Abstract: A50∶50 water-based Ni0.5Zn0.5Fe2O4-SiC binary hybrid magnetic fluid was prepared by a two-step method to improve the thermal properties and lubricity of water-based magnetic fluid and meet the fluid standard of the hydraulic transmission medium. This experiment will examine the sedimentation stability of binary hybrid magnetic fluid under the gravity filed and its layering stability under the magnetic field, selecting the binary hybrid magnetic fluid with the highest level of stability. The differences in rheological properties, thermal properties and low-speed lubricity between binary hybrid magnetic fluid and unitary magnetic fluid were analyzed, where a hydraulic system was built to test the temperature rise characteristics of the system under various medium conditions. The results show that the coating effect of Ni0.5Zn0.5Fe2O4 nanoparticles performs best when the mass fractions of OA and SDBS are 3.0% and 2.0%, respectively. While the mass fraction of CMC is 0.3%—0.6%, it has a significant wetting and dispersing effect on SiC nanoparticles. The delamination stability of binary hybrid magnetic fluid in magnetic field increases with the increase of CMC mass fraction. Under the same dispersion conditions, the viscosity reduces by 21.07% at 80 mT, and the thermal conductivity increases by 26.26% and 25.48% at 40 ℃ and 70 ℃ respectively. In conclusion, the low-speed lubricity of binary hybrid magnetic fluid is better, whereas the temperature rise in the hydraulic system is slower.
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2023, Vol. 37 
