Friction and Wear Behavior of NiAl-Cr(Mo)-CrxSy Self-lubricating Composite

The wear behaviors of NiAl-Cr(Mo)-CrxSy self-lubricating composite against SiC ceramic under dry sliding in tented temperature range from 110 to 960 ℃ were investigated on a pin-on-disc test rig. The results reveal that between 200℃ and 400℃, CrxSy-type eutectic compound form a relatively intact lubricant film composed of nano-CrxSy-type eutectic compound overlays the friction surface. The composite exhibit excellent permanent self-lubricating properties in the temperature range of 200~400℃. The composite exhibit excellent permanent self-lubricating properties and better anti-wear properties in the temperature range of 700~900℃, that is attributed to the formation of glass-ceramic lubricant film with the thickness of 1~3 μm. Wear type of tested materials/SiC is eliminated, which is lead by the transfer the lubricant film to the surface of SiC. With the increasing of tested temperature the friction coefficient and wear rate become higher, which contribute to the decreasing of strength and the spallation owing to the incursion SiC particles for the self-lubricant film.