Patent ID: 7758968

Claim:
A gas or steam turbine component suitable for use at temperatures up to 850° C., comprising: a base component; a ceramic thermal barrier coating applied to the base component; an intermediate protective MCrA1X layer arranged beneath the thermal barrier coating, where M is at least one element selected from the group consisting of nickel, cobalt and iron, and X is yttrium or silicon or at least one rare earth element; and a metallic erosion-resistant layer applied to the thermal barrier coating, the erosion resistant layer having a lower porosity than the thermal barrier coating, wherein the intermediate protective layer consists of: 11.5 wt % to 20 wt % chromium, 0.3 wt % to 1.5 wt % silicon, 0 wt % to 1 wt % aluminum, 0 to 4 wt % yttrium, and remainder iron.