A heating phenomenon exists in the service process of magneto-rheological devices. For magnetorheological devices using magnetorheological grease (MRG) as the working medium, changes in the medium’s rheological behaviors caused by temperature increase will generate challenges in the reliable service of the devices. With laboratory-prepared MRG as the research object, MRG rheological property laws under different temperatures and magnetic field intensities are investigated, and the magnetic properties of carbonyl iron (CI) powder under different temperatures are analyzed. The relationship between the evolution of the MRG structural system and changes in rheological properties under the action of thermomagnetic coupling is discussed. The results show that the MRG structural system is composed of base carrier liquid soap fibers and magnetic chains under the action of a magnetic field, and the soap fibers can strengthen the structural intensity of the MRG. A decrease in the entanglement degree of the soap fiber structure caused by temperature increase will obviously weaken the intensity of the entire MRG system and narrow the regulation and control scope of the MRG rheological properties. The structural evolution of soap fibers under thermomagnetic coupling will affect the chain formation of magnetic particles and ultimately their rheological properties. At low temperature and magnetic field intensity, the entanglement degree of soap fibers is relatively high, and the magnetic force on magnetic particles is weak, which cannot completely overcome the binding of soap fibers. The influence of soap fibers is the dominant factor affecting the MRG rheological properties. As temperature and magnetic field intensity increase, the entanglement degree of soap fibers decreases, magnetic particles gradually disperse from the soap fibers under the action of a large magnetic field force, and the magnetic chain structure gradually becomes the dominant factor affecting the MRG rheological properties. Moreover, the weakening degree of the temperature increase effect on the MRG rheological properties decreases, and the rheological law changes gradually.

磁流变装置的维修过程中会出现发热现象。对于使用磁流变润滑脂（MRG）作为工作介质的磁流变设备，由温度升高引起的介质流变行为的变化将给设备的可靠使用带来挑战。以实验室制备的MRG为研究对象，研究了不同温度和磁场强度下的MRG流变特性规律，并分析了不同温度下羰基铁（CI）粉的磁性能。讨论了在热磁耦合作用下，MRG结构体系的演化与流变性质变化之间的关系。结果表明，MRG结构体系是在磁场的作用下由基体液体皂纤维和磁链组成的，皂纤维可以增强MRG的结构强度。温度升高引起的皂纤维结构纠缠度的降低将明显削弱整个MRG体系的强度，并缩小MRG流变性能的调控范围。肥皂纤维在热磁耦合作用下的结构演变将影响磁性颗粒的链形成，并最终影响其流变性。在低温和磁场强度较大的情况下，肥皂纤维的缠结度较高，作用在磁性颗粒上的磁力较弱，不能完全克服肥皂纤维的粘结性。肥皂纤维的影响是影响MRG流变性能的主要因素。随着温度和磁场强度的增加，肥皂纤维的缠结度降低，在大磁场力的作用下磁性颗粒逐渐从肥皂纤维中分散出来，磁链结构逐渐成为影响MRG流变性能的主导因素。而且，温度升高作用对MRG流变性能的减弱程度减弱，流变规律逐渐变化。磁性粒子在大磁场力的作用下逐渐从皂纤维中分散，磁链结构逐渐成为影响MRG流变性能的主导因素。而且，温度升高作用对MRG流变性能的减弱程度减弱，流变规律逐渐变化。磁性粒子在大磁场力的作用下逐渐从皂纤维中分散，磁链结构逐渐成为影响MRG流变性能的主导因素。而且，温度升高作用对MRG流变性能的减弱程度减弱，流变规律逐渐变化。