2014
DOI: 10.1590/1516-1439.242713
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Abstract: A discharge of nitrogen-hydrogen mixture by 50 Hz pulsed dc in the presence of active screen cage is investigated by optical emission spectroscopy (OES). The aim is to identify the parameters (mixture ratio, filling pressure and current density) that may lead to high concentration of active species (N 2 , N 2 + and N). The maximum concentration in this experiment is found with 40% H 2 -60% N 2 , at filling pressure of 3 mbar with current density of 5 mAcm -2 . High carbon steel samples are nitrided for 1-4 hou… Show more

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Cited by 8 publications
(3 citation statements)
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References 25 publications
(24 reference statements)
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“…Prior to feeding the gases, the chamber is evacuated down to 10 −2 mbar using a rotary vane pump. The flow of gases is monitored with mass flow meters, whereas pressure in the chamber is recorded by using a capsule-type pressure gauge (25)(26)(27)(28). The experiment is carried out using nitrogen and hydrogen as working gases and argon as a trace gas.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Prior to feeding the gases, the chamber is evacuated down to 10 −2 mbar using a rotary vane pump. The flow of gases is monitored with mass flow meters, whereas pressure in the chamber is recorded by using a capsule-type pressure gauge (25)(26)(27)(28). The experiment is carried out using nitrogen and hydrogen as working gases and argon as a trace gas.…”
Section: Methodsmentioning
confidence: 99%
“…The discharge is sustained with a 50 Hz pulsed dc source. Plasma-induced OES is carried out using simultaneously a computer-controlled system comprising an ocean spectrometer (HR4000 CG-UV-NIR USB 2000) with grating of 300 lines/mm and resolution of a 0.5 nm (FWHM) (27) and a McPherson-2061 monochromator having grating with 1200 grooves/mm and spectral resolution of 0.01 nm coupled with a side window photo-multiplier tube (PMTR928) and auto ranging Pico-ammeter (Keithley-485) The width of the entrance slit, focal length (f) and aperture of the monochromator are 5 μm, 1 m and f/7, respectively (29). The ocean spectrometer is used for the selection of a particular wavelength range and then the selected range is recorded using a McPherson-2061 monochromator.…”
Section: Methodsmentioning
confidence: 99%
“…Nowadays, the improvement of the corrosion-wear resistance of stainless steels is becoming popular research area in the industrial applications. Low temperature nitriding (below 450 °C) is one of the most widely used surface treatment process in order to improve the surface hardness and wear resistance of steels without the loss of corrosion resistance [1,2]. During the nitriding process, so-called expanded austenite can be formed on the surface of the austenitic stainless steels [3].…”
Section: Introductionmentioning
confidence: 99%