Effects of solid lubricant content and size on the tribology ofNiCr-Cr2O3-Agcomposites

Abstract

The tribological behavior of NiCr-Cr2O3 blended powder containing solid lubricants Ag and/or BaF2/CaF2 eutectic was evaluated according to the content and particle size of solid lubricant and wear temperature. A spark plasma sintering (SPS) process was used to produce bulk wear specimens. The wear tests were carried out with a pin-on-disk type instrument under dry sliding conditions. Friction coefficient, wear loss and content of transferred tribofilm were evaluated. The friction coefficient decreased with an increase of Ag content and the effect of decreasing Ag size was compatible to that of increasing Ag content.