纳米Fe_3O_4/Fe复合磁流变液的流变性 |
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引用本文: | 程海斌,李立春,官建国,陶剑青,张清杰,袁润章. 纳米Fe_3O_4/Fe复合磁流变液的流变性[J]. 中国粉体技术, 2003, 9(4): 22-25 |
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作者姓名: | 程海斌 李立春 官建国 陶剑青 张清杰 袁润章 |
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作者单位: | 武汉理工大学材料复合新技术国家重点实验室,湖北,武汉,430070 |
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基金项目: | 国家863计划(2001AA339020)、教育部优秀青年教师资助计划和武汉理工大学材料复合新技术国家重点实验室开放基金资助. |
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摘 要: | 用化学共沉淀法合成了纳米Fe3O4粒子,平均二次粒径为51.2nm,比表面积为109.6m2/g。以合成的纳米Fe3O4粒子与羰基铁粉复合配制了纳米复合磁流变(MR)液,并测定了其流变性。结果显示:纳米复合MR液对温度比较稳定;复合MR液在接近零场的低磁场强度下表现为牛顿流体,随着磁场强度提高转变为非牛顿流体;反复加载或撤除磁场,具有"开/关"特性,响应迅速,施加磁场时的响应时间Δt约为50~100ms,撤退磁场时约为100~150ms。
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关 键 词: | 磁流变液 纳米Fe3O4粒子 磁致剪切应力 响应时间 |
文章编号: | 1008-5548(2003)04-0022-04 |
修稿时间: | 2003-06-02 |
Rheological Characteristics of Fe/Fe3O4 Nanocomposite-based Magnetorheological Suspension |
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Abstract: | The Fe3O4 nanoparticles are synthesized with the method of coprecipitation,its average second particle size is about 51.2 nm,its surface area is about 109.6m2/g.A series of magnetorheological (MR) suspension based Fe/Fe3O4 nanocomposites is prepared,and the rheological characteristics are measured.The results show that the MR suspension is not sensitive to temperature and has a characteristics of "on/off" responded to external magnetic field,but responds to external magnetic field a little lower at "switching off" than at "switching on".The MR suspension changed from Newtonian fluids into non Newtonian fluids. |
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Keywords: | magnetorheological fluid Fe_3O_4 nanoparticles shear stress response time |
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