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Tribological and mechanical behavior of multilayer Cu/SiC + Gr hybrid composites for brake friction material applications
Published in Elsevier Ltd
2014
Volume: 317
   
Issue: 1-2
Pages: 201 - 212
Abstract
In this paper, we study the wear resistance of multi-layered composites of Cu/SiC + Gr hybrid composites prepared by layer compaction and pressure sintering. The tribological behavior and wear resistance of the composites were evaluated at a range of sliding speeds (5, 10, 30 and 35m/s) in a laboratory scale inertia brake dynamometer for brake friction material applications. The wear surface morphology and mechanisms were studied using scanning electron microscopy (SEM), XRD, and stereoscopy. The microstructure of the composites was also characterized using SEM and optical microscopy and the mechanical response in compression and flexure was evaluated. The results of these tests indicate that the density, wear resistance, braking behavior and mechanical response can be significantly improved by the presence of a layer of copper away from the sliding surface. The presence of the layer also improved friction and wear resistance significantly. The formation of mechanically mixed tribolayer and oxides (Fe3O4) reduced the wear rate and stabilized the friction coefficient at 30 and 35m/s. Finally, crack deflection and branching at the interface between the composite and Cu layers improved the flexural strength of the layered composites. The fractography analysis indicates a quasi-cleavage intergranular fracture in the composite layer and a purely ductile fracture in the Cu layer. © 2014 Elsevier B.V.
About the journal
JournalData powered by TypesetWear
PublisherData powered by TypesetElsevier Ltd
ISSN00431648
Open AccessNo
Concepts (30)
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    Brakes
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    Compaction
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    Ductile fracture
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    Dynamometers
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    FRACTURE MECHANICS
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    FRICTION MATERIALS
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    LUNAR SURFACE ANALYSIS
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    Metal testing
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    OPTICAL DATA STORAGE
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    Optical microscopy
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    Scanning electron microscopy
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    Sintering
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    Stereo image processing
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    Surface analysis
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    Tribology
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    Wear resistance
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    Fracture
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    Friction
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    FRICTION MATERIALS
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    LUNAR SURFACE ANALYSIS
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    Metallic matrix composites
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    OPTICAL DATA STORAGE
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    BRAKE FRICTION MATERIALS
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    FRICTION AND WEAR RESISTANCE
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    Friction coefficients
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    INTERGRANULAR FRACTURE
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    Mechanical behavior
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    MULTI-LAYERED COMPOSITES
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    TRIBOLOGICAL BEHAVIORS
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    WEAR-TESTING