Significant Improvement in Magnetorheological Performance by Controlling Micron Interspaces with High Permeability...

Area of Science:

• Materials Science
• Nanotechnology
• Rheology

Background:

• Magnetorheological fluids (MRFs) are essential for vibration damping but achieving balanced performance (shear yield strength, sedimentation stability, zero-field viscosity) is challenging.
• Existing methods like multiscale particle systems show limited improvements and can increase viscosity excessively.

Purpose of the Study:

• To develop advanced MRFs with superior comprehensive performance for vibration damping.
• To synthesize high-performance submicron FeNi particles and create novel bidisperse MRFs using a DC arc plasma method.

Main Methods:

• Synthesis of submicron FeNi particles with high magnetic permeability and low coercivity via DC arc plasma.
• Fabrication of CIPs-FeNi bidisperse MRFs.
• Comprehensive performance analysis, including shear yield strength, sedimentation stability, zero-field viscosity, and redispersibility.
• Mechanism elucidation through analysis of chain-like structures, magnetic flux density, and friction coefficients.

Main Results:

• The synthesized submicron FeNi particles significantly enhanced MRFs' shear yield strength, even under low magnetic fields.
• Improved sedimentation stability and redispersibility were achieved without a substantial increase in zero-field viscosity.
• Optimal content ratios were identified, and performance enhancement mechanisms were detailed.

Conclusions:

• The novel CIPs-FeNi bidisperse MRFs demonstrate superior comprehensive performance for vibration damping applications.
• The straightforward fabrication method enhances the engineering applicability of these advanced MRFs.
• This development advances smart vibration damping technologies.