Results 311 to 320 of about 15,310 (342)

Plasma Nitriding Potential and a New Modeling Approach for Plasma Nitriding Process Control

Heat Treating Conference, 2015
Abstract Plasma nitriding is a thermochemical surface heat treatment of steel components to produce nitride layers which increase wear-, corrosion- and fatigue resistance. Research into plasma nitriding lately showed that there is a significant and characteristic amount of ammonia formed off the process gases nitrogen and hydrogen.
Marian Georg Skalecki, Heinrich Klümper-Westkamp, Franz Hoffmann, Hans-Werner Zoch, Sebastian Bischoff, Jörn Rohde   +5 more
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Active Screen Plasma Nitriding

2016
Conventional plasma nitriding has some limitations and disadvantages such as edge effect, hollow-cathode effect (The hollow-cathode effect usually seen in industry resulted by incorrect fixturing. This problem arises from insufficient distance between the parts to be nitrided.
Hossein Aghajani, Sahand Behrangi
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Conventional DC Plasma Nitriding

2016
As known before, the usual source for generating the plasma in plasma nitriding system is DC current (conventional or pulsed). This chapter just includes the results obtained by conventional DC plasma nitriding system on different grades of steels including stainless steels (austenitic, martensitic or precipitation hardening types), tool steels, and ...
Hossein Aghajani, Sahand Behrangi
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Carbon nitride film deposition by active screen plasma nitriding

Materials Letters, 2011
Abstract Deposition of CN-based films by a novel version of active screen plasma nitriding, aiming at surface modification of polymers, is reported. The approach relies on the use of pure graphite as the grid material, which was found to act both as an active screen and as a dry source of carbon atoms for the synthesis of thin films consisting mainly
Ângela E. Crespi, Marcelo E.H. Maia da Costa, Carlos A. Figueroa, Marta E.R. Dotto, Alan P. Kauling, Gabriel V. Soares, Israel J.R. Baumvol, Cristiano Giacomelli   +7 more
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Initial nitride formation during plasma-nitridation of cobalt surfaces

Applied Physics Letters, 2016
Nitridation of metal surfaces is of central importance in microelectronics and spintronics due to the excellent mechanical, thermal, and electrical properties of refractory nitrides. Here, we examine the chemical and structural modification of cobalt surfaces upon nitrogen plasma treatment, using in situ spectroscopic methods, as a method for synthesis
E. C. Mattson, D. J. Michalak, W. Cabrera, J. F. Veyan, Y. J. Chabal   +4 more
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Plasma nitriding of Inconel 625

Surface Technology, 1979
Abstract Inconel 625 was nitrided in an N 2 + H 2 d.c. glow discharge, with the samples of Inconel being bombarded at a high temperature of about 500 °C and a high gas pressure of 3 Torr. Treatment for 10 h under these conditions enhanced the hardness by a factor of about 4.5 compared with the untreated alloy.
A.S. Rizk, D.J. McCulloch
openaire   +1 more source

Formation of aluminum nitride by intensified plasma ion nitriding

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, 1991
Ion nitriding of pure Al with an intensified glow discharge was attempted in the present work. The results showed that formation of aluminum nitride is feasible under low pressure, enhanced plasma conditions. The nitride formed had a dense structure and an ultrafine nuclei size (less than 100 Å).
E. I. Meletis, S. Yan
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Recent progress in plasma nitriding

Vacuum, 2000
Abstract The paper reports on a new system for plasma nitriding combined with a hollow cathode discharge sputtering at high pressures (about 1000 Pa), a new way of producing duplex coatings, and on a low-pressure (0.1–0.3 Pa) plasma nitriding using microwave discharges.
J Musil, J Vlček, M Růžička
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On plasma nitriding of steels

Surface and Coatings Technology, 2000
Abstract With the aim of optimizing the nitriding process, experimental studies of the plasma nitriding of four selected steels were carried out, using a d.c. glow discharge. The process parameters were varied systematically. By means of transmission and scanning electron microscopy and X-ray diffraction, the microstructures, including the ...
Berg, M., Budtz-Jørgensen, C.V., Reitz, H., Schweitz, K.O., Chevallier, J., Kringhøj, P., Bøttiger, J.   +6 more
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Radiofrequency (RF) Plasma Nitriding

2016
The usual plasma nitriding is done using glow discharge with the workpiece as cathode at pressures between 100 and 1000 Pa. This procedure leads to bombardment of the surface by energetic ions, therefore the temperature is high.
Hossein Aghajani, Sahand Behrangi
openaire   +1 more source