EAP - Proceedings of the Estonian Academy of Sciences

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SINCE 1952

proceedings
of the estonian academy of sciences

ISSN 1736-7530 (Electronic)
ISSN 1736-6046 (Print)

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Comparison of the wear and frictional properties of Cu matrix composites prepared by pulsed electric current sintering; pp. 62–74

PDF | doi: 10.3176/proc.2014.1.09

Authors

Riina Ritasalo, Maksim Antonov, Renno Veinthal, Simo-Pekka Hannula

Abstract

Wear performance of Cu matrix composites prepared by pulsed electric current sintering (PECS) was evaluated by using non-lubricated sliding tests. The studied materials contained cuprite (Cu₂O), alumina (Al₂O₃), titaniumdiboride (TiB₂) or diamond dispersoids in a coarse-grained Cu (c-Cu), submicron-grained Cu (sm-Cu), or nano-grained Cu (nCu) matrix. PECS compacted matrix materials were used as references. The ball-on-flat tests showed strong dependence of the coefficient of friction (CoF), wear rate and wear mechanism on the counter ball material. Cr-steel balls led to high CoF (0.71–1.01) and high wear rate (1.3 x 10^–5–5.7 x 10^–3 mm³/Nm) depending on the test material and its reactivity with the counterpart. Cu-Cu₂O yielded to lowest CoF and wear rate with a presence of oxidational and abrasive wear, whereas, Cu-Al₂O₃ and Cu-diamond suffered of adhesive wear leading to much higher wear rates. On the other hand, alumina ceramic counterpart led to a considerably lower CoF (0.39–0.92) and wear rate (1.4 x 10^–7–6.1 x 10^–6 [mm³/Nm]), and the test materials showed oxidational wear and material pile-up. Of the composites, Cu-diamond showed the lowest wear rate and Cu-Cu₂O and Cu-diamond (5 nm) showed the lowest CoF against alumina. It is believed that the present work gives new insights for materials selection, e.g., in electronic connector parts.

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