Abstract
The present work discusses the friction and wear of polyamide sliding against steel in the presence of magnetic field. Tests were carried out at dry and oil lubricated steel surfaces. Paraffin and vegetable oils such as almond, castor, corn, glycerine, jasmine, olive and sun flower oils were used as lubricants. The friction coefficient and wear were investigated using pin on disc wear tester. Based on the experimental results, it was found that application of magnetic field on the contact area affected both friction coefficient and wear of polyamide sliding against steel at dry and oil lubricated conditions. Magnetic field decreased friction coefficient. Lubricating the sliding surface by paraffin oil as well as almond, castor, corn, glycerine, jasmine, olive and sun flower oils significantly decreased friction coefficient. Generally, friction coefficient increased with increasing applied load. Dry sliding of polyamide against steel surface showed increased wear with increasing load. The lowest wear values at no magnetic field were displayed by jasmine oil followed by sun flower, almond, olive, castor, corn, glycerine and paraffin oils. Under the application of magnetic field, the lowest wear values were displayed by sun flower oil followed by jasmine, castor, glycerine, olive, paraffin, almond and corn oils. It can be concluded that friction and wear decrease observed at dry sliding can be explained on the basis that presence of magnetic field around the contact area decreased the adherence and transfer of polyamide into the steel surface. For oil lubricated sliding, the polar molecules of the tested lubricating oils were much affected by the magnetic field, where they oriented themselves to the polar end directed towards the sliding surface making a close packed multi-molecular layered surface film that could protect the sliding surfaces from excessive wear.
Highlights
In electronic appliances, the mechanical drives perform under the effect of magnetic field
Presence of magnetic field decreased the friction coefficient relative to the condition without magnetic field. It seems that the magnetic field reduced the possibility of polyamide worn particles to adhere into the steel surface, so that friction coefficient decreased
Dry sliding of polyamide against steel surface showed increased wear with increasing load, Figure 12
Summary
The mechanical drives perform under the effect of magnetic field. The conventional lubrication mechanisms based on physical and chemical adsorption, where the polar molecules play a key role in interactions with the sliding surfaces, the best tribological performance is expected for vegetable oils, which consist of a considerable amount of fatty acids with unsaturated bonds [27]. It was observed that wear resistance of lubricated surfaces can be significantly improved by the formation of a stable tribochemical film [29] This film can be applied on the sliding surfaces through the polar action of vegetable oil. The effect of magnetic field is on the friction and wear of polyamide sliding which is against steel counterface under dry and lubricated working conditions. Parrfain and vegetable oils such as corn, sun flower, glycerine, olive, jasmine, almond and castor oils were used as lubricant
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