Tribological Properties and Wear Mechanism of Copper-Graphite Composite

Abstract:

Copper-graphite composites were fabricated by spark plasma sintering (SPS) and cold-pressed (CP) processing using a mixture of copper and graphite powders mechanically alloyed. Pin-on-disc wear was used to evaluate the tribological behavior of copper-graphite composites. The results show that the coefficient friction and wear rate decreased considerably with increasing graphite content; with increasing the sintering temperature, the coefficient friction and wear rate just decreased in the same way. XPS analysis of worn surface indicated that better tribological properties are due to a lubricious film covering almost entire worn surface. The presence of this tribolayer improves the friction and wear characteristics when the tribolayer covers almost entire wear surface it effectively restricts metal to metal contact between pin and disc.

• Periodical: Advanced Materials Research (Volumes 472-475)
• Pages: 618-621
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.472-475.618
• Online since: February 2012
• Authors: Li Li Duan, Xu Ran
• Keywords: Copper Base Composite, Friction and Wear, Mechanical Alloying, Spark Plasma Sintering (SPS)

References

[1] ZhuZ, Kuang X, Carotenuto G, et al. Fabrication and properties of carbon fibre-reinforced copper composite by controlled three-step electrodeposition[J]. J. Mater Sci, 1997, 32(4):1061-1067.

[2] Dong S R, TU J P, Zhang X B. An investigation of the sliding wear behavior of Cu-matrix composite reinforced by carbon nanotubes[J]. Mater. Sci. Eng., 2001, A313(1-2): 83-87.

DOI: 10.1016/s0921-5093(01)00963-7

[3] Lovacacik J, Emmer s Blelek J, et al. Effect of composition on friction coefficient of Cu-graphite composites[J]. Wear, 2008, 265(3/4): 417-421.

DOI: 10.1016/j.wear.2007.11.012

[4] Tang Y P, Liu H Z, Zhao H J, et al. Friction and wear properties of copper matrix composites reinforced with short carbon fibers. Mater Design, 2008, 29(1): 257-261.

DOI: 10.1016/j.matdes.2006.11.011

[5] Maxc, HE G Q, He D H, et al. Sliding wear behavior of copper-graphite composite material for use in maglev transportation system.Wear, 2008, 265(7/8):1087-1092.

DOI: 10.1016/j.wear.2008.02.015

[6] Xu J C, Yu H, Xial, et al. Effects of some factors on the tribological properties of the short carbon fiber-reinforced copper composite. Mater Des, 2004, 25(6): 489-493.

[7] Hao Hongqi; Ding Huadong; Li Yawen, et. al. Effect of graphite content on friction and wear properties of copper base material[J]. Transactions of Nonferrous Metals Society of China, 1997, 7(3): 120-124.

[8] Moustafas F, EI-Badry S A, SANAD A M. Effect of graphite with and without copper coating on consodidation behaviour and sintering of copper-graphite composite[J].Powder Metall, 1997, 40(3): 2002-206.

DOI: 10.1179/pom.1997.40.3.201