As the nefractory materials of gas turbine parts, nickel-chromium base, nickel base and cobalt base super alloys are briefly abstracted. Ceramic coating increases life of engine exhaust but the value of ceramios or cerametalics are unknown to date. Nitrides and carbides of II, III and IV groups of atoms in periodic tables are studied with this object by powder metargy, and it seems that the mixture of 80% TiC and 15_??_20% of nickel or cobalt known as Kentaniam is one of champions in to-morrow.
