采用油酸包覆软磁颗粒的方法，分别制备出蓖麻油基含纯微米级和微纳米混合级软磁颗粒的磁流变液。纯微米级软磁颗粒质量含量83％的磁流变液具有沉降稳定性好、屈服应力高等优点，适用于减振和制动领域。纳米级软磁颗粒在微纳米级混合软磁颗粒中的含量越高，相应磁流变液的屈服应力越小，存储模量越低，该种磁流变液适用于密封，能够有效降低动密封过程中所伴随的温升及磨损。
In this paper,the magnetic micron/nano particles were coated by oleic acid to prepare castor oil-based magnetorheological(MR)fluids.MR fluids with mass fraction of pure micrometer carbonyl iron particles 83%show good sedimentary stability and high yield stress.These MR fluids are suit for vibration and brake applica-tions.The yield stress and storage modulus of the MR fluids with micro-nanometer carbonyl iron particles re-duce with the nanometer carbonyl iron particle increasing.And these MR fluids are suit for seal application, which can decrease the temperature rise and wear of the seal devices.
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