采用水热法制备钴微米颗粒,通过 X 射线衍射仪、扫描电镜和振动样品磁强计对颗粒的相结构、形貌及磁性能进行表征。结果表明,颗粒为密排六方结构的单质钴,粒径3~5μm,内部呈中空结构,饱和磁化强度为161A·m2/kg。以中空钴微米颗粒为悬浮相,以硅油为基液,制备颗粒体积分数为12%的磁流变液。测试结果表明,基于中空钴微米颗粒的磁流变液的磁致剪切屈服强度在250kA/m 磁场下达到37 kPa,剪切应力的时间稳定性、长期静置的沉降稳定性等均优于同体积浓度的羰基铁粉磁流变液。
Cobalt particles were prepared by hydrothermal method.Their composition,morphology,and mag-netic property were analyzed by X-ray diffractometer,scanning electron microscope and vibrating sample mag-netometer,respectively.The results indicated the composition of the particles was pure cobalt with close-packed hexagonal structure.The particles presented hollow structure with particle size distributed in the range of 3 to 5 micrometers.The saturation magnetization of the particles was 161A·m2/kg,which was close to that of carbonyl iron particle (CIP).Magnetorheological (MR)fluids were prepared with the hollow cobalt particle (HCP),the volume fraction of which was 12%,and silicone oil.Their properties were tested,the results of which indicated that the MR fluids presented a field-induced yield stress of 3 7 kPa.Their shear stress stability with time at constant shear rate,and sedimentation stability during long time standing was better than that of the MR fluids based on carbonyl iron particles with the same volume fraction.
参考文献
| [1] | De Vicente, J.;Klingenberg, D.J.;Hidalgo-Alvarez, R. .Magnetorheological fluids: A review[J].Soft matter,2011(8):3701-3710. |
| [2] | Ginder J M;Davis L C .Shear stresses in magnetorheo-logical fluids-role of magnetic saturation[J].Applied Physics Letters,1994,65:3410-3415. |
| [3] | Dong Xiaomin;Yu Miao;Liao Changrong et al.A new variable stiffness absorber based on magneto-rheological elastomer[J].Transactions of Nonferrous Metals Society of China,2009,19:611-615. |
| [4] | Jang, K.-I.;Min, B.-K.;Seok, J. .A behavior model of a magnetorheological fluid in direct shear mode[J].Journal of Magnetism and Magnetic Materials,2011(10):1324-1329. |
| [5] | Jiang, J.;Tian, Y.;Ren, D.;Meng, Y. .An experimental study on the normal stress of magnetorheological fluids[J].Smart Materials & Structures,2011(8):085012-1-085012-10. |
| [6] | 李金海,关新春,刘敏,欧进萍.斜拉索磁流变液阻尼器半主动振动控制系统的设计与应用[J].功能材料,2006(05):827-830. |
| [7] | 廖昌荣,余淼,陈伟民,黄尚廉.磁流变材料与磁流变阻尼器的潜在工程应用[J].机械工程材料,2001(01):31-34. |
| [8] | Fang Feifei;Liu Yingdan;Choi H J et al.Core-shellstructured carbonyl iron microspheres prepared via dual-step functionality coating and their magnetorheological re-sponse[J].ACS Appl Mater Interfaces,2011,3:3487-3495. |
| [9] | Kim YH;Park BJ;Choi HJ;Seo Y .Coating of magnetic particle with polystyrene and its magnetorheological characterization[J].Physica Status Solidi, A. Applied Research,2007(12):4178-4181. |
| [10] | 熊晨熙,彭向和,易成建.采用油酸和月桂酸改进磁流变液稳定性的实验研究[J].功能材料,2011(08):1504-1507. |
| [11] | Lim ST;Cho MS;Jang IB;Choi HJ .Magnetorheological characterization of carbonyl iron based suspension stabilized by fumed silica[J].Journal of Magnetism and Magnetic Materials,2004(0):170-173. |
| [12] | Sedlacik M;Pavlinek V;Saha P et al.Rheological properties of magnetorheological suspensions based on core-shell structured polyaniline-coated carbonyl iron particles[J].Smart Materials and Structures,2010,19:115008. |
| [13] | Guerrero-Sanchez C;Lara-Ceniceros T;Jimenez-Rega-lade E et al.Magnetorheological fluids based on ionic liquids[J].Advanced Materials,2007,19:1740-1743. |
| [14] | 郭顺鑫 .表面活性剂体系中钴、镍磁性微纳米材料的制备及其性能研究[D].扬州大学,2010. |
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