纳米硅酸镁锂对磁流变液性能的影响  

The influence of nanometer lithium magnesium silicate on properties of magnetorheological fluid

作　　者：程海斌[1] 张剑[1] 冯军[1] 官建国[1] 张清杰[1] 瞿伟廉[1] 

机构地区：[1]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

出　　处：《功能材料》2006年第7期1166-1168,共3页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2004AA339020)

摘　　要：以纳米硅酸镁锂、羰基铁粉、硅油等原料制备了一种稳定性好的磁流变液。用振动样品磁强计、扫描电子显微镜、比表面分析仪分别测试了羰基铁粉的磁性能、表面形貌和粒径;用磁流变仪测试了磁流变液的表观粘度和磁致剪切应力;用静置沉降法分析了磁流变液的沉降稳定性。结果表明:纳米硅酸镁锂具有良好的粘度调节功能,用其制备的磁流变液具有触变性,抗沉降性,更大的磁致剪切应力;得出了纳米硅酸镁锂浓度与磁流变液粘度和磁致剪切应力的定量关系。A novel magnetorheological fluid was prepared with nanometer hthium magnesium silicate,carbonyl iron particle,silicon oil and so on. The magnetic properties,appearances and diameters of carbonyl iron particles are characterized by VSM,SEM, ASAP;the apparent viscosities and the magnetic field-induced shear stresses of the magnetorheological fluids above are characterized by an advanced rheometric expansion system,and the deposit stability was analyzed by a stand process. The results show that the nanometer lithium magnesium silicate has a good function of viscosity adjustment, and improved the properties of the magnetorheological fluid based it,including the thixotropy,anti-sediment and enhancement of magnetic field-induced shear stress. The influence of nanometer lithium magnesium silicate on the viscosities and the magnetic field-induced shear stresses can be expressed by the below formula： lgη = 1. 02 ＋ 1. 23wt^ - 0. 6561gγ, lgτy = 0.115 ＋ 0. 192wt%＋1. 914 lgH ＋ 0.07wt% lgH.

关 键 词：磁流变液 触变剂 纳米硅酸镁锂 羰基铁粉 

分 类 号：TF125.8[冶金工程—粉末冶金]