基于旋转磁场作用的磁流变脂磁致电阻特性研究  

Study on Magnetoresistance Properties of Magnetorheological Grease Based on Rotating Magnetic Field

作　　者：居本祥 付本元 吕冰[2] JU Benxiang;FU Benyuan;LYU Bing(College of Mechanical Engineering,Chongqing University of Technology,Chongqing 400054,China;School of Automation and Electronic Engineering,Qingdao University of Science and Technology,Qingdao 266044,Shandong,China)

机构地区：[1]重庆理工大学机械工程学院,重庆400054 [2]青岛科技大学自动化与电子工程学院,山东青岛266044

出　　处：《材料导报》2024年第14期18-22,共5页Materials Reports

基　　金：重庆市自然科学基金面上项目(cstc2019jcyj-msxmX0005,cstc2020jcyj-msxmX0425);国家自然科学基金(51905062,61901068);中国博士后科学基金项目(2021MD703913)。

摘　　要：磁流变脂是一种兼具快速磁响应特性和弱流动性的新型磁敏材料,在传感及阻尼减振等领域有着潜在应用价值。本工作利用羰基铁粉作为软磁填充颗粒与脂类基体混合制备了磁流变脂样品,依托所设计的电阻试验单元,并通过自建的旋转磁场试验表征系统,研究了旋转磁场的偏转角度与旋转速度对磁流变脂磁致电阻特性的影响,并在微观层面对影响磁致电阻特性的机理进行了分析。结果表明:增加软磁填充颗粒的含量,可有效提升磁流变脂磁致电阻的相对变化量;在单周期的磁场偏转角度试验中,磁流变脂电阻试验单元的阻值变化形成对称的上升段与下降段,在偏转周期范围内阻值的绝对变化量为2.4 MΩ;试验单元的阻值在不同磁场偏转速度下呈现了与转速相匹配的周期性变化趋势。Mgnetorheological grease is a new magneto-sensitive material with fast magnetic response and weak fluidity,which has potential application value in sensing and damping and vibration reduction.Magnetorheological grease was prepared by using carbonyl iron powder as soft magnetic filling particles and lipid matrix.A resistance test unit and a rotating magnetic field test system were established.The influence of the deflection angle and rotation velocity of the rotating magnetic field on the magnetoresistive properties of magnetorheological grease was studied and the mechanism of the influence on the magnetoresistiveproperties was analyzed at the microscopic level.The results show that the relative variation of magnetoresistance can be effectively improved by increasing the content of soft magnetic filling particles.In the single-period magnetic field deflection angle test,the variation of the resistance of magnetorheological grease resistance test unit formed a symmetrical rising and falling section,and the absolute variation of the resistance value within the range of deflection period was 2.4 MΩ.The resistance value of the test unit showed a periodic variation trend matching the rotating speed at different deflection speeds.

关 键 词：磁流变脂 旋转磁场 羰基铁粉 磁致电阻 

分 类 号：O482.54[一般工业技术—材料科学与工程]