Iran Smell Identification Test

Taherkhani, Safa; Moztarzadeh, Fathollah; Seraj, Jalal Mehdizadeh; Nazari, Seyed Saeed Hashemi; Taherkhani, Farzad; Gharehdaghi, Jaber; Okazi, Arash; Pouraghaei, Sevda

doi:10.1037/t58936-000

Cited by 2 publications

(2 citation statements)

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“…The significant advantages of plasma nitriding over conventional nitriding methods include a reduce in operating coast (gas and energy consumption), and a complete elimination of environmental pollution. Further, controlling the treatment temperature during the process leads to control the formation of nitrided layer with a specific phase composition and less shape distortion with free porous zone [12,13]. As reported in a previous literature, the surface treatment of titanium is better to be performed at low temperature range, up to~950°C in order to reduce the fatigue strength of the treated titanium [14].…”

Section: Introductionmentioning

confidence: 96%

Tribo-mechanical and electrochemical properties of plasma nitriding titanium

El-Hossary

Negm

El-Rahman

et al. 2015

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 96%

Tribo-mechanical and electrochemical properties of plasma nitriding titanium

El-Hossary

Negm

El-Rahman

et al. 2015

Surface and Coatings Technology

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“…The advantageous properties of the ASPN technology for metal treatment have been described in a variety of studies, e.g. in [10][11][12]. Ahangarani and co-workers performed a comparative study of ASPN and CPN on the example of low-alloy steel [13] and used optical emission spectroscopy (OES) data concerning excited atomic and molecular nitrogen from former studies of Cleugh [3] and Zhao et al [2] to explain the positive effects of their treatment.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic studies of conventional and active screen N₂–H₂plasma nitriding processes with admixtures of CH₄or CO₂

Hamann

Börner

Burlacov

et al. 2013

Plasma Sources Sci. Technol.

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Low-pressure pulsed dc H 2 -N 2 plasmas with admixtures of CH 4 or CO 2 used for conventional (CPN) and active screen plasma nitriding (ASPN) were studied by infrared absorption and optical emission spectroscopy (OES) techniques. The experiments were performed in two modes: (i) the plasma at an internal model probe, driven by a bias voltage operated only, representing a CPN approach, and (ii) the screen plasma operated only, which corresponds to an ASPN experiment. Combining in situ tunable diode laser absorption spectroscopy with ex situ Fourier transform infrared spectroscopy the evolution of the concentrations of the methyl radical and of eight stable molecules, C 2 H 2 , CH 4 , C 2 H 4 , CO, CO 2 , NH 3 , HCN and H 2 O was monitored. The degree of dissociation of the carbon-containing precursor molecules varied between 40% and 98%. The methyl radical concentration was found to be in the range 10 11 -10 12 molecules cm −3 . By analysing the development of molecular concentrations with changes in gas mixtures and plasma power values, it was found that (i) C 2 H 2 , HCN and NH 3 were the main products of plasma conversion in the case of methane admixture and (ii) CO, HCN and NH 3 in the carbon dioxide case. The fragmentation efficiencies of methane and carbon dioxide (R F (CH 4 ) ≈ (0.5-4) × 10 16 molecules J −1 , R F (CO 2 ) ≈ (0.5-3.4) × 10 16 molecules J −1 ) and the respective conversion efficiencies to the product molecules (R C (product) ≈10 13 -10 15 molecules J −1 ) were determined for different gas mixtures and plasma power values. With the help of OES the rotational temperature of the screen plasma could be determined, which increased with power from 600 to 850 K. Also with power the ionic component of nitrogen molecules, i.e. the intensity of the N + 2 -(0-0)-band, increased strongly in relation to the intensity of the neutral component, represented by the N 2 -(0-2)-band.

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Iran Smell Identification Test

Cited by 2 publications

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Tribo-mechanical and electrochemical properties of plasma nitriding titanium

Tribo-mechanical and electrochemical properties of plasma nitriding titanium

Spectroscopic studies of conventional and active screen N₂–H₂plasma nitriding processes with admixtures of CH₄or CO₂

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Iran Smell Identification Test

Cited by 2 publications

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Tribo-mechanical and electrochemical properties of plasma nitriding titanium

Tribo-mechanical and electrochemical properties of plasma nitriding titanium

Spectroscopic studies of conventional and active screen N2–H2plasma nitriding processes with admixtures of CH4or CO2

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Spectroscopic studies of conventional and active screen N₂–H₂plasma nitriding processes with admixtures of CH₄or CO₂