磁性液体磁化强度的温度敏感度实验研究  

Experimental study on temperature sensitivity of magnetic fluid magnetization

作　　者：杨文荣[1] 侯立争 张雨蒙 张大磊 YANG Wenrong;HOU Lizheng;ZHANG Yumeng;ZHANG Dalei(State Key Laboratory of Reliability and Intelligence of Electrical Equipment Coconstructed by Province and Ministry,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学省部共建电工装备可靠性与智能化国家重点实验室,天津300130

出　　处：《传感器与微系统》2024年第8期21-24,29,共5页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(51877066)。

摘　　要：通过研究不同种类的磁性液体在高低温下的磁化特性,为磁性液体的工程应用提供磁特性参考。通过实验测量了煤油基磁性液体在190~350 K,水基磁性液体在270~350 K温度区间的磁化强度,定义磁性液体磁化强度的温度敏感度来表示磁化强度随温度的变化率。结果表明:二者的磁化强度均随温度升高线性下降,相同密度下煤油基磁性液体的磁化强度和磁化率均高于水基磁性液体。两种磁性液体的温度敏感度受磁场影响,随着磁场增大呈现先迅速增大后缓慢减小的趋势。煤油基磁性液体和水基磁性液体的温度敏感度的峰值分别是0.074(kA·m^(-1))/K和0.048(kA·m^(-1))/K。整体上,温度敏感度与饱和磁化强度呈正相关,相同密度下煤油基磁性液体的温度敏感度高于水基磁性液体,且煤油基磁性液体的工程应用温度范围更广。By studying magnetization characteristics of different types of magnetic liquids at high and low temperatures,provide a reference of magnetic properties for engineering applications of magnetic liquids.The magnetization strengths of kerosene-based magnetic fluids at 190~350K and water-based magnetic fluids at 270~350 K temperature interval are measured experimentally,and the variation rate of magnetization strength with temperature is expressed by defining the temperature sensitivity of magnetic fluids magnetization.The results show that the magnetization intensity of two decreased linearly with temperature increasing,and both magnetization intensity and magnetization rate of kerosene-based magnetic fluids are higher than those of water-based magnetic fluids at the same density.The temperature sensitivity of both types of magnetic fluids are affected by magnetic field,and show a trend of rapid increase and then slow decrease as the magnetic field increased.The peak values of temperature sensitivity for kerosene-based magnetic fluids and water-based magnetic fluids are 0.074(kA·m^(-1))/K and 0.048(kA·m^(-1))/K,respectively.Overall,the temperature sensitivity is positively correlated with the saturation magnetization strength,and the temperature sensitivity of kerosene-based magnetic liquids is higher than that of water-based magnetic liquids at the same density,and the engineering application temperature range of kerosene-based magnetic liquids is broader.

关 键 词：磁性液体 磁化强度 磁化率 温度敏感度 

分 类 号：TM271[一般工业技术—材料科学与工程]