磁流变液的可控电气特性研究

摘要

Magnetorheological fluid(MRF)was prepared using carbonyl iron microparticles as dispersed phase and oleic acid as surfactant. Putting the MRF resistor in the controllable magnetic field, the change of electrical resistance with applied magnetic field and time was analyzed. It reveals that in the absence of magnetic field, the MRF resistor exhibits resistance up to 500MΩ, showing characteristics of insulators, but under increasingly applied field , the resistance decreases rapidly to almost a stable value of less than 200Ω. That is to say, the resistance of MRF could be controlled by changing the applied magnetic field. The giant change of MRF from high to low resistance is similar to the on-off of circuit switch, which provides a basis for studying the controllable electric properties of MRF.%为了研究磁流变液的可控电气特性，以微米级羰基铁粉为分散相、油酸为表面活性剂制备了一种磁流变液。将自制磁流变液电阻器置于可控磁场中，研究了磁流变液电阻随磁场及时间的变化。结果表明，当没有外加磁场时，电阻器电阻大于500MΩ，表现为绝缘体的特性。随外加磁场逐渐变大，电阻值开始迅速减小至200Ω以下后趋于稳定。随着外磁场的变化，电阻值可实现可控调节。磁流变液的这种高阻态到低阻态的转变类似电路开关的开启与断开状态，为研究磁流变液的可控电气特性提供了依据。