Tribological Parameters of Copper-Alumina Composite

Abstract:

Basic mechanical and wear properties of a commercial copper based composite Glidcop were studied. A Glidcop AL-60 grade (with 1.1 wt.% Al2O3) was used as the initial material. It was further treated by the Equal Channel Angular Pressing (ECAP) process in order to induce massive plastic deformation and to achieve very fine grained microstructure. Both, as-received and ECAP-ed materials were then characterized and the results compared. Hardness and elasticity modulus of the experimental materials were measured by instrumented indentation. Tribological properties were studied by pin-on-disk technique in dry sliding against a steel ball at a various temperatures from room temperature up to 600 °C. For all systems the coefficient of friction and specific wear rates were evaluated. Worn surfaces were studied by scanning electron microscopy and level of oxidation was measured using EDX spectrometry. It was found that above 200 °C the coefficient of friction decreased by about 50 %. The wear resistance with increasing temperature increased due to formation of harder oxide rich surface layer. Damage mechanisms were identified and their relationship with structural characteristics was inferred.

• Periodical: Key Engineering Materials (Volume 527)
• Pages: 191-196
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.527.191
• Online since: November 2012
• Authors: Pavol Hvizdoš, Priit Kulu, Michal Besterci
• Keywords: Al₂O₃, Copper, Damage Mechanisms, ECAP, Wear

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