The role of transfer layers on friction characteristics in the sliding interface between friction materials against gray iron brake disks

M. H. Cho, K. H. Cho, S. J. Kim, D. H. Kim, Ho Jang

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

The effect of transfer layer formation on friction performance was studied using a brake friction material containing 15 ingredients. Based on a base formulation, 13 friction material specimens containing different relative amounts of ingredients were produced and they were tested on gray iron disks using a small-scale friction tester. A non-destructive four-point probe technique to measure electrical resistance of the thin film was used to estimate the transfer layer thickness. Results showed that the transfer layer formation was highly dependent on the relative amount of ingredients in the friction material and temperature. Among various ingredients, solid lubricants and iron powders increased the transfer layer thickness but no apparent correlation between transfer layer thickness and the coefficient of friction was found. Strong influence from individual ingredients was observed, dominating the friction characteristics during sliding. On the other hand, the thick transfer layers on the disk surface tended to reduce the friction material waer and the amplitude of the friction coefficient oscillation during sliding.

Original languageEnglish
Pages (from-to)101-108
Number of pages8
JournalTribology Letters
Volume20
Issue number2
DOIs
Publication statusPublished - 2005 Oct 1

Fingerprint

Friction materials
brakes
Brakes
sliding
friction
Iron
Friction
ingredients
iron
coefficient of friction
Solid lubricants
Iron powder
Acoustic impedance
solid lubricants
electrical resistance
test equipment
Thin films
formulations
oscillations
probes

Keywords

  • Brake performance
  • Friction materials
  • Friction oscillation
  • Transfer layer
  • Wear

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering

Cite this

The role of transfer layers on friction characteristics in the sliding interface between friction materials against gray iron brake disks. / Cho, M. H.; Cho, K. H.; Kim, S. J.; Kim, D. H.; Jang, Ho.

In: Tribology Letters, Vol. 20, No. 2, 01.10.2005, p. 101-108.

Research output: Contribution to journalArticle

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