In this rsearch, MRFs with different viscosities were prepared. The friction and wear behaviors of carbonyl iron-based MRFs were investigated on a four-ball machine. In addition,, the microscopic changes of surfaces were investigated by using scanning electron microscopy (SEM) to interpret the possible friction and wear mechanisms of MRF.lt is found that the friction reducing and anti-wear properties are improved by increasing the viscosity of base oil and SiO_2 content. Additionally, the operating sequence of sample injection and loading affects the entrainment of iron particles in the sliding surface.
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