A NOVEL METHOD FOR IMPROVING PLASMA NITRIDING EFFICIENCY: PRE-MAGNETIZATION BY DC MAGNETIC FIELD

Halim Kovaci, Ali Fatih Yetim (), Yusuf Burak Bozkurt () and Ayhan Çelik ()
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Halim Kovaci: Department of Mechanical Engineering, Faculty of Engineering, Atatürk University, 25240 Erzurum, Turkey
Ali Fatih Yetim: #x2020;Department of Mechanical Engineering, Faculty of Engineering and Architecture, Erzurum Technical University, 25240 Erzurum, Turkey
Yusuf Burak Bozkurt: Department of Mechanical Engineering, Faculty of Engineering, Atatürk University, 25240 Erzurum, Turkey
Ayhan Çelik: Department of Mechanical Engineering, Faculty of Engineering, Atatürk University, 25240 Erzurum, Turkey

Surface Review and Letters (SRL), 2017, vol. 24, issue 01, 1-6

Abstract: In this study, a novel pre-magnetization process, which enables easy diffusion of nitrogen, was used to enhance plasma nitriding efficiency. Firstly, magnetic fields with intensities of 1500G and 2500G were applied to the untreated samples before nitriding. After the pre-magnetization, the untreated and pre-magnetized samples were plasma nitrided for 4h in a gas mixture of 50% N2–50% H2 at 500∘C and 600∘C. The structural, mechanical and morphological properties of samples were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness tester and surface tension meter. It was observed that pre-magnetization increased the surface energy of the samples. Therefore, both compound and diffusion layer thicknesses increased with pre-magnetization process before nitriding treatment. As modified layer thickness increased, higher surface hardness values were obtained.

Keywords: Plasma nitriding; magnetic field; magnetization; pre-magnetization; ferromagnetic material (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500056

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