High Temperature Friction of Ceramic and Cermet Coatings.

The purpose of this study is the tribological analysis of coating materials containing basically ceramics and cermets, which can be sintered or sprayed. The materials studied were -69 TiC 31 Ni - 80 Cr7C3 20 NiCr -25 WC 5 Ni - 70 WCr - Cr 202 - Al203 - x Cr203 100-x Al203. The tests were conducted by means of two high temperature tribometers, one working in a vacuum, and the other in air. The contact pressure was 1 Nsq mm and the friction speed 5 mmn. These conditions permitted us to disregard friction-induced temperature phenomena. During each test, the normal load, the tangential load and the temperature were continuously recorded. After each test, other measurements were made, according to the requirements of the study, by using methods such as - density measurements wear coefficient measurements using profilometry methods hardness and microhardness micrography roughness X-Rays microscan electronic microscope.