Fabrication of Self-Lubricating Cu-Based Composite Containing Graphite Particle by Centrifugal Mixed-Powder Casting

Abstract:

Reduction of frictional coefficient at sliding position can improve wear resistance of material. In previous studies, Cu-based composites containing graphite particles have been reported. Since graphite is better lubrication material, the Cu-based composites containing graphite particles have better wear property comparing with the pure Cu. However, these composites are mainly fabricated by sintering method and its strength is relatively low. In this study, Cu-based composites containing graphite particles are fabricated by centrifugal mixed-powder casting. The centrifugal mixed-powder casting is novel centrifugal casting method combined with powder metallurgy. Using this casting method, the Cu-based composites containing graphite particles are successfully obtained. The graphite particles are distributed in the Cu matrix and no casting defects are observed. Moreover, wear resistance of these Cu-based composites are much better than pure Cu, and the frictional coefficient between these composites and bearing steel as the counter part is reduced by dispersion of the graphite particles. Furthermore, it is found that the optimum area fraction of the graphite particles to improve the wear resistance of the present Cu-based composite is from 15% to 21%.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 1579-1584
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.1579
• Online since: May 2014
• Authors: Hisashi Sato*, Wei Wei, Kazuaki Oguri, Motoko Yamada, Yoshimi Watanabe
• Keywords: Centrifugal Casting, Cu-Based Composite, Graphite, Self-Lubrication, Wear

References

[1] A. Wang and H. J. Rack, A statistical model for sliding wear of metals in metal/composite systems, Acta Metall. Mater. 40 (1992) 2301-2305.

DOI: 10.1016/0956-7151(92)90148-8

[2] P. K. Rohatgi, S. Ray, Y. Liu, Tribological properties of metal matrix-graphite particle composites, Int. Mater. Rev. 37 (1992) 129-152.

DOI: 10.1179/imr.1992.37.1.129

[3] G. Goller, D. P. Koty, S. N. Tewari, M. Singh and A. Tekin, Wear and friction behavior of metal impregnated microporous carbon composites, Metall. Mater. Trans A 27A (1996) 3727-3738.

DOI: 10.1007/bf02595464

[4] Y. Zhan, G. Zhang, and Y. Zhuang, Wear transitions in particulate reinforced copper matrix composites, Mater. Trans. 45 (2004) 2332-2338.

DOI: 10.2320/matertrans.45.2332

[5] J. Kováčik, Š. Emmer, J. Bielek and L'ubomír Kelešic, Effect of composition on friction coefficient of Cu–graphite composites, Wear 265 (2008) 417-421.

DOI: 10.1016/j.wear.2007.11.012

[6] H. Sato, E. Miura-Fujiwara, and Y. Watanabe, Effects of dispersoids on wear behavior of Cu-based nanocomposite containing SiO2 nanoparticles, Jpn. J. Appl. Phys. 51 (2012) 01AK01 (7pages).

DOI: 10.7567/jjap.51.01ak01

[7] C. P. Samal, J. S. Parihar and D. Chaira, The effect of milling and sintering techniques on mechanical properties of Cu–graphite metal matrix composite prepared by powder metallurgy route, J. Alloys Compd. 569 (2013) 95-101.

DOI: 10.1016/j.jallcom.2013.03.122

[8] M. Koizumi and K. Urabe, Functionally graded composites, Tetsu-to-Hagane, 75 (1989) 887-893.

[9] Y. Watanabe, Y. Inaguma , H. Sato and E. Miura-Fujiwara, A novel fabrication method for functionally graded materials under centrifugal force: The centrifugal mixed-powder method, Materials 2 (2009) 2510-2525.

DOI: 10.3390/ma2042510