Mechanical and tribological behavior of nanostructured copper-alumina cermets obtained by Pulsed Electric Current Sintering

作者：Eddine Wassim Zein^*; Matteazzi Paolo; Celis Jean Pierre

来源：Wear, 2013, 297(1-2): 762-773.

DOI：10.1016/j.wear.2012.10.011

• Nanostructured copper-alumina
• Pulsed electric current sintering
• Dispersion strengthening
• Tribology
• Mild oxidational wear
• Sub-surface deformation

Nanostructured Cu-Al2O3 powders obtained by the reduction of CuO with Al in a high energy ball mill were successfully consolidated by Pulsed Electric Current Sintering (PECS). The effect of the composition and microstructure of these PECS Cu-Al2O3 cermets on their strength was investigated. The friction and wear behavior of these cermets were studied under reciprocating sliding against corundum at 23 degrees C and 50% RH, and compared to the behavior of coarse grained PECS sintered pure copper. The effect of grain size on the coefficient of friction was masked by the formation of a surface tribolayer. The wear depth recorded on Cu-Al2O3 is lesser than half the one on coarse grained copper. Surface and subsurface deformation studied through FIB cross-sections showed that delamination and oxidative wear were active on Cu and Cu-Al2O3 cermets respectively under the current sliding test conditions. PECS Cu-Al2O3 cermets showed a good thermal stability even at 600 degrees C.

• 出版日期2013-1-15