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81029

EFFECT OF MAGNETIC FIELD ON FRICTION COEFFICIENT DISPLAYED BY ROLLING BEARINGS

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Last updated: 04 Jan 2025

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Abstract

ABSTRACT
The effect of magnetic field and electric current on the friction coefficient displayed by  rolling bearing greased by lithium grease dispersed by solid lubricants such as graphite, molybdenum disulphide, talc and polymeric particles is investigated.
 
It was shown that the magnetic field had no effect on friction coefficient observed for lithium grease without additives. Addition of talc showed significant increase in friction coefficient. This increase was influenced by magnetic field. No significant effect on friction coefficient was observed for grease dispersed by molybdenum disulphide. Generally molybdenum disulphide displayed relatively lower friction coefficient than graphite and talc. Copper particles dispersed in grease displayed the lowest friction values.  Friction coefficient displayed by grease significantly decreased with increasing electric voltage due to  decrease of grease viscosity as the voltage increased. In the presence of graphite and talc, friction coefficient increased up to maximum then decreased with increasing voltage. Slight friction increase was observed for grease dispersed by copper. The lowest friction coefficient was displayed by molybdenum disulphide dispersing grease.The highest friction coefficient was displayed by grease dispersed by graphite and talc, while the lowest friction was shown for molybdenum disulphidedispersing grease.
 
Grease dispersed by high density polyethylene showed friction decrease. The lowest friction reduction was observed for polymethyl methacrylate. The strong adhesion of polytetrafluroethylene particles into the sliding surfaces significantly increased friction coefficient. It seems that polytetrafluroethylene particles were adhered to surfaces of inner and outer races as well as the balls. Changing the terminal of the voltage applied to the rotating shaft cased significant friction decrease for polymethyl methacrylate. Viscosity of the grease decreased with increasing the voltage. Friction coefficient decreased for high density polyethylene and polytetrafluroethylene. The lowest friction values  were observed at 6 volts which indicated that increasing voltage across the sliding surface could significantly decrease friction coefficient.

DOI

10.21608/jest.2011.81029

Keywords

magnetic field, electric voltage, Friction coefficient, rolling bearing, grease, graphite, molybdenum disulphide, talc, copper and polymers

Authors

First Name

S.

Last Name

Abdel-Sattar

MiddleName

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Affiliation

Faculty of Engineering, Taif University, Al-Taif, SAUDI ARABIA.

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First Name

A.

Last Name

Alahmady

MiddleName

-

Affiliation

Faculty of Engineering, Taif University, Al-Taif, SAUDI ARABIA.

Email

-

City

-

Orcid

-

First Name

W. Y.

Last Name

Ali

MiddleName

-

Affiliation

Faculty of Engineering, Taif University, Al-Taif, SAUDI ARABIA.

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-

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Orcid

-

Volume

8

Article Issue

3

Related Issue

12198

Issue Date

2011-07-01

Receive Date

2011-03-18

Publish Date

2011-07-01

Page Start

27

Page End

39

Print ISSN

2090-5882

Online ISSN

2090-5955

Article File

JEST_Volume 8_Issue 3_Pages 27-39.pdf

PDF . 486.5kB

Link

https://jest.journals.ekb.eg/article_81029.html

Detail API

https://jest.journals.ekb.eg/service?article_code=81029

Order

3

Type

Original Article

Type Code

1,211

Publication Type

Journal

Publication Title

Journal of the Egyptian Society of Tribology

Publication Link

https://jest.journals.ekb.eg/

MainTitle

EFFECT OF MAGNETIC FIELD ON FRICTION COEFFICIENT DISPLAYED BY ROLLING BEARINGS

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Article

Created At

22 Jan 2023