NiFe<sub>2</sub>O<sub>4</sub>磁流体润滑性实验研究

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Abstract To verify the feasibility of water-based NiFe₂O₄ magnetic fluid replacing traditional hydraulic medium, the wear problem of blade-stator pair was solved by using magnetic fluid hydraulic medium. Firstly, water-based NiFe₂O₄ magnetic fluid was prepared by two-step method. According to the requirement of vane pump for medium viscosity, magnetic fluids with strong dispersion stability and good viscosity characteristics were selected. Then, from the aspects of test method, equipment, instrument, tool and influencing factors, the test scheme was drawn up. Among them, friction coefficient (μ) and wear rate (Δm) were characterized. Influencing factors include dispersant, viscosity reducer, base fluid, concentration, magnetic induction strength, load force, downward sample shaft speed and friction time, 46 # anti-wear hydraulic oil was used as a reference object for comparison. Finally, according to the test results, the relevant mechanism was analyzed. In the absence of magnetic field, the lubrication of magnetic fluid with a concentration of 5% was better. After the magnetic field was applied, the lubricity was better than that of hydraulic oil when the magnetic induction intensity reaches the maximum and the concentration of magnetic fluid was 6%. This result provides a re-ference value for the application of magnetic fluid in the field of hydraulic transmission.

Key words： water-based NiFe₂O₄ magnetic fluid hydraulic medium friction factor wearing capacity lubrication

Published: 05 July 2019

CLC number:

TB34

About author:: Fei Gong graduated from Kunming University of Science and Technology in June 2016 with a bachelor’s degree in engineering. Since September 2017, he has been training in the functional fluid application and mine electromechanical engineering research institute of the College of Mechanical and Electrical Engineering of Kunming University of Science and Technology, mainly engaged in fluid transmission and control research.Zhangyong Wu, director of the Institute of Functional Fluid Applications and Mine Electromechanical Engineering, College of Mechanical and Electrical Enginee-ring, Kunming University of Science and Technology. Born in May 1963, master of mechanical manufacturing and automation and he became a senior engineer in 1996, Named professor in 2004.The main research directions are water-based hydraulic transmission techno-logy, electro-hydraulic digital control technology, new hydraulic media, components and systems. In recent years, he has hosted and participated in more than 20 scientific research projects, published more than 50 papers, participated in the compilation of 1 textbook and 1 monograph, won 1 first prize and 2 third prize of Yunnan Science and Technology Progress Award, and obtained invention patent 13 More than 60 patents for utility and utility models.

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	GONG Fei
	WU Zhangyong
	ZHU Qichen
	ZHANG Lianzhi
	GUO Cuixia
	WANG Xueting

Cite this article:

GONG Fei,WU Zhangyong,ZHU Qichen, et al. Experimental Study on the Lubricity of NiFe₂O₄ Magnetic Fluid[J]. Materials Reports, 2019, 33(z1): 126-131.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2019/V33/Iz1/126

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