In the last decade in a number of machine building industries ever wider use is being made of constructional materials based on nonmetallic refractory compounds (as a rule nitrides). A combination of high mechanical strength and wear and heat resistance with low density and stability of the properties in a broad temperature range makes it possible to use nitride ceramics in critical rubbing pairs including sliding bearings subjected to intense static and dynamic loading and also to high-temperature action [i, 2].