The Effect of Lubricant on Tribological Properties of Carbonyl Iron-Based Magnetorheological Fluids

Abstract

Magnetorheological fluid (MRF) is a new kind of smart material, it is very necessary for us to study its tribological properties because it will be widely used in engineering application. In this paper, the tribological behavior of Carbonyl Iron-based magnetorheological fluid (MRF) was investigated on a four-ball tribological tester, the influence of lubricant on friction coefficient and wear scar diameter was discussed, the morphology of the wear steel surfaces lubricated with MRF were observed by a scanning electron microscope. The results show that the addition of MoS2can significantly improve the tribological properties of clay-based MRF. However, the friction and wear properties of silica-based MRF become bad after the addition of MoS2. The morphology of worn surface lubricated with the MRF added MoS2is similar to that without additive, but the groove of wear marks lubricated with clay-based MRF is more shallower and the area of the worn surface is smaller in the condition of adding MoS2.

Effects of micron-sized iron particles on friction and wear behaviors of seals used in a magnetorheological damper: analysis and experiment

“…where, λ y and E r is the radial stretch deformation and material elasticity modulus of the sliding ring, respectively. Substituting equation (11) in equation (10), the ultimate contact pressure, ∂, can be expressed based on the formula of…”

“…A unique method to test the wear of rod seals in MRD was developed in [9], but the friction resistance was not thoroughly measured and analyzed. Wear characteristics of MR fluid under boundary lubrication and magnetic field activation were investigated in [10][11][12] and modified MR fluids with different additives were experimentally introduced to improve tribological performances [13]. The influence of initial surface roughness on the tribological characteristics of MR fluids has been studied in [14], and tribological characteristics of MR fluids with additives have been evaluated using both the pin-on-disk tester and linear-oscillation tester where the magnetic field intensity in the operation mode is different [15].…”