Spectroscopic Investigations of Plasma Nitriding and Nitrocarburizing Processes Using an Active Screen: A Comparative Plasma Chemical Study of Two Reactor Types

Hamann, S.; Börner, K.; Burlacov, I.; Spies, H.‐J.; Röpcke, J.

doi:10.1002/ctpp.201510019

Cited by 12 publications

(11 citation statements)

References 24 publications

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“…The plane of the White cell is parallel to the screen and the sample holder (it is rotated by 90° for better illustration) [63], Reproduced from [63], with the permission of AIP Publishing. The ability of PLANIMOR to treat ferrous materials reaching similar nitriding results as in industrial scale ASPN reactors was shown recently [62,63]. A photograph, comparing an untreated steel (C15) sample with a sample treated in PLANIMOR (t = 4 h, P screen = 90 W, T sample = 823 K) using the additional plasma at the sample holder (P sample = 10 W) is shown in Figure 31.…”

Section: Investigations Of Plasma Nitriding and Nitrocarburizing Procmentioning

confidence: 63%

“…The dependencies of the concentration of the carbon containing precursor and of the reaction products on the power of the screen plasma are shown in Figure 32. When comparing the molecular concentrations with those in a cylindrical industrial scale ASPN reactor, it was found that the plasma chemistry in both reactor types is similar [62]. Furthermore, the applied QCLAS led to deeper insights into the chemical processes of this industrial utilized technology.…”

Section: Investigations Of Plasma Nitriding and Nitrocarburizing Procmentioning

confidence: 97%

“…A better knowledge about the fundamental mechanisms inherent in this technology could open up a wider technological potential [62].…”

Section: Investigations Of Plasma Nitriding and Nitrocarburizing Procmentioning

confidence: 99%

“…Although the ASPN technology has proven its industrial applicability in the last decade, the plasma chemical phenomena are far from being completely understood. A better knowledge about the fundamental mechanisms inherent in this technology could open up a wider technological potential [62].…”

Section: Investigations Of Plasma Nitriding and Nitrocarburizing Procmentioning

confidence: 99%

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Applying Quantum Cascade Laser Spectroscopy in Plasma Diagnostics

et al. 2016

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Abstract:The considerably higher power and wider frequency coverage available from quantum cascade lasers (QCLs) in comparison to lead salt diode lasers has led to substantial advances when QCLs are used in pure and applied infrared spectroscopy. Furthermore, they can be used in both pulsed and continuous wave (cw) operation, opening up new possibilities in quantitative time resolved applications in plasmas both in the laboratory and in industry as shown in this article. However, in order to determine absolute concentrations accurately using pulsed QCLs, careful attention has to be paid to features like power saturation phenomena. Hence, we begin with a discussion of the non-linear effects which must be considered when using short or long pulse mode operation. More recently, cw QCLs have been introduced which have the advantage of higher power, better spectral resolution and lower fluctuations in light intensity compared to pulsed devices. They have proved particularly useful in sensing applications in plasmas when very low concentrations have to be monitored. Finally, the use of cw external cavity QCLs (EC-QCLs) for multi species detection is described, using a diagnostics study of a methane/nitrogen plasma as an example. The wide frequency coverage of this type of QCL laser, which is significantly broader than from a distributed feedback QCL (DFB-QCL), is a substantial advantage for multi species detection. Therefore, cw EC-QCLs are state of the art devices and have enormous potential for future plasma diagnostic studies.

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Section: Investigations Of Plasma Nitriding and Nitrocarburizing Procmentioning

confidence: 63%

Section: Investigations Of Plasma Nitriding and Nitrocarburizing Procmentioning

confidence: 97%

“…A better knowledge about the fundamental mechanisms inherent in this technology could open up a wider technological potential [62].…”

Section: Investigations Of Plasma Nitriding and Nitrocarburizing Procmentioning

confidence: 99%

Section: Investigations Of Plasma Nitriding and Nitrocarburizing Procmentioning

confidence: 99%

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Applying Quantum Cascade Laser Spectroscopy in Plasma Diagnostics

et al. 2016

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“…The study of the kinetic in N 2 -CH 4 discharges has been motivated by different domains of application such as plasma nitriding or nitrocarburizing treatment of metallic surface for insulating or hardness properties, detoxification of gazes, chemical synthesis or the study of the chemistry of planetary atmosphere [1][2][3][4][5][6][7][8][9], for several decades. The study of gaseous hydrocarbons or nitriles (organic molecules having the cyano group) produced in cold N 2 -CH 4 discharges or postdischarges is necessary to understand the complex reactive processes involved in discharges, like the lightning in Titan atmosphere, where abiotic evolution is expected and solid aerosols are produced.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of cyanides in N₂–CH₄ discharge afterglow

Jauberteau¹,

Jauberteau²

2018

J. Phys. D: Appl. Phys.

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A microwave discharge (2.45 GHz) is used to study the conversion of methane in a nitrogen afterglow. Investigations are performed both by means of emission spectroscopy and mass spectrometry. We show that methane is injected in the ‘early afterglow’ of the nitrogen discharge where the energy transfer between and is the dominant process producing . Comparing experimental to theoretical results obtained for different vibrational levels v′ of the state at different pressures, we determined the reaction rate constant values corresponding to the energy transfer between and , assuming a Treanor distribution (Tr = 400 K, Tv0–1 = 2500 K) for the vibrational levels of . The reaction rate constant values range from 1.63 × 10−18 m3 s−1 for v′ = 0 to 3.62 × 10−11 cm3 s−1 for v′ = 8. The mean value is equal to 1.93 × 10−17 m3 s−1 when v′ ranges from 0 to 10. The emission intensity decay of the first positive system is studied for bands corresponding to Δv = 3 versus methane concentration. The reaction rate constant value measured for the quenching of by CH4 is close to values proposed in literature in the case of collisions between and CH4. We studied the formation of CN, HCN and C2N2 species in the afterglow, comparing experimental to theoretical results and we measured the reaction rate constant value corresponding to: (1) The production of HCN, by reaction of CH3 with N, k9 = 8.7 × 10−18 m3 s−1. (2) The production of CN, by reaction of CHx<4 with N, γk10 = 1.2 × 10−17 m3 s−1, with γ = . (3) The production of C2N2, we show that it is probably due to the reaction between gaseous and adsorbed cyanogen radicals on the reactor wall. The product of the reaction rate constant by the surface density of CN adsorbed is equal to k14(CNs) = 55 ms−1. (4) The global destruction of CN and C2N2 when CH4 in injected in the afterglow, k11 < 1 × 10−19 m3 s−1 and k15 = 9 × 10−20 m3 s−1, respectively.

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