Abstract
The tribological behavior of self-mated ceramic composites, like SiC-TiC, Si3N4-TiN and (Ti, Mo) (C, N)+Ni, were characterized under dry-sliding friction. The coefficient of friction still remains unchanged on a level known from SiC and Si3N4 ceramics. The addition of titanium compounds to SiC and Si3N4 ceramics reduced the wear rate compared to titanium-free ceramics. Increasing sliding speed and temperature enhances this trend. The (Ti, Mo) (C, N) materials exhibited a wear behavior nearly independent from sliding speed and temperature with wear rates lower than 10−7 mm3/Nm up to 800°C. The present study utilized small-spot X-ray diffraction, laser raman spectroscopy (LRS) and transmission electron microscopy (TEM) TiO2 and TinO2n·1,-type crystalline Magneli-phases with a crystallographic shear structure as well as some double oxides like NiTiO3, Mo0.975Ti0.025O2 and β-NiMoO4, were detected on different ceramic substrates formed by tribo-oxidation during tests at 400°C and 800°C. The conditions during tribological operation are sufficient to generate crystalline Magneli-phases by tribo-oxidation, like γ -Ti3O5, Ti5O9 and Ti9O17.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
