Effect of top coat porosity on the oxygen diffusion and oxidation in thermal barrier coating