Magnetic Nanodispersed Lubricants Based on Organosilicon Liquids

Resumo

For the first time, the generalized results of complex experimental studies aimed at the development functional nanodispersed liquid lubricants with anomalously high magnetic properties are reported. Appropriateness is substantiated for the use of a dispersion medium based on organosilicon liquids in the production of magnetic lubricating oils of a new generation. Information necessary for choosing the dispersed magnetic phase is presented. An original approach to the fitting of surface-active substances intended to stabilize the colloidal structure of magnetic oils, taking into account their dielectric properties and the features of the effect exerted on friction, has been demonstrated. Recommendations are given concerning a preliminary choice of prospective additives and fillers for magnetic oil, and the efficiency of the action of additives under different operating conditions of friction units with magnetic oil is established. Technological features are described for the synthesis of lubricants based on polyethylenesiloxane PES-5 and chlorophenylsiloxane KhS-2-1VV containing nanosized magnetite. The lubricating properties of magnetic oils based on oligodiethylsiloxane and oligomethyl(chlorophenyl)siloxane under various friction conditions have been investigated and their specific features have been demonstrated. The effect of various additives and fillers exerted on the tribotechnical characteristics of magnetic oils is analyzed in detail. A different mechanism of the effect exerted by additives on the properties friction contacts lubricated with magnetic oil is revealed and described. According to the testing results for the magnetic oils, lubricant compositions most promising for practical use in friction assemblies have been determined. It has been established that the service lifetime of the new magnetic oil is comparable with transmission gear oils, for example, TM-5-18, and two or three orders of magnitude greater than that inherent in plastic lubricants.