igen közben énis rájöttem, miközben a kezemben fogom az általad linkelt turbot és nemcsak a tengely hanem a turbina lapátok is bevonatosak  

Ceramic turbine. Conventional high-pressure turbine blades (and vanes) are made from nickel-steel alloys and often utilise intricate internal air-cooling passages to prevent the metal from melting. In recent years, experimental ceramic blades have been manufactured and tested in gas turbines, with a view to increasing Rotor Inlet Temperatures and/or, possibly, eliminating aircooling. Ceramic blades are more brittle than their metallic counterparts, and carry a greater risk of catastrophic blade failure.
(wikipedia)

Letezik ilyen, hogy keramia turbina, "allitolag" a T28 az R34 GT-R-en ilyen.    So they say...