Microstructural characteristics on the surface and subsurface of semimetallic automotive friction materials during braking process

R. J. Talib, Andanastuti Muchtar, Che Husna Azhari

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

In this study, a series of friction tests on semimetallic automotive friction materials were conducted on a friction test machine by pressing test samples against a rotating cast iron brake disc, thus simulating actual braking. After each friction test, the morphological changes of the wear surface and subsurface were investigated using scanning electron microscopy. Microstructural examinations showed that the major wear mechanisms in operation during braking are comprised of the following: (i) abrasive, (ii) adhesive, (iii) fatigue, (iv) delamination, and (v) thermal. The wear mechanism and wear transition are found to be influenced by the applied loads and braking times. In the study of the subsurface morphology, microcracks generated in the subsurface are thought to be due to the following phenomena; (i) growth of microvoids, (ii) coalescence of microvoids, (iii) coalescence of second phase particles, and (iv) coalescence of microvoids and second phase particles. The microcracks generated in the subsurface grew and propagated parallel to the sliding surface as the braking times as well as applied loads are increased. Finally, the microcracks grew and joined each other producing wear particles on subsequent braking. These mechanical and thermal failures manifested a complex wear mechanism, causing plastic collapse in the local region which subsequently produced wear particles in different shapes depending on the modes of failure.

Original languageEnglish
Pages (from-to)694-699
Number of pages6
JournalJournal of Materials Processing Technology
Volume140
Issue number1-3 SPEC.
DOIs
Publication statusPublished - 22 Sep 2003

Fingerprint

Friction materials
Braking
Wear of materials
Microcracks
Coalescence
Friction
Particles (particulate matter)
Cast iron
Abrasives
Brakes
Delamination
Adhesives
Fatigue of materials
Plastics
Scanning electron microscopy

Keywords

  • Friction materials
  • Microcrack
  • Microstructure
  • Microvoid
  • Wear mechanism

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Microstructural characteristics on the surface and subsurface of semimetallic automotive friction materials during braking process. / Talib, R. J.; Muchtar, Andanastuti; Azhari, Che Husna.

In: Journal of Materials Processing Technology, Vol. 140, No. 1-3 SPEC., 22.09.2003, p. 694-699.

Research output: Contribution to journalArticle

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