Please use this identifier to cite or link to this item: http://hdl.handle.net/11452/23779
Title: The effects of graphite, coke and ZnS on the tribological and surface characteristics of automotive brake friction materials
Authors: Uludağ Üniversitesi/Mühendislik Fakültesi/Makine Mühendisliği Bölümü.
Ertan, Rukiye
Yavuz, Nurettin
35772500300
6701698986
Keywords: Engineering
Braking systems
Friction
Wear
Physical properties of materials
Lubricants
Solid lubricants
Wear
Performance
SB2S3
MOS2
Brake linings
Coke
Friction
Friction materials
Graphite
Materials properties
Scanning electron microscopy
Solid lubricants
Surfaces
Zinc sulfide
Automotive brake
Brake friction materials
Brake performance
Braking system
Coefficient of frictions
Effect of temperature
Energy dispersive x-ray
Friction coefficients
Friction layers
Friction surfaces
Friction testers
Non-asbestos
Physical properties of materials
Positive effects
Scanning electron microscope
Surface characteristics
Tests and analysis
Tribological properties
Wear behaviors
Worn surface
Tribology
Issue Date: 2011
Publisher: Emerald Group Publishing
Citation: Ertan, R. ve Yavuz, N. (2011). "The effects of graphite, coke and ZnS on the tribological and surface characteristics of automotive brake friction materials". Industrial Lubrication and Tribology, 63(4), 245-253.
Abstract: Purpose - The purpose of this paper is to investigate the role of solid lubricants (graphite, coke, ZnS) on brake performance. Design/methodology/approach - In this study, the tribological and surface characteristic of non-asbestos organic type brake friction materials containing three different solid lubricants (graphite, coke, and ZnS) in different proportions were examined and evaluated experimentally. The coefficient of friction (COF) and wear behavior of the samples were tested on a chase-type friction tester, and particular emphases were given to the effect of temperature and number of braking cycles on the COF. Each of the lubricants was added to the mixtures in different amounts and seven different brake linings were manufactured, provided that the total amount of solid lubricants and other ingredients were not changed. The worn surfaces of the specimens were analyzed using a scanning electron microscope with energy-dispersive X-ray microanalysis. Findings - The experimental results indicate that graphite has a positive effect on the tribological properties of brake linings. However, brake linings containing higher concentrations of ZnS and coke showed an unstable friction coefficient relationship with the temperature and number of braking cycles. The formation of friction layers was detected on the friction surface of these samples, which indicates that an increase in coke and ZnS content increases the discontinuous and unstable friction film areas. Originality/value - This paper fulfils the effects of solid lubricants (graphite, coke, ZnS) in brake friction materials with detailed tests and analysis.
URI: https://doi.org/10.1108/00368791111140468
https://www.emerald.com/insight/content/doi/10.1108/00368791111140468/full/html
http://hdl.handle.net/11452/23779
ISSN: 0036-8792
Appears in Collections:Scopus
Web of Science

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