What is the consequence of coating delamination in hot-section components?

• A. Increased engine thrust.
• B. Improved corrosion resistance.
• C. Reduced heat protection and shorter component life.
• D. No effect.

Answer: (C)

Thermal barrier coatings on hot-section components act as a heat shield, lowering the metal surface temperature and slowing oxidation. When the coating delaminates, it separates from the substrate, breaking that protective barrier. With the coating no longer firmly attached, heat transfers more readily into the underlying metal, causing higher temperatures, accelerated oxidation, and thermal damage. This loss of heat protection directly shortens component life because the metal experiences greater thermal stress and faster degradation. It won’t increase engine thrust, and it doesn’t improve corrosion resistance; those outcomes don’t align with what delamination does, and the effect is not negligible.