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Research Papers: Friction and Wear

Effect of Graphite Content on the Tribological Performance of Copper-Matrix Composites Under Different Friction Speeds

[+] Author and Article Information
Han Xiao-Ming, Gao Fei, Su Lin-Lin, Fu Rong, Zhang En

Continuous Extrusion Research Center,
Dalian Jiaotong University,
Dalian 116028, China

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 10, 2016; final manuscript received August 24, 2016; published online March 24, 2017. Assoc. Editor: Dae-Eun Kim.

J. Tribol 139(4), 041601 (Mar 24, 2017) (5 pages) Paper No: TRIB-16-1121; doi: 10.1115/1.4035014 History: Received April 10, 2016; Revised August 24, 2016

The effect of graphite (Gr) content on tribological performance of copper-matrix composites against H13 steel was investigated using a pin-on-disk test in the range of 3.14–47.1 m/s. The composites with different weight fractions of Gr (up to 18%) were fabricated by powder metallurgy technique. The results showed that the friction coefficient and wear rate generally decreased with the increase in Gr content. However, the friction coefficient and wear rate differ at various speeds. At 200 and 500 r/min, the friction coefficient and wear rate kept lower with the increase in Gr content, because the third body of Cu–Al–3%Gr specimen had strong fluidity and plasticity. By contrast, the particle third body of Cu–Al–12%Gr specimen, which contained higher content of Gr, could roll easily. Increased Gr feeding to the third body was reasonable for the decreasing of friction coefficient and wear with the increasing of the amount of Gr content at the speed in the range of 1000–2000 r/min. Under the high-speed, the friction coefficient showed slight change because the friction temperature induced all the third bodies to extend and flow effortlessly without componential influence. However, wear decreased significantly because the third body possessed more metal, which favored attachment to the counter disk.

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Figures

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Fig. 1

The effect of Gr on (a) the friction coefficient and (b) the wear rate

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Fig. 2

The friction surface and Gr particles change with time (a) 6 s, (b) 60 s, and (c) 70 s

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Fig. 3

(a) Cross section and (b) Energy spectrum of third bodies

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Fig. 4

(a) The worn surfaces morphologies of Cu–Al–3%Gr at speed 200 r/min and (b) the tongue layers

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Fig. 5

(a) The worn surface of Cu–Al–12%Gr at speed 200 r/min and (b) particles third body and irregular flake third body gather in pit

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Fig. 6

The c content of third body at speed 200 r/min

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Fig. 7

The worn surfaces of (a) Cu–Al–3%Gr and (b) Cu–Al–12%Gr at speed 2000 r/min

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Fig. 8

The surface 3D-profiles at speed 200 r/min (a) Cu–Al–3%Gr and (b) Cu–Al–12%Gr

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Fig. 9

The surface 3D-profiles at speed 2000 r/min (a) Cu–Al–3%Gr and (b) Cu–Al–12%Gr

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Fig. 10

The c content of third body at speed 2000 r/min

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