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Tribological properties of Brass-graphitecomposite

Published online by Cambridge University Press:  02 May 2014

Zohair Sarajan
Zohair Sarajan*
Affiliation:
Department of Materials Science and Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran Safaeeyeh, P.O.Box:89195/155. e-mail: zohairsarajan@iauyazd.ac.ir, zohairsarajan@yahoo.com
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Abstract

Brass-graphite composites were fabricated by adding graphite/Cu/Zn compact powderusingthe stir-casting technique and their tribological behavior against a brass disk wasstudied under simulated actual conditions, in comparison with the common graphite/brasscomposite The tribological properties of the brass-graphite composite were compared withdifferent percentages of graphite in the structure using the pin-on-disk method. Theexperimental results showed that the 7−9 wt.% graphite creates a better wear resistance in high-pressureapplications. Continuous Zn layers successfully covered the surface of the graphiteparticles, which could contribute to the improvement of interfacial wettability betweengraphite and brass. In this study, brass-graphite composites containing 8.4 ~ 15 wt.% of Ni-coated graphitewere fabricated. The friction coefficient of composites decreased with increasing graphitecontent. The wear resistance was improved by the addition of Ni-coated graphite butdegraded at high graphite content. The results indicated this composite showed much bettermechanical properties and tribological properties in comparison with brass. The compositewith 11.7 wt.% nickel-coated graphite showed the best tribological properties.

Keywords

Brass/graphitecompositetribologicalself-lubricating
Type
Research Article
Information
Metallurgical Research & Technology , Volume 111 , Issue 2 , 2014 , pp. 85 - 93
Copyright
© EDP Sciences 2014

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