180 V (4 μm thick). The creation of the top porous and transition compact sub-layer of PEO coating may be explained by switch-on and switch-off of the PEO potential, while the middle and semi-porous sub-layers are most likely formed during the stable voltage conditions of PEO treatment.

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Spectral analysis of an electrolytic plasma in the process of synthesis of aluminum oxide

Cited by 100 publications

References 4 publications

Characterisation of discharge events during plasma electrolytic oxidation

Characterisation of discharge events during plasma electrolytic oxidation

Gibbs energy calculation of electrolytic plasma channel with inclusions of copper and copper oxide with Al-base

Development of copper-enriched porous coatings on ternary Ti-Nb-Zr alloy by plasma electrolytic oxidation

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