Brake performance of core–shell structured carbonyl iron/silica based magnetorheological suspension

Chemically stable core–shell structured magnetic particles were synthesized by coating soft-magnetic carbonyl iron (CI) microspheres with silica through a sol–gel reaction, and applied as magnetorheological (MR) materials for a specially designed small-sized MR brake. The dynamic yield stress of the...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2014-10, Vol.367, p.69-74
Main Authors: Nguyen, Phuong-Bac, Do, Xuan-Phu, Jeon, Juncheol, Choi, Seung-Bok, Liu, Ying Dan, Choi, Hyoung Jin
Format: Article
Language:English
Subjects:
Brake
Brakes
Carbonyl iron
Carbonyls
Coating
Cross-disciplinary physics: materials science
rheology
Electro- and magnetorheological fluids
Exact sciences and technology
Iron
Magnetorheological
Magnetorheological fluids
Material types
Physics
Rheology
Rheometers
Settling
Silicon dioxide
Torque
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Summary:Chemically stable core–shell structured magnetic particles were synthesized by coating soft-magnetic carbonyl iron (CI) microspheres with silica through a sol–gel reaction, and applied as magnetorheological (MR) materials for a specially designed small-sized MR brake. The dynamic yield stress of the MR suspension containing the synthesized particles was also measured using a rotational rheometer under an applied magnetic field. The performance characteristics of the MR brake, including field dependent torque, hysteresis, time and torque tracking control responses were examined. The results showed that with the exception of the settling time, the other response times were faster than those of the pristine CI based MR fluid. •Silica coated magnetic particle was fabricated as magnetorheological (MR) material.•Small-sized MR brake of disc-type was specially designed.•MR fluid based on silica coated particles exhibited improved tracking accuracy.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2014.04.061