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 190～350 K 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
Key words
magnetic fluid/magnetization/susceptibility/temperature sensitivity
万方数据