The tribological performance of 6061 aluminum alloy/graphite composite materials in oil lubrications with EP additives

Jen-Fin Lin, Ming Guu Shih, Yih Wei Chen

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A thrust-on-washer adapter was applied to simulate surface contacts under oil lubrications. The upper, ring-style specimens were prepared using A356.0 aluminum alloy material; the lower, disk-style specimens were prepared using a composite material of 6061 aluminum alloy and graphite. The load applications were increased so that friction contacts ranged from hydrodynamic or mixed lubrication to boundary lubrication. The tribological mechanism and antiseizure performance of oil with different extreme pressure (EP) additive concentrations was shown to relate closely to friction coefficients, Stribeck curves, electrical voltage variations, wear mechanisms, and chemical products in wear debris. The experimental results reveal that the occurrence of surface seizure is dependent upon the value of the oil temperature rise per second, rather than the oil temperature itself. When the initial oil temperature was kept at 25°C, raising the EP additive concentration shortened the time before surface seizure occurred. When the initial oil temperature was 70°C, an increase in the EP additive concentration fully prevented surface seizure. Under boundary lubrication conditions, the EP additive alone was unable to generate chemically reactive films regardless of oil temperatures; the antiwear performance occurred only in tribosurfaces when operating in hydrodynamic or mixed lubrication regimes.

Original languageEnglish
Pages (from-to)58-70
Number of pages13
JournalWear
Volume198
Issue number1-2
DOIs
Publication statusPublished - 1996 Jan 1

Fingerprint

Graphite
lubrication
aluminum alloys
Lubrication
Aluminum alloys
Oils
graphite
oils
composite materials
seizures
Composite materials
boundary lubrication
Hydrodynamics
Temperature
hydrodynamics
temperature
Wear of materials
Friction
washers
adapters

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "A thrust-on-washer adapter was applied to simulate surface contacts under oil lubrications. The upper, ring-style specimens were prepared using A356.0 aluminum alloy material; the lower, disk-style specimens were prepared using a composite material of 6061 aluminum alloy and graphite. The load applications were increased so that friction contacts ranged from hydrodynamic or mixed lubrication to boundary lubrication. The tribological mechanism and antiseizure performance of oil with different extreme pressure (EP) additive concentrations was shown to relate closely to friction coefficients, Stribeck curves, electrical voltage variations, wear mechanisms, and chemical products in wear debris. The experimental results reveal that the occurrence of surface seizure is dependent upon the value of the oil temperature rise per second, rather than the oil temperature itself. When the initial oil temperature was kept at 25°C, raising the EP additive concentration shortened the time before surface seizure occurred. When the initial oil temperature was 70°C, an increase in the EP additive concentration fully prevented surface seizure. Under boundary lubrication conditions, the EP additive alone was unable to generate chemically reactive films regardless of oil temperatures; the antiwear performance occurred only in tribosurfaces when operating in hydrodynamic or mixed lubrication regimes.",
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The tribological performance of 6061 aluminum alloy/graphite composite materials in oil lubrications with EP additives. / Lin, Jen-Fin; Shih, Ming Guu; Chen, Yih Wei.

In: Wear, Vol. 198, No. 1-2, 01.01.1996, p. 58-70.

Research output: Contribution to journalArticle

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