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Technical Briefs

Friction and Wear Behavior of Graphite-Carbon Short Fiber Reinforced Al–17%Si Alloy Hybrid Composites

[+] Author and Article Information
C. S. Ramesh

Department of Mechanical Engineering, P.E.S. Institute of Technology, 560085, Bangalore, Indiacsr_gce@yahoo.co.inDepartment of Mechanical Engineering, Dr.MGR Educational and Research Institute, Chennai-95, Indiacsr_gce@yahoo.co.in

T. B. Prasad

Department of Mechanical Engineering, P.E.S. Institute of Technology, 560085, Bangalore, Indiaprasadtb@indiatimes.comDepartment of Mechanical Engineering, Dr.MGR Educational and Research Institute, Chennai-95, Indiaprasadtb@indiatimes.com

J. Tribol 131(1), 014501 (Dec 03, 2008) (5 pages) doi:10.1115/1.2991124 History: Received March 15, 2008; Revised August 25, 2008; Published December 03, 2008

Graphite and carbon short fiber (copper coated) reinforced (2wt%) hypereutectic Al–17%Si alloy composites were prepared by liquid metallurgy route. Room temperature friction and wear properties of as-cast hypereutectic Al–Si alloy reinforced with copper coated graphite and short carbon fibers were investigated. Friction and wear tests were conducted using a pin-on-disk machine under dry sliding conditions. The loads (contact pressure) and sliding velocities have been varied from 10 N to 50 N (contact pressure of 0.12–0.60 MPa) and 0.3 m/s to 1.2 m/s, respectively. The results reveal that the coefficient of friction and the wear rate of the hybrid composite are lower than that of the matrix alloy. The coefficient of friction of the matrix alloy and its hybrid composite decreased with increased load of up to 30 N and increased beyond this load. The wear rates of both the matrix alloy and its hybrid composite increased with the increasing load. However, at all the loads and sliding velocities studied, the developed hybrid composite exhibited a lower coefficient of friction and wear rates when compared with the matrix alloy.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

SEM photographs of (a) uncoated and (b) copper coated graphite particulates

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Figure 2

SEM photographs of (a) uncoated carbon fibers and (b) copper coated carbon short fibers

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Figure 3

SEM micrographs of hypereutectic (a) Al–Si-alloy, (b) Al–Si-2 wt % graphite, (c) Al–Si-2 wt % carbon fiber, and (d) Al–Si-2 wt % graphite-2 wt % short carbon fiber

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Figure 4

Variation in the coefficient of friction with load

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Figure 5

Variation in the coefficient of friction with sliding velocity

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Figure 6

Variation in wear rate with sliding velocity

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Figure 7

Variation in wear rate with load

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Figure 8

SEM of worn surfaces of hypereutectic (a) Al–Si-piston alloy, (b) Al–Si-2 wt % graphite, (c) Al–Si-2 wt % carbon fiber, and (d) Al–Si-2 wt % graphite-2 wt % short carbon fiber hybrid composite at a load of 40 N and at a sliding velocity of 1.2 m/s

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Figure 9

SEM of wear debris at a load of 40 N and at a sliding velocity of 1.2 m/s

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