Effect of Additives on Tribological Performance of Magnetorheological Fluids

Area of Science:

• Materials Science
• Tribology
• Nanotechnology

Background:

• Magnetorheological fluids (MRFs) are crucial for damping and lubrication.
• Improving the tribological performance of MRFs is an ongoing challenge.
• Carbonyl iron (CI) is a common base for MRFs, but its wear properties can be enhanced.

Purpose of the Study:

• To investigate the effect of nano-diamond (ND) and molybdenum disulfide (MoS2) additives on the tribological performance of CI-based MRFs.
• To determine the optimal concentrations of ND and MoS2 for enhanced friction reduction and wear resistance.
• To analyze the wear mechanisms influenced by additives, load, and magnetic fields.

Main Methods:

• Preparation of MRFs with varying wt.% of CI, ND, and MoS2 in silicone oil.
• Tribological testing using a reciprocating friction and wear tester under different normal loads.
• Analysis of friction characteristics, morphological properties (SEM), and elemental composition (EDS) of worn surfaces.

Main Results:

• An appropriate weight percentage of MoS2 additives was found to decrease the friction coefficient and wear scar area.
• Nano-diamond and MoS2 additives influenced the tribological behavior of the MRF.
• SEM and EDS analyses provided insights into the wear mechanisms on the contacting surfaces.

Conclusions:

• Molybdenum disulfide shows potential for reducing friction and wear in CI-based MRFs.
• The wear mechanism in these MRFs is complex, depending on additive type and concentration, applied load, and magnetic field strength.
• Further research into optimizing additive combinations could lead to advanced tribological materials.