Titel Effect of Magnetic Field on the Performance of Lubricant Additives
Autor G. T. Abdel-Jaber, M. K. Mohamed, A. S. Al-Osaimy, W.Y. Ali
Infos zum Autor Abdel-Jaber G. T.*, Mohamed M. K.**, Al-Osaimy A. S.*** and Ali W. Y.***

*Qena Faculty of Engineering, South Valley University, Qena, EGYPT.
**Faculty of Engineering, Minia University, P. N. 61111, El-Minia, EGYPT.
***Faculty of Engineering, Taif University, Saudi Arabia.
Inhalt Abstract
The present work investigates the effect of magnetic field on the friction coefficient displayed by sliding surfaces lubricated by paraffin oil and dispersed by different lubricants additives such as zinc dialkyldithiophosphates (ZDDP), molybdenum disulphide (MoS2), heteropolar organic based additive (CMOC), graphite (C), detergent additive (calcium sulphonate) (DA), polytetrafluroethylene (PTFE) and polymethyl methacrylate (PMMA). The experiments showed that, for steel surfaces lubricated by oil, friction coefficient increased as the magnetic field increased due to the increase of the normal load caused by the magnetic force. The charged surfaces can interact with each other due to the direct electrostatic forces. Since magnetic forces are strong and effective, they contribute a major part of the adhesion force. Dispersing oil by ZDDP additive caused significant friction decrease. The performance of ZDDP additive was not affected by the application of magnetic field. The magnetic field decreased friction coefficient when the oil was dispersed by CMOC by means of increasing the adherence of CMOC particles into the sliding surfaces due their electronic properties. Besides, it was observed that magnetic field much affected the performance of oil dispersed by additives of electrical properties such as CMOC, DA and, C. PTFE particles dispersed in the oil were much influenced by the magnetic field, where the lowest value was displayed at the highest intensity. The same trend of friction decrease was observed for PMMA particles dispersed in oil.
Datum 2011