Studies with Rheological Behavior of Composite Lithium-Based Magnetorheological Grease

Magnetorheological (MR) grease has advantages of the anti-settlement behavior and excellent sealing property compared with conventional MR materials. However, the rheological behaviors of MR effect and shear yield stress are too small to limit the further applications with MR grease. This paper prop...

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Autores principales: Hua Yan, Pingyang Li, Chi Duan, Xiaomin Dong
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Publicado: MDPI AG 2021
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spelling oai:doaj.org-article:70ad401085e548a7b1aeb04adc7f06352021-11-25T18:22:14ZStudies with Rheological Behavior of Composite Lithium-Based Magnetorheological Grease10.3390/met111118262075-4701https://doaj.org/article/70ad401085e548a7b1aeb04adc7f06352021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1826https://doaj.org/toc/2075-4701Magnetorheological (MR) grease has advantages of the anti-settlement behavior and excellent sealing property compared with conventional MR materials. However, the rheological behaviors of MR effect and shear yield stress are too small to limit the further applications with MR grease. This paper proposes a composite lithium-based MR grease with boric acid-hydroxyl stearic acid to improve the rheological behaviors. Eight different samples of composite lithium-based MR grease with different ratios of mass between lithium stearate and lithium borate are prepared by the saponification method. The rheological behaviors are tested and discussed with qualitative and quantitative analysis. The experimental results show that the off-state viscosity reduces with the decrement of the ratio of mass under low shear rate which changes from 68.7 Pa·s to 16.5 Pa·s. Lithium stearate content has more effects with off-state viscosity. Based on the Herschel-Bingham model, the shear stress of composite lithium-based MR grease can be improved dramatically by adjusting the ratio of mass which is increased by 170% under the magnetic flux density of 0.2 T. Compared with single lithium-based MR grease, the maximum yield shear stress is increased by 166.7% at off-state and the maximum MR effect is also increased by 19.1%. The MR effect can reach 23,600% with a specific mass ratio of the composite MR grease. The experimental results validate that the feasibility of the performance improvement by the composite lithium-based MR grease.Hua YanPingyang LiChi DuanXiaomin DongMDPI AGarticlecomposite lithium-based magnetorheological greaseratio of massrheological behaviorMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1826, p 1826 (2021)
institution DOAJ
collection DOAJ
language EN
topic composite lithium-based magnetorheological grease
ratio of mass
rheological behavior
Mining engineering. Metallurgy
TN1-997
spellingShingle composite lithium-based magnetorheological grease
ratio of mass
rheological behavior
Mining engineering. Metallurgy
TN1-997
Hua Yan
Pingyang Li
Chi Duan
Xiaomin Dong
Studies with Rheological Behavior of Composite Lithium-Based Magnetorheological Grease
description Magnetorheological (MR) grease has advantages of the anti-settlement behavior and excellent sealing property compared with conventional MR materials. However, the rheological behaviors of MR effect and shear yield stress are too small to limit the further applications with MR grease. This paper proposes a composite lithium-based MR grease with boric acid-hydroxyl stearic acid to improve the rheological behaviors. Eight different samples of composite lithium-based MR grease with different ratios of mass between lithium stearate and lithium borate are prepared by the saponification method. The rheological behaviors are tested and discussed with qualitative and quantitative analysis. The experimental results show that the off-state viscosity reduces with the decrement of the ratio of mass under low shear rate which changes from 68.7 Pa·s to 16.5 Pa·s. Lithium stearate content has more effects with off-state viscosity. Based on the Herschel-Bingham model, the shear stress of composite lithium-based MR grease can be improved dramatically by adjusting the ratio of mass which is increased by 170% under the magnetic flux density of 0.2 T. Compared with single lithium-based MR grease, the maximum yield shear stress is increased by 166.7% at off-state and the maximum MR effect is also increased by 19.1%. The MR effect can reach 23,600% with a specific mass ratio of the composite MR grease. The experimental results validate that the feasibility of the performance improvement by the composite lithium-based MR grease.
format article
author Hua Yan
Pingyang Li
Chi Duan
Xiaomin Dong
author_facet Hua Yan
Pingyang Li
Chi Duan
Xiaomin Dong
author_sort Hua Yan
title Studies with Rheological Behavior of Composite Lithium-Based Magnetorheological Grease
title_short Studies with Rheological Behavior of Composite Lithium-Based Magnetorheological Grease
title_full Studies with Rheological Behavior of Composite Lithium-Based Magnetorheological Grease
title_fullStr Studies with Rheological Behavior of Composite Lithium-Based Magnetorheological Grease
title_full_unstemmed Studies with Rheological Behavior of Composite Lithium-Based Magnetorheological Grease
title_sort studies with rheological behavior of composite lithium-based magnetorheological grease
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/70ad401085e548a7b1aeb04adc7f0635
work_keys_str_mv AT huayan studieswithrheologicalbehaviorofcompositelithiumbasedmagnetorheologicalgrease
AT pingyangli studieswithrheologicalbehaviorofcompositelithiumbasedmagnetorheologicalgrease
AT chiduan studieswithrheologicalbehaviorofcompositelithiumbasedmagnetorheologicalgrease
AT xiaomindong studieswithrheologicalbehaviorofcompositelithiumbasedmagnetorheologicalgrease
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