Comparative Study of an Alternative Magnetic Field on the Tribological Behaviour of Ferromagnetic/Ferromagnetic and Non-Ferromagnetic/Ferromagnetic Couples

Mekroud, A.; Bouchoucha, A.; Zaidi, H.
March 2010
International Review of Mechanical Engineering;Mar2010, Vol. 4 Issue 3, p228
Academic Journal
The thermomechanical behaviour and the characterization of two material couples ferromagnetic/ferromagnetic and non ferromagnetic/ferromagnetic in a sliding contact subjected to an alternative magnetic field were studied. By using a tribometer pin-disc, the tests in the dry friction and wear were carried out (steel XC48/steel XC48 and aluminium/steel XC 48) according to the intensity of the magnetic field under various normal loads for a constant relative sliding speed. The presence of the magnetic field around the tribocontact, steel against steel, modifies its tribological behaviour. It leads to a stabilization of friction and a significant reduction in the wear rate. For the material couple, aluminium/steel, one also attends a stabilization of friction, but wear is relatively higher in comparison with the first couple. These tribological differences in behaviour result from the modification of the nature of the contact by the magnetic field. To compare these differences, we analyzed the influence of three principal parameters: the oxidation of surfaces of contact by the magnetic field, the role of the third body, the structural modifications of surfaces of materials in contact. The oxidation of surfaces, due to the presence of the magnetic field, is determinited by the parameter in these results. This phenomenon is favoured particularly by the rate of oxidation which depends on the temperature reached at the interface. Moreover, many factors are to be taken into account in the comprehension of this phenomenon especially the physico-chemical reactivity of surfaces of magnetized ferromagnetic steel contact, the increase in the temperature of metal by the Foucault currents, etc. The oxide film thus formed and the active particles of wear thus reduce the force of shearing at the interface. They play a protective role in the slipping dry contact and modify the mode of wear from severe to the light one. The characterization of worn material is demonstrated by the hardening of the surface of contact and the modification of the crystalline texture of material under the effect of the magnetic field and the surface embrittlement. The discussion of the results obtained is based essentially on observations with scanning electron microscope (S.E.M) of the used faces, analysis by X-ray diffraction (8-28) (XRD) of the particles wear.


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