High Temperature Lubricating Behavior of NiAl Matrix Composites With Addition of CuO.

High temperature self-lubricating NiAl matrix composites with addition of CuO (15, 20, and 25wt.%) were fabricated by powder metallurgy technique, and the tribological behavior from room temperature to 1000°C was investigated. It was found that Ni-Cu and Al20 3 phases formed during the fabrication process due to reaction of NiAl and CuO. The tribological results showed that the composite with addition of 25wt.% CuO has a favorable friction coefficient of about 0.2 and excellent wear resistance with the magnitude of 10^-6 mm³ N^-1 m^-1 at high temperatures (800 and 1000°C). [ABSTRACT FROM AUTHOR]