Thermal barrier coating system compatible with overlay
Materials and a process for forming a protective oxide coating. The high temperature coating system ( 108 ) includes at least a thermal barrier coating layer ( 104 ) and a thermally stable, deposit resistant protective layer ( 106 ) on the thermal barrier coating layer ( 104 ).
1. A high temperature coating system comprising:
a thermal barrier coating layer comprising a yttria-stabilized zirconia and a columnar microstructure; and
a thermally stable, deposit resistant protective layer on the thermal barrier coating layer,
wherein the thermally stable, deposit resistant protective layer material is pure forsterite or doped forsterite.
2. The coating system according to claim 1 , wherein the deposit is a composition of oxides of calcium, magnesium, aluminum, silicon, titanium, and mixtures thereof (CMAS), an oxide rich in nickel and/or iron or a combination.
3. A component, comprising:
a substrate;
a thermal barrier coating layer on the substrate, the thermal barrier coating layer comprising a yttria-stabilized zirconia and a columnar microstructure; and
a thermally stable, deposit resistant protective layer on the thermal barrier coating layer,
wherein the thermally stable, deposit resistant protective layer material is pure forsterite or doped forsterite.
4. The component according to claim 3 , wherein the deposit is a composition of oxides of calcium, magnesium, aluminum, silicon, titanium, and mixtures thereof (CMAS), an oxide rich in nickel and/or iron or a combination.
5. The component according to claim 3 , wherein the component comprises a gas turbine rotor blade.
6. The component according to claim 3 , wherein the component comprises a gas turbine stationary guide vane.