期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 529, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2021.167910
关键词
Magnetorheological fluid; Silicone oil; Carbonyl iron particles; Sedimentation; Fumed silica; Herschel-Bulkley model
资金
- IMPRINT India
- Ministry of Road Transport and Highways, Govt. of India [IMPRINT/2016/7330]
- Ministry of Human Resources Development
This study investigated the influence of different types of fumed silica mixed in silicone oil on the performance of carbonyl particles based magnetorheological fluids. The results showed that hydrophilic silica with larger surface area had a significant impact on the fluid characteristics, exhibiting higher dynamic yield stress and improved sedimentation ratio.
The present work reports the influence of different types of surface area, hydrophobic, and hydrophilic fumed silica mixed in silicone oil as a thixotropic additive on carbonyl particles based magnetorheological fluids (MRFs) were prepared. Scanning electron microscopy analysis confirms the fumed silica particles attached to the surfaces of CIPs. The vibrating sample magnetometer result shows the MRF4 and 5 have a better magnetic saturation value of 30.12 emu/gm and 40.12 emu/gm, respectively. The experimental rheological flow curve behaviours are investigated using the magnetorheometer. The Herschel-Bulkley rheological model is found to be in good agreement with the experimental curves and suggested shear thinning property is observed. The results showed that the hydrophilic silica with larger surface area type presented (i.e.MRF 4 and 5) better magnetorheological fluid characteristics in terms of shear stress, with a high value of dynamic yield stress, and have much-improved sedimentation ratio up to seven days.
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