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Analyse microstructurale et tribologique de deux types de dépôts en acier inoxydable 18/8 et en molybdène obtenus par projection thermique

Published online by Cambridge University Press:  10 January 2014

M.A. Bradai ,
A. Sadeddine  and
Y. Mouadji
M.A. Bradai
Affiliation:
Laboratoire de mécanique, Matériaux et Energétique, Faculté de technologie, Université de Béjaia, Route de targua Ouzemour, 06000 Béjaia, Algérie. e-mail: mokbrad@yahoo.fr
A. Sadeddine
Affiliation:
Laboratoire de mécanique, Matériaux et Energétique, Faculté de technologie, Université de Béjaia, Route de targua Ouzemour, 06000 Béjaia, Algérie. e-mail: mokbrad@yahoo.fr
Y. Mouadji
Affiliation:
Laboratoire de Mécanique, Département de Génie mécanique, Institut Sciences et Technique, Université de Khenchela, Algérie; e-mail: ymouadji@yahoo.fr
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Abstract

The aim of this work is to produce metallic coatings onto a steel substrate type E335 in order to hardening and improving the tribological properties of contact surfaces. In this study, two different coatings of stainless steel 18/8 and molybdenum realized with and without bond coat in Ni-Al were sprayed using a thermal flame spray technique. The microstructures of the two deposits are obtained using an optical microscope (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Measures microhardness under a load of 200 g, are performed on the polished surfaces of these two types of deposits. The wear and the determination of the coefficients of friction of the two deposits tests were performed in dry conditions. A pin on disc configuration on a tribometer type TE 91 was used with different normal loads and a sliding speed of 0.5 m/s. The results showed that the microstructures obtained by OM and SEM of stainless steel present a dense and compact microstructure. It contains a low porosity and unmelted particles in comparison with the coatings of Mo. In addition, it was found that the spray-coated stainless steel 18/8 exhibited higher microhardness, higher wear resistance and significantly low friction coefficient in comparison with those of Mo coatings.

Keywords

thermal spraycoatingswearfriction coefficientprojection thermiquedépôtsusurecoefficient de frottement
Type
Research Article
Information
Metallurgical Research & Technology , Volume 110 , Issue 6 , 2013 , pp. 405 - 414
Copyright
© EDP Sciences 2014

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