Kinetics of reactions in   afterglow plasma

Legrand, J.; Diamy, A. M.; Hrach, R.; Hrachová, V.

doi:10.1016/s0042-207x(97)00066-3

Cited by 37 publications

(31 citation statements)

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“…The obtained results about gaseous ion species in the discharge are consistent with published experimental results and chemical models obtained for similar plasmas [26,27,28].…”

Section: Plasma Compositional Analysissupporting

confidence: 90%

“…During the HIPIMS deposition step, high current densities applied in pulses are believed to stimulate several processes inside the active plasma, such as electron impact excitation of metastable N 2 *, excitation of atomic nitrogen and formation of free radicals [26], which are efficient to dissociate methane (CH 4 ) into several gaseous ions of hydrocarbons, and nitrils [26,27,28] in the Ar+N 2 +CH 4 plasma. The high frequency of electron impacts produces stable free carbon ions of C 1+ [28].…”

Section: Plasma Compositional Analysismentioning

confidence: 99%

“…The high frequency of electron impacts produces stable free carbon ions of C 1+ [28]. In HIPIMS the latter process is much more efficient compared to DCMS.…”

Section: Plasma Compositional Analysismentioning

confidence: 99%

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Structure evolution and properties of TiAlCN/VCN coatings deposited by reactive HIPIMS

Hovsepian

Ehiasarian

Petrov

2014

Surface and Coatings Technology

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Abstract:2.5 µm thick TiAlCN/VCN coatings were deposited by a reactive High Power Impulse Magnetron Sputtering (HIPIMS) process. Cross-sectional TEM showed gradual evolution of the structure of the coating with thickness. The initial structure is a nanoscale multilayer with sharp interlayer interfaces. This transforms to nanocomposite of TiAlCN and VCN nanocrystalline grains surrounded by a C-rich tissue phase and finally changes to an amorphous carbon rich Me-C phase. In contrast deposition in similar conditions using standard magnetron sputtering produces a well-defined nanoscale multilayer structure. Depth profiling by AES showed that the carbon content in the HIPIMS coating gradually increased from 25% at the coating substrate interface to 70% at the top thus supporting the TEM observations. Energy-resolved mass spectrometry revealed that HIPIMS plasma is a factor of 10 richer in C 1+ ions, and therefore more reactive, as compared to the plasma generated by standard magnetron discharge at the same conditions. The peculiar structure evolution in HIPIMS is discussed in relation to target poisoning effect and carbon outward diffusion during coating growth. 2Highly abrasive AlSi9Cu1 alloy was dry machined using TiAlCN/VCN coated 25 mm diameter end mills to investigate the coating-work piece material interaction. Green (532nm excitation) and ultraviolet (325 nm excitation) Raman spectroscopy was employed to identify the phase composition of the built up material on the cutting edge and chip (swarf) surfaces produced during machining. These analyses revealed formation of lubricious Magnèli phases namely V 2 O 5 and graphitic carbon as well as highly abrasive SiO 2 and mixed (AlSi)O thus shedding light on the wear processes and coating tribological behaviour during machining.

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“…The obtained results about gaseous ion species in the discharge are consistent with published experimental results and chemical models obtained for similar plasmas [26,27,28].…”

Section: Plasma Compositional Analysissupporting

confidence: 90%

Section: Plasma Compositional Analysismentioning

confidence: 99%

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Structure evolution and properties of TiAlCN/VCN coatings deposited by reactive HIPIMS

Hovsepian

Ehiasarian

Petrov

2014

Surface and Coatings Technology

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“…This characteristic made it suitable for chemical synthesis selection. Methane utilization using glow discharge (Diamy et al 2001;Legrand et al 1997Legrand et al , 1999, dielectric barrier discharge (Kado et al 2004;Zhang et al 2003;Hwang et al 2003, Kim et al 2003a2003b, Jeong et al 2001, Larkin et al 2001, corona (Legrand et al 1997, Liu et al 1997, spark (Legrand et al 1997), arc plasma-jet (Coltrin and Dandy 1993), radio frequency plasma (Savinov et al 2004) and thermal plasma (Fabry et al 2001, Kim 2004) have been investigated already. Other parameters of plasma methane reaction, such as plasma power generator (Yao et al 2001, Song et al 2004a, catalyst process-assisted (Kim et al 2004, water vapor injection (Hijikata et al 1999) were also investigated experimentally.…”

