Preparation and characterization of carbonyl iron/strontium hexaferrite magnetorheological fluids  

作　　者：Jianrong Liu Xianjun Wang Xia Tang Ruoyu Hong Yaqiong Wang Wenguo Feng 

机构地区：[1]College of Chemistry,Chemical Engineering and Materials Science &Jiangsu Provincial Key Laboratory of Organic Synthesis,Soochow University [2]School of Chemical Engineering,Fuzhou University [3]Jiangsu Provincial Key Laboratory of Environmental Materials and Engineering,Yangzhou University [4]Suzhou Nanocomp Inc.

出　　处：《Particuology》2015年第5期134-144,共11页颗粒学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(NNSFC,No.21246002);the National Basic Research Program of China(973 Program,No.2009CB219904);National Post-doctoral Science Foundation(No.20090451176);the Jiangsu Provincial Key Lab.of Environmental Materials and Engineering at Yangzhou University(No.K11025);Technology Innovation Foundation of MOST(No.11C26223204581);Natural Science Foundation of Jiangsu Province(No.BK2011328);333 Talent Project(2013) of Jiangsu Province,the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD);Minjiang Scholarship of Fujian Province

摘　　要：The heat transfer oil-based magnetorheological fluid （MRF） was prepared using oleic acid-modified micron carbonyl iron powder as a magnetic dispersed phase and strontium hexaferrite （SrFe12019） nanoparticles as an additive. The sedimentation stability of MRFs was studied. The results indicated that the stability of MRFs was improved remarkably by adding SrFel2019 nanoparticles and the sedimenta- tion ratio was only 0.88 in 20 days when the content of nanoparticles reached 10wt%. The rheological properties were characterized by a HAAKE rheometer without a magnetic field and a capillary rheometer with and without a magnetic field. The effects of SrFe12019 nanoparticles, the temperature, and magnetic field strength were investigated. In addition, the rheological properties could be predicted well using the improved Herschel-Bulkley model, even under a magnetic field. A theoretical model was also proposed to predict the yield stress based on the microstructure of the MRF under an applied magnetic field.The heat transfer oil-based magnetorheological fluid （MRF） was prepared using oleic acid-modified micron carbonyl iron powder as a magnetic dispersed phase and strontium hexaferrite （SrFe12019） nanoparticles as an additive. The sedimentation stability of MRFs was studied. The results indicated that the stability of MRFs was improved remarkably by adding SrFel2019 nanoparticles and the sedimenta- tion ratio was only 0.88 in 20 days when the content of nanoparticles reached 10wt%. The rheological properties were characterized by a HAAKE rheometer without a magnetic field and a capillary rheometer with and without a magnetic field. The effects of SrFe12019 nanoparticles, the temperature, and magnetic field strength were investigated. In addition, the rheological properties could be predicted well using the improved Herschel-Bulkley model, even under a magnetic field. A theoretical model was also proposed to predict the yield stress based on the microstructure of the MRF under an applied magnetic field.

关 键 词：Strontium hexaferrite Magnetorheological fluid STABILITY Rheological property 

分 类 号：TM277[一般工业技术—材料科学与工程] TB381[电气工程—电工理论与新技术]