Protection of components from corrosion

A multilayered coating structure, comprising:

• a structure comprising a superalloy, wherein the structure has an outside surface comprising a plurality of apertures, and wherein a plurality of internal gas passages are disposed through the structure;
• a thermal barrier coating (TBC) layer disposed over the outside surface of the structure;
• a metal oxide layer formed via atomic layer deposition on the TBC layer, wherein the metal oxide layer comprises a rare earth metal, aluminum, zirconium, chromium, or combinations thereof;
• a toughness enhancing layer comprising doped yttrium stabilized zirconium (YSZ) and in direct contact with the TBC layer, wherein the toughness enhancing layer has a thickness of about 5 microns to about 50 microns;
• and
• a damage sensing layer comprising doped yttrium aluminum garnet (YAG) or doped YSZ and in direct contact with the toughness enhancing layer.

A multilayered coating structure, comprising:

• a structure comprising a superalloy, wherein the structure has an outside surface comprising a plurality of apertures, and wherein a plurality of internal gas passages are disposed through the structure;
• a thermal barrier coating (TBC) layer comprising Gd-zirconates (GZO) disposed over the outside surface of the structure;
• a metal oxide layer formed via atomic layer deposition on the TBC layer, wherein the metal oxide layer comprises a rare earth metal, aluminum, zirconium, chromium, or combinations thereof;
• a toughness enhancing layer comprising doped yttrium stabilized zirconium (YSZ), wherein the toughness enhancing layer has a thickness of about 5 microns to about 50 microns, and wherein the toughness enhancing layer is in direct contact with the TBC layer;
• and
• a damage sensing layer comprising doped yttrium aluminum garnet (YAG) or doped YSZ, which comprises one or more rare earth metal dopants selected from europium, terbium, or dysprosium, wherein the damage sensing layer is in direct contact with the toughness enhancing layer.

A multilayered coating structure, comprising:

• a structure comprising a superalloy, wherein the structure has an outside surface comprising a plurality of apertures, and wherein a plurality of internal gas passages are disposed through the structure;
• a thermal barrier coating (TBC) layer disposed over the outside surface of the structure;
• a metal oxide layer formed via atomic layer deposition on the TBC layer, wherein the metal oxide layer comprises a rare earth metal, aluminum, zirconium, chromium, or combinations thereof;
• a toughness enhancing layer comprising doped yttrium stabilized zirconium (YSZ) and in direct contact with the TBC layer;
• a damage sensing layer comprising doped yttrium aluminum garnet (YAG) or doped YSZ and in direct contact with the toughness enhancing layer;
• and
• an infrared (IR) reflector layer comprising a ceramic and in direct contact with the damage sensing layer.