Plasma nitriding of Al alloys by DC glow discharge

Moradshahi, M.; Tavakoli, Touraj; Amiri, Saeid; Shayeganmehr, Sh.

doi:10.1016/j.surfcoat.2005.12.002

Cited by 45 publications

(30 citation statements)

References 31 publications

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“…Intensity of AlN increases with increase in time durations at both pressures, which shows that the thickness of the nitride layer increases with time [2]. When the nitriding time increases, the nitrogen content and its density increase to give a continuous AlN layer [18]. The kinetic energy of colliding ions and neutrals can increase the surface diffusion and chemical reaction, improving the surface layer [20].…”

Section: X-ray Diffraction Analysismentioning

confidence: 93%

“…The variation and distribution of these phases can be obtained by comparing the intensities of the Al and AlN diffraction lines for different time and pressure treatment. The peak locations of the AlN phase also change in the nitrided surface layer as a result of nitrogen diffusion [17,18]. Figure 5 shows two peaks of Al and AlN phases at 1 and 2 mbar pressures for different time durations plotted separately with a narrow range of angle in order to show the changes.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

See 1 more Smart Citation

Plasma characterization for nitridation of aluminium alloy using 50 Hz ac discharge

Shah

Ahmad

Zakaullah

et al. 2008

Plasma Devices and Operations

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A 50 Hz ac abnormal glow discharge is characterized as a function of filling pressure (1-4 mbar) using a Langmuir probe. It is found that electron temperature, electron density and electron energy distribution function decrease with the gas filling pressure. Nitriding of aluminum alloy (Al−Mg 2 −Si) is performed for various time durations (3, 6, 9 and 12 h) and pressures (1 and 2 mbar) by keeping the input power (100 W) and substrate temperature (250 • C) constant. To explore the surface properties induced by plasma, X-ray diffractometer, optical micrography, atomic force microscopy and Vickers micro-hardness tester diagnostic techniques are used. Results exhibit the formation of cubic aluminum nitride. A significant increase in surface hardness is observed when samples are exposed at 1 mbar pressure for 12 h of processing time. A rapid decrease in surface hardness values with the imposed load suggests the formation of a thin modified surface layer.

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Section: X-ray Diffraction Analysismentioning

confidence: 93%

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Plasma characterization for nitridation of aluminium alloy using 50 Hz ac discharge

Shah

Ahmad

Zakaullah

et al. 2008

Plasma Devices and Operations

View full text Add to dashboard Cite

show abstract

“…Chemical composition (wt%) of the main alloying elements in the Al 1100 is determined by EDX. The pressure of sample chamber was reduced to 10 −3 Pa by a rotary pump, and then by using a diffusion pump, the chamber evacuated to 10 −5 Pa. Because of the presence of aluminum oxide (Al 2 O 3 ) layer on the surface of every Al alloy that prevents the diffusing of carbon into the substrate, therefore, it is essential to remove the oxide layer by a treatment ioncleaning step called sputtering just before carburizing and to operate at low pressure [7]. Sputtering was performed in argon-hydrogen mixture with the total pressure of 0.12 torr, with the ratio of 30% H 2 and 70% Argon, and substrate temperature of 450…”

Section: Methodsmentioning

confidence: 99%

The Corrosion Behavior of Carburized Aluminum Using DC Plasma

Pirizadhejrandoost

Mahmoudi

Ahmadi

et al. 2012

Journal of Metallurgy

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Because of the outstanding properties of aluminum, it is widely used in today's advanced technological world. However, its insufficient wear resistance limits its use for commercial and industrial applications. In this study, we performed DC diode plasma carburizing of aluminum in the gas composition of CH 4 -H 2 (20-80%) and at a temperature of about 350• C for 4 and 8 hours. The corrosion properties of the untreated and plasma-carburized samples were evaluated using anodic polarization tests in 3 N HCl solution according to ASTM: G5-94. The metallurgical characteristics were then investigated using XRD and SEM. The results showed that the carburizing process improves the corrosion resistance of treated specimens at low temperature.

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“…There have been recent interests in the area of glow discharge plasmas applications, such as etching, semiconductor wafer processing, treatment of fibrous materials and surface modification by deposition of diamond films [1,2]. DC glow discharges in the low-pressure regime have long been used for gas lasers and fluorescent lamps.…”

Section: Introductionmentioning

confidence: 99%

Pressure and Free Flight Time Effects on Glow Discharge Characteristics

Bouanaka¹,

Rebiai²

2013

IJCA

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In this work, a model for a DC glow discharge at low pressure, used in many applications has been developed. This model allows the determination of plasma characteristics distributions in 2D geometry. The proposed theoretical model is applied to collisional argon plasma at low pressure in a reactor consisting of two plane parallel electrodes where the cathode is heated to a voltage of -250 V. The proposed code is based on solving the continuity equation coupled with Poisson's equation and electrons mean energy's equation. The particles trajectories simulation requires the knowledge of all collisional processes through their collision cross sections. The probability of collision during a free flight time can not be known without performing integrations of non-analytical cross sections. The proposed solution to this problem consists in the application of the "null collision" concept. The simulation results are shown in terms of spatial distribution of charged particles, potential, electric field, electrons energy and velocity. The study of the pressure (0.1-1Torr) and the free flight time (5.11x10 -9 to 1.46 x10 -7 s) effect, on the plasma characteristics, confirms the validity of this model

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Plasma nitriding of Al alloys by DC glow discharge

Cited by 45 publications

References 31 publications

Plasma characterization for nitridation of aluminium alloy using 50 Hz ac discharge

Plasma characterization for nitridation of aluminium alloy using 50 Hz ac discharge

The Corrosion Behavior of Carburized Aluminum Using DC Plasma

Pressure and Free Flight Time Effects on Glow Discharge Characteristics

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