Section: Methane Conversionmentioning

confidence: 99%

“…In some particular cases, the reaction between carbon and radical shows important role, especially in the case when the concentration of acetylene is the highest among other products (Diamy et al 2001). Legrand et al (1997Legrand et al ( , 1999 the investigation have investigated methane conversion using dielectric barrier discharge. Using IR spectroscopy to analyze the excitation of N 2 , they proposed that the reactions were not initiated by electron, but by the existence of excited nitrogen compounds.…”

Section: Methane Conversionmentioning

confidence: 99%

Decomposition of greenhouse gases by plasma

et al. 2008

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The topic of decomposition and reduction of greenhouse gases is becoming an important issue in tackling the global warming effect since several years ago. Several technologies, including plasma-utilized process, were proposed to improve the treatment ability for the destruction of green house gases usually emitted by industrial activities. In this review paper, the application of plasma to reduce the emission of greenhouse gases was briefly summarized.

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Analysis of the products of a negative corona discharge in a N₂–CH₄ mixture with added CO₂ used as a laboratory mimic of a prebiotic atmosphere

Mazánková

Torokova

Moravský

et al. 2018

Contributions to Plasma Physics

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A negative corona discharge operating at atmospheric pressure has been used to initiate chemical reactions in a gaseous mixture of nitrogen, methane, and carbon dioxide. Such a mixture simulates the composition of the early Earth's atmosphere. This work extends our previous experimental studies of the chemistry of prebiotic atmospheres generated in an atmospheric-pressure glow discharge. The present work is devoted to the study of the role of CO 2 in prebiotic atmospheric chemistry. The gas mixture was composed of nitrogen with 2-4% methane and 1% CO 2 . The corona discharge was characterized by electrical measurements and optical emission spectroscopy. The reaction products from the discharge were further analysed by Fourier transform infrared (FTIR) spectroscopy. The composition of solid products deposited on the electrode tip was obtained by energy dispersive X-ray (EDX) analysis. The specific input energy was altered during the experiments, and the concentration of all products was found to increase with its increase. It is further shown that while the addition of the CO 2 admixture leads to the generation of CO and H 2 O, no other compounds containing oxygen were detected. The energy yields of products were calculated, and good agreement was found with the values obtained in previous experiments. KEYWORDSFTIR spectroscopy, negative corona discharge, prebiotic atmosphere 1

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Kinetics of reactions in afterglow plasma

Cited by 37 publications

References 1 publication

Structure evolution and properties of TiAlCN/VCN coatings deposited by reactive HIPIMS

Structure evolution and properties of TiAlCN/VCN coatings deposited by reactive HIPIMS

Decomposition of greenhouse gases by plasma

Analysis of the products of a negative corona discharge in a N₂–CH₄ mixture with added CO₂ used as a laboratory mimic of a prebiotic atmosphere

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Kinetics of reactions in afterglow plasma

Cited by 37 publications

References 1 publication

Structure evolution and properties of TiAlCN/VCN coatings deposited by reactive HIPIMS

Structure evolution and properties of TiAlCN/VCN coatings deposited by reactive HIPIMS

Decomposition of greenhouse gases by plasma

Analysis of the products of a negative corona discharge in a N2–CH4 mixture with added CO2 used as a laboratory mimic of a prebiotic atmosphere

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Product

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Analysis of the products of a negative corona discharge in a N₂–CH₄ mixture with added CO₂ used as a laboratory mimic of a prebiotic atmosphere