THERMAL BARRIER COATING WITH LOW THERMAL CONDUCTIVITY

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PROBLEM TO BE SOLVED : To provide an article having superalloy substrates with thermal barrier coatings. SOLUTION : This invention relates to an article 10. The article 10 comprises a superalloy substrate 14 that is disposed with a bond coating 16 and a thermal barrier coating 20. The thermal barrier coating 20 is disposed on the bond coating 16 and comprises an inner ceramic layer 22 and an outer ceramic layer 24. The outer ceramic layer 24 comprises a material having a composition represented by formula I. (alkaline earth metal)x(rare earth metal)y(Zr, Hf, Ti)zOδ(I). In the formula I, x>0, y>0, z>0, δ>0 and [y/(x+y+z)]≥0.28. The composition of the formula I has the cubic fluorite structure. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2019, JPO&INPIT