Influence of Thermal Oxidation on Molecular Structure and MagnetorheologicalPerformance of Lithium-Based Magnetorheological Grease

HU Zhide; ZHANG Hansong; WANG Dawei; BIAN Fei; JIANG Haoyang

doi:10.11973/jxgccl202306006

Materials and Mechanical Engineering > 2023 > 47(6): 30-35. > DOI: 10.11973/jxgccl202306006

HU Zhide, ZHANG Hansong, WANG Dawei, BIAN Fei, JIANG Haoyang. Influence of Thermal Oxidation on Molecular Structure and MagnetorheologicalPerformance of Lithium-Based Magnetorheological Grease[J]. Materials and Mechanical Engineering, 2023, 47(6): 30-35. DOI: 10.11973/jxgccl202306006

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Influence of Thermal Oxidation on Molecular Structure and MagnetorheologicalPerformance of Lithium-Based Magnetorheological Grease

1. Army Logistics Academy, Chongqing 401311, China;
2. Avic Shaanxi Aircraft Industry (Group) Corporation LTD, Hanzhong 723212, China

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Received Date: April 11, 2022
Revised Date: May 08, 2023

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Abstract

Lithium-based magnetorheological grease (MRG) was prepared by in-situ saponification method with ethyl silicone oil, carbonyl iron powder, dodecyl hydroxy stearic acid and lithium hydroxide as raw materials, and then was thermally oxidized at 60, 120, 180 ℃, respectively. The effect of thermal oxidation on the mass, molecular structure, static yield stress and magnetorheological performance of MRG was studied. The results show that thermal oxidation could cause the mass loss of MRG, reduce the content of -CH₃, -CH₂- and Si-C₂H₅ groups in ethyl silicone oil molecules, and increase the content of crosslinked Si-O-Si. With the increase of thermal oxidation temperature, the shear stress and static yield stress of MRG increased, and the adjustable range of storage modulus under magnetic field became smaller. After thermal oxidation at 60 ℃ for 15 d, the magnetorheological effect of MRG still maintained 84.6% of that without thermal oxidation. When the temperature reached 180 ℃, the directional arrangement of magnetic particles excited by magnetic field was blocked, leading to the sharp decrease of magnetorheological effect.
- magnetorheological grease,
- thermal oxidation,
- molecular structure,
- magnetorheological effect

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