Effects of production parameters on the electrical resistivity of Cu/M₇C₃-M₂₃C₆ MMCs

In this study, the effects of production parameters on the electrical conductivity of the electrofriction material (Cu/M₇C₃-M₂₃C₆) for collectors have been investigated. For this reason; copper and FeCr powders (M₇C₃-M₂₃C₆) were mixed in a mixer in ratios of 5, 10, 15, 20, 30 and 40 wt.% FeCr for 3 h. The pressure was applied as 380, 635, 955 MPa to produce samples having 5 mm radius and 1 mm thickness. Also temperature was changed as 700, 800, 900 °C during sintering. After sintering, electrical resistivity measurements, metaleographic investigations and energy dispersive spectrometry (EDS) analysis of the samples have been taken. Finally, it was detected that electrical resistivity was decreased by increasing sintering temperature and compression pressure, and increased depending on additive (FeCr particulates) amount.