The High Temperature Oxidation Behaviour of the Single Crystal Ni-Base alloy M002 Mod. With and Without Protective Coatings

Abstract

Turbine blades for advanced aero engines are produced increasingly from Nickel-base alloys in single crystal form. In comparison to polycrytalline blades, their improved creep strength allows a higher operating temperature. The surface temperature of turbine blades at the leading and trailing edge is sometimes in the range 1050 to 1100°C. Under these conditions, the surface attack by oxidation cannot be neglected, and protection by way of a suitable coating has to be provided. In principal, plain aluminide diffusion coatings, noble metal modified aluminides and MCrA1Y overlay coatings are available. However, for a specific application the oxidation resistance of a particular coating, in comparison to the uncoated base material, has to be tested under service-like conditions.