Effect of the Abrasive Size on the Friction Effectiveness and Instability of Brake Friction Materials: A Case Study with Zircon

M. W. Shin, Y. H. Kim, H. Jang

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


The friction-induced vibration triggered at the sliding interface between the gray iron disk and brake friction material was studied by changing the size of the zircon particles in the friction material. The friction tests were performed using a reduced brake dynamometer and the friction characteristics of the friction materials containing zircon particles with sizes of 3, 50, and 100 lm were analyzed. Our results show that the properties of the sliding surface were strongly affected by the entrenchment of the abrasive particles in the friction layers during sliding. The friction effectiveness was inversely proportional to the size of the abrasive, while friction instability was pronounced when smaller zircon particles were used. The smaller zircon particles produced larger plateaus on the sliding surface with low contact stiffness. However, the contact plateaus with the low contact stiffness showed higher amplitudes of the friction oscillations, suggesting a surface with low stiffness also can produce high propensity of friction instability during sliding. Based on the friction stability diagram and surface properties, such as contact stiffness and surface roughness, it was suggested that the static coefficient of friction, which was changed as a function of dwell time, was crucial to understand the cause of friction-induced force oscillations and propensity of friction instability of brake friction materials.

Original languageEnglish
Pages (from-to)371-379
Number of pages9
JournalTribology Letters
Issue number3
Publication statusPublished - 2014 Sept

Bibliographical note

Funding Information:
Acknowledgments This study was supported by the Ministry of Knowledge Economy (MKE) through the Parts and Materials Development Program (No. 10040819).


  • Abrasives
  • Brake
  • Friction material
  • Stick-slip
  • Vibration
  • Zircon

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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