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Adherent, thermal shock-resistant protective coatings for nickel base super alloys are obtained by applying to the base metal a thin bond coat of an alloy of chromium aluminum and yttrium with materials selected from the group consisting of iron, cobalt, nickel and nickel-cobalt and applying thereov

Adherent, thermal shock-resistant protective coatings for nickel base super alloys are obtained by applying to the base metal a thin bond coat of an alloy of chromium aluminum and yttrium with materials selected from the group consisting of iron, cobalt, nickel and nickel-cobalt and applying thereover a continuously graded mixture of this material with a zirconia-based ceramic, the concentration of zirconia-based ceramic increasing from the bond coat to the outer layer. The zirconia ceramic may be stabilized by the addition thereto of amounts of magnesium oxide or other materials.

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In a thermally protected superalloy structure which comprises a substrate of a material selected from the group consisting of nickel and cobalt-base superalloys, a metal bond coat on said substrate and an oxide stabilized zirconia-base ceramic thermal barrier coating on said bond coat, the improveme

In a thermally protected superalloy structure which comprises a substrate of a material selected from the group consisting of nickel and cobalt-base superalloys, a metal bond coat on said substrate and an oxide stabilized zirconia-base ceramic thermal barrier coating on said bond coat, the improvement wherein said bond coat is an alloy of chromium, aluminum and yttrium with a metal selected from the group consisting of iron, cobalt, nickel and a mixture of nickel and cobalt. A method of coating surfaces of nickel-base and cobalt-base alloys comprising: a. coating said surfaces with a bond coating consisting essentially of a material selected from the group consisting of NiCrAlY and CoCrAlY and mixtures thereof; and coating the coated surfaces formed in step (a) with a thermal barrier coating consisting essentially of an oxide stabilized zirconia.