The tribological behavior of Al2O3/TiO2 and WC/Co plasma-sprayed coatings w
as studied under dry sliding conditions. X-ray photoelectron spectroscopic
analyses have shown the presence of graphite in WC/17 wt% Co coatings and a
thin WO3 layer in the contact. These phases could explain the improvement
in the friction behavior of the cermet/ceramic couples versus the ceramic/c
eramic couples. (C) 1999 Elsevier Science S.A. All rights reserved.