Materials engineering for anti-coking coating stacks

A method for depositing a protective coating on an aerospace component, comprising:

• depositing a barrier layer on a surface of the aerospace component, wherein the barrier layer comprises a metal oxide selected from chromium oxide, tungsten oxide, titanium oxide, vanadium oxide, alloys thereof, or any combination thereof;
• and
• depositing a carbon oxidation catalyst layer on the barrier layer, wherein the carbon oxidation catalyst layer comprises a cerium oxide and a dopant;
• wherein:
• the aerospace component is a fuel nozzle, a combustor liner, a combustor shield, a heat exchanger, a fuel line, a fuel valve, or any combination thereof;
• and
• the surface of the aerospace component is an interior surface of the aerospace component and the interior surface has an aspect ratio of greater than 10 to about 1,000.

An aerospace component, comprising:

• a protective coating disposed on a surface of the aerospace component, wherein the protective coating comprises:
• a barrier layer disposed on the surface of the aerospace component;
• and
• a carbon oxidation catalyst layer comprising cerium oxide or doped cerium oxide disposed on the barrier layer.