Patent ID: 7858205

Claim:
A bimetallic bond layer for a thermal barrier coating on a superalloy component, comprising: a superalloy substrate; an interlayer on the substrate; a bond coat comprising a CoNiCrAlY or NiCoCrAlY alloy on the interlayer; the interlayer comprising an alloy that blocks or delays diffusion of aluminum from the bond coat into the substrate at an operating temperature over 900° C. via the formation of one or more intermetallic precipitate phases in the interlayer; and a ceramic thermal barrier coating on the bond coat; wherein the interlayer comprises a nickel base, at most about 1.75 wt % titanium, at least about 8 wt % chromium, at least about 0.2 wt % aluminum, and at least one element selected from Nd 0.1 to 3 wt %, Re 0.2 to 1.5 wt %, and Hf 0.1-2.0 wt %; wherein the interlayer comprises a Haynes 230 alloy with addition of said at least one element; and wherein the substrate comprises an IN-939 alloy, and the ceramic thermal barrier coating comprises porous yttrium stabilized zirconia.