水基Ni0.5Zn0.5Fe2O4-SiC二元混合磁流体的稳定性、流变性、热物性与低速润滑性

doi:10.11896/cldb.22040257

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Abstract A50∶50 water-based Ni_0.5Zn_0.5Fe₂O₄-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 Ni_0.5Zn_0.5Fe₂O₄ 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.

Key words： binary hybrid magnetic fluid hydraulic medium rheological properties stability thermal properties low-speed lubricity

Published: 25 October 2023 Online: 2023-10-19

CLC number:

TB34

Fund:National Natural Science Foundation of China (51165012), Regional Innovation Cooperation Project of Sichuan Province (2022YFQ0084), Analysis and Testing Foundation of Kunming University of Science and Technology (2021P20203103003).

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	JIANG Jiajun
	WU Zhangyong
	ZHU Qichen

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JIANG Jiajun,WU Zhangyong,ZHU Qichen. Stability, Rheological Properties, Thermal Properties and Low-speed Lubricity of Water-based Ni_0.5Zn_0.5Fe₂O₄-SiC Binary Hybrid Magnetic Fluid[J]. Materials Reports, 2023, 37(20): 22040257-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22040257 OR http://www.mater-rep.com/EN/Y2023/V37/I20/22040257

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