Effect of reinforcement volume fraction and size distribution on the tribological behavior of Al-composite/brake pad tribo-couple

Tribological behavior of aluminium matrix composite (AMC)/brake pad tribo-couple under dry sliding conditions was studied using Pin-on-Disc machine. Brake pad material was used as pins while the AMC formed the rotating disc. Series of experiments were performed to characterize the tribological natur...

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Bibliographic Details
Published in:Wear 2006-06, Vol.260 (11), p.1248-1255
Main Authors: Uyyuru, R.K., Surappa, M.K., Brusethaug, S.
Format: Article
Language:English
Subjects:
AMC
Applied sciences
Brake pad
Drives
Dry sliding wear
Exact sciences and technology
Friction, wear, lubrication
Machine components
Mechanical engineering. Machine design
Pin-on-Disc (PoD) machine
Shafts, couplings, clutches, brakes
Solid lubricant
Tribo-layer
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Summary:Tribological behavior of aluminium matrix composite (AMC)/brake pad tribo-couple under dry sliding conditions was studied using Pin-on-Disc machine. Brake pad material was used as pins while the AMC formed the rotating disc. Series of experiments were performed to characterize the tribological nature of the tribo-couple. Load and sliding speeds were varied over a range to represent actual braking conditions in passenger cars. Effect of volume fraction and size distribution of reinforcement on wear and friction coefficient has been studied. It was observed that a heterogeneous tribo-layer was formed over the worn surfaces during the wear tests. Presence of tribo-layer was believed to cause two effects: acting as a lubricant layer and acting as a source of wear debris. Morphology and topography of worn surfaces and debris were studied using scanning electron microscope (SEM), electron probe micro analyzer (EPMA), and X-ray diffraction (XRD) techniques. When the reinforcement in the matrix has wide size distribution, wear rate and friction coefficients are found to be higher compared to composite containing mono-size reinforcement.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2005.08.011