The effect of humidity on the rolling resistance of silver coatings modified by plasma surface treatments

Seung Ho Yang, Hosung Kong, Sung Chang Choi, Dae Eun Kim

Research output: Contribution to journalArticle

Abstract

Rolling behavior of plasma-modified silver films was experimentally evaluated under various environments using a thrust ball bearing-typed test rig. The silver films were coated on AISI 52100 bearing races by a thermal evaporation method where the thickness was about 1.4 μm. Plasma surface modification was performed on the silver-coated specimens in order to change the water-wetting characteristics of the surfaces. Tests were performed in ambient air, dry air and vacuum under the normal load of 147 N and at the rotating speed of 31 mm/s, and the rolling resistances were measured with the contact cycles. The wetting angles were measured by Contact Anglemeter and the surfaces were analyzed by Fourier transformation infrared spectroscope and scanning electron microscope. Results showed that rolling resistance of plasma-modified silver-coated films was greatly affected by humidity. Rolling resistance of plasma-modified hydrophobic silver film showed its minimum value at a relative humidity of 80% while that of the modified hydrophilic silver film showed its minimum value at a relative humidity of 10%. It was found that the changes in wetting angle influenced remarkable the silver debris agglomeration and the tendency of contact patch formation. Analyses suggested that the dependence of the rolling resistance on humidity could be explained by the fact that adsorbed water vapors affected the wear debris agglomeration and resulted in the different behavior of rolling resistance with humidity.

Original languageEnglish
Pages (from-to)780-787
Number of pages8
JournalWear
Volume249
Issue number9
DOIs
Publication statusPublished - 2001 Sep 1

Fingerprint

Rolling resistance
surface treatment
Silver
Surface treatment
humidity
Atmospheric humidity
silver
Plasmas
coatings
Coatings
wetting
Wetting
agglomeration
debris
Debris
Bearings (structural)
Agglomeration
thrust bearings
ball bearings
Thrust bearings

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 ; Choi, Sung Chang ; Kim, Dae Eun. / The effect of humidity on the rolling resistance of silver coatings modified by plasma surface treatments. In: Wear. 2001 ; Vol. 249, No. 9. pp. 780-787.
@article{b0a127453de04377935162536005c02c,
title = "The effect of humidity on the rolling resistance of silver coatings modified by plasma surface treatments",
abstract = "Rolling behavior of plasma-modified silver films was experimentally evaluated under various environments using a thrust ball bearing-typed test rig. The silver films were coated on AISI 52100 bearing races by a thermal evaporation method where the thickness was about 1.4 μm. Plasma surface modification was performed on the silver-coated specimens in order to change the water-wetting characteristics of the surfaces. Tests were performed in ambient air, dry air and vacuum under the normal load of 147 N and at the rotating speed of 31 mm/s, and the rolling resistances were measured with the contact cycles. The wetting angles were measured by Contact Anglemeter and the surfaces were analyzed by Fourier transformation infrared spectroscope and scanning electron microscope. Results showed that rolling resistance of plasma-modified silver-coated films was greatly affected by humidity. Rolling resistance of plasma-modified hydrophobic silver film showed its minimum value at a relative humidity of 80{\%} while that of the modified hydrophilic silver film showed its minimum value at a relative humidity of 10{\%}. It was found that the changes in wetting angle influenced remarkable the silver debris agglomeration and the tendency of contact patch formation. Analyses suggested that the dependence of the rolling resistance on humidity could be explained by the fact that adsorbed water vapors affected the wear debris agglomeration and resulted in the different behavior of rolling resistance with humidity.",
author = "Yang, {Seung Ho} and Hosung Kong and Choi, {Sung Chang} and Kim, {Dae Eun}",
year = "2001",
month = "9",
day = "1",
doi = "10.1016/S0043-1648(01)00809-2",
language = "English",
volume = "249",
pages = "780--787",
journal = "Wear",
issn = "0043-1648",
publisher = "Elsevier BV",
number = "9",

}

The effect of humidity on the rolling resistance of silver coatings modified by plasma surface treatments. / Yang, Seung Ho; Kong, Hosung; Choi, Sung Chang; Kim, Dae Eun.

In: Wear, Vol. 249, No. 9, 01.09.2001, p. 780-787.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The effect of humidity on the rolling resistance of silver coatings modified by plasma surface treatments

AU - Yang, Seung Ho

AU - Kong, Hosung

AU - Choi, Sung Chang

AU - Kim, Dae Eun

PY - 2001/9/1

Y1 - 2001/9/1

N2 - Rolling behavior of plasma-modified silver films was experimentally evaluated under various environments using a thrust ball bearing-typed test rig. The silver films were coated on AISI 52100 bearing races by a thermal evaporation method where the thickness was about 1.4 μm. Plasma surface modification was performed on the silver-coated specimens in order to change the water-wetting characteristics of the surfaces. Tests were performed in ambient air, dry air and vacuum under the normal load of 147 N and at the rotating speed of 31 mm/s, and the rolling resistances were measured with the contact cycles. The wetting angles were measured by Contact Anglemeter and the surfaces were analyzed by Fourier transformation infrared spectroscope and scanning electron microscope. Results showed that rolling resistance of plasma-modified silver-coated films was greatly affected by humidity. Rolling resistance of plasma-modified hydrophobic silver film showed its minimum value at a relative humidity of 80% while that of the modified hydrophilic silver film showed its minimum value at a relative humidity of 10%. It was found that the changes in wetting angle influenced remarkable the silver debris agglomeration and the tendency of contact patch formation. Analyses suggested that the dependence of the rolling resistance on humidity could be explained by the fact that adsorbed water vapors affected the wear debris agglomeration and resulted in the different behavior of rolling resistance with humidity.

AB - Rolling behavior of plasma-modified silver films was experimentally evaluated under various environments using a thrust ball bearing-typed test rig. The silver films were coated on AISI 52100 bearing races by a thermal evaporation method where the thickness was about 1.4 μm. Plasma surface modification was performed on the silver-coated specimens in order to change the water-wetting characteristics of the surfaces. Tests were performed in ambient air, dry air and vacuum under the normal load of 147 N and at the rotating speed of 31 mm/s, and the rolling resistances were measured with the contact cycles. The wetting angles were measured by Contact Anglemeter and the surfaces were analyzed by Fourier transformation infrared spectroscope and scanning electron microscope. Results showed that rolling resistance of plasma-modified silver-coated films was greatly affected by humidity. Rolling resistance of plasma-modified hydrophobic silver film showed its minimum value at a relative humidity of 80% while that of the modified hydrophilic silver film showed its minimum value at a relative humidity of 10%. It was found that the changes in wetting angle influenced remarkable the silver debris agglomeration and the tendency of contact patch formation. Analyses suggested that the dependence of the rolling resistance on humidity could be explained by the fact that adsorbed water vapors affected the wear debris agglomeration and resulted in the different behavior of rolling resistance with humidity.

UR - http://www.scopus.com/inward/record.url?scp=0035444763&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035444763&partnerID=8YFLogxK

U2 - 10.1016/S0043-1648(01)00809-2

DO - 10.1016/S0043-1648(01)00809-2

M3 - Article

VL - 249

SP - 780

EP - 787

JO - Wear

JF - Wear

SN - 0043-1648

IS - 9

ER -