Abstract
The paper presents the results of theoretical and experimental studies of the magnetic properties of magnetic lubricating oils. It shows oil magnetization curves in the initial state and after tests in the boundary friction mode. Oil properties were measured by an original magnetometer with Hall sensors. It has been established that triboeffects change oil composition and structure and decrease its magnetization. The results will help determine the optimal operating conditions of magnetic oils while maintaining their magnetic and lubricating properties.
Highlights
Magnetic lubricating oils that are used in friction units of modern high technology equipment increase their life, energy performance and improve their friction characteristics [1,2,3,4,5]
The analysis of magnetic oil magnetization curves, which are taken during simulation of real tribological effects, will help evaluating the possibility of using magnetic oils in various friction units quickly and efficiently, as well as improving their functional properties purposefully
The paper shows that tribological effects on magnetic oil cause its magnetization decrease due to the oxidation of magnetic dispersed particles and separation of the dispersion medium in oils with low colloidal stability
Summary
Magnetic lubricating oils that are used in friction units of modern high technology equipment increase their life, energy performance and improve their friction characteristics [1,2,3,4,5]. The range of tribounits with magnetic oils as a lubricant and a working fluid is wide: sliding bearings, guides, sealants, magnetic couplings, etc. Pressure, and shear stresses in the friction zone that affect magnetic oils during operation lead to changing their chemical composition as a result of molecular destruction, chemical interaction of molecules with the surface and atmospheric gas, loss of magnetic properties by magnetic particles, and violation of oil colloidal stability [ 8, 9]. After studying switching curves of magnetic oils, we can obtain the information that will become a basis for tracing the dynamics of changes in the content of magnetic and nonmagnetic phases in a carrier fluid, estimating the effective particle size of a dispersed phase, investigating oil colloidal stability, and determining the main magnetic characteristics necessary to design friction units with magnetic oils. The analysis of magnetic oil magnetization curves, which are taken during simulation of real tribological effects, will help evaluating the possibility of using magnetic oils in various friction units quickly and efficiently, as well as improving their functional properties purposefully
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