| Rheological properties of magnetorheological fluid prepared by gelatin-carbonyl iron composite particles |
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| 摘 要： | Gelatin — carbonyl iron composite particle was prepared by micro emulsion method. The analysis of scanning electron microscope(SEM)
shows that the ultrafine particles are spheroids coated by gelatin, and the average sizes of particles are 3 – 10 μm. The
specific saturation magnetization σs is 130.9 A · m2/kg, coercivity H
c is 0.823 A/m, and residual magnetism r is 4.98 Am2/kg for the composite particles. It is shown that the particles possess properties of soft magnetic. The yield stress of magnetorheological
fluid (MRF) with composite particle reaches 70 kPa at 0.5 T magnetic induction. Magnetorheological effects are superior in
lower magnetic field intensity and the subsidence stability of the MRF is excellent compared with pure carbonyl iron powder.
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| 关 键 词： | 凝胶 铁 复合体 流变学 流动性 磁性材料 粉末冶金 |
| 文章编号： | 1005-9784（2005）04-0411-05 |
| 收稿时间： | 2004-10-20 |
| 修稿时间： | 2004-12-15 |
Rheological properties of magnetorheological fluid prepared by gelatin — carbonyl iron composite particles |
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| Authors: | Pan Hua-jin Huang Hong-jun Zhang Ling-zhen Qi Jian-ying and Cao Shao-kun |
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| Affiliation: | (1) Section of Physics and Chemistry, Shijiazhuang Mechanical Engineering College, 050003 Shijiazhuang, China |
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| Abstract: | Gelatin-carbonyl iron composite particle was prepared by micro emulsion method. The analysis of scanning electron microscope(SEM) shows that the ultrafine particles are spheroids coated by gelatin, and the average sizes of particles are 3-10 μm. The specific saturation magnetization σs is 130.9 A·m2/kg, coercivity Hc is 0.823 A/m, and residual magnetism r is 4.98 Am2/kg for the composite particles. It is shown that the particles possess properties of soft magnetic. The yield stress of magnetorheological fluid(MRF) with composite particle reaches 70 kPa at 0.5 T magnetic induction. Magnetorheological effects are superior in lower magnetic field intensity and the subsidence stability of the MRF is excellent compared with pure carbonyl iron powder. |
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| Keywords: | micro emulsion composite particle gelatin carbonyl iron yield stress |
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