An experimental study on the rolling resistance of bearings coated by pure silver

Seung Ho Yang, Hosung Kong, Eui Sung Yoon, Dae Eun Kim

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

An experimental study was performed to discover the effect of a soft metallic coating on the behavior of rolling resistance. Pure silver was coated on AISI 52100 bearing steel by a thermal evaporation method, where the coating thickness ranged from 100 nm to 4400 nm. A thrust ball bearing-type test rig was used and the rolling resistance was measured in various environmental conditions such as ambient air, vacuum, dry air and controlled humidity. The surfaces were analyzed by SEM and EPMA. Results generally showed that minimum rolling resistance was obtained after the initial coating film was apparently worn. The decrease of rolling resistance resulted mainly from shakedown phenomena which occurred at the contact patches of agglomerated wear particles. It was also found that rolling resistance was affected strongly by environmental conditions. Results in various environmental conditions suggested that humidity related closely to the agglomeration of particles that affected significantly the rolling resistance. The influence of humidity on particle agglomeration was further investigated by using a plasma surface modification that changed the wetting angle of coated films.

Original languageEnglish
Pages (from-to)119-126
Number of pages8
JournalWear
Volume225-229
Issue numberI
DOIs
Publication statusPublished - 1999 Jan 1
EventProceedings of the 1999 12th International Conference on Wear of Materials, WOM-99 - Atlanta, GA, United States
Duration: 1999 Apr 251999 Apr 29

Fingerprint

Bearings (structural)
Rolling resistance
Silver
silver
humidity
Atmospheric humidity
agglomeration
coatings
Coatings
Agglomeration
thrust bearings
ball bearings
Thrust bearings
Thermal evaporation
Steel
air
Electron probe microanalysis
Air
wetting
Wetting

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Yang, Seung Ho ; Kong, Hosung ; Yoon, Eui Sung ; Kim, Dae Eun. / An experimental study on the rolling resistance of bearings coated by pure silver. In: Wear. 1999 ; Vol. 225-229, No. I. pp. 119-126.
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An experimental study on the rolling resistance of bearings coated by pure silver. / Yang, Seung Ho; Kong, Hosung; Yoon, Eui Sung; Kim, Dae Eun.

In: Wear, Vol. 225-229, No. I, 01.01.1999, p. 119-126.

Research output: Contribution to journalConference article

TY - JOUR

T1 - An experimental study on the rolling resistance of bearings coated by pure silver

AU - Yang, Seung Ho

AU - Kong, Hosung

AU - Yoon, Eui Sung

AU - Kim, Dae Eun

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AB - An experimental study was performed to discover the effect of a soft metallic coating on the behavior of rolling resistance. Pure silver was coated on AISI 52100 bearing steel by a thermal evaporation method, where the coating thickness ranged from 100 nm to 4400 nm. A thrust ball bearing-type test rig was used and the rolling resistance was measured in various environmental conditions such as ambient air, vacuum, dry air and controlled humidity. The surfaces were analyzed by SEM and EPMA. Results generally showed that minimum rolling resistance was obtained after the initial coating film was apparently worn. The decrease of rolling resistance resulted mainly from shakedown phenomena which occurred at the contact patches of agglomerated wear particles. It was also found that rolling resistance was affected strongly by environmental conditions. Results in various environmental conditions suggested that humidity related closely to the agglomeration of particles that affected significantly the rolling resistance. The influence of humidity on particle agglomeration was further investigated by using a plasma surface modification that changed the wetting angle of coated films.

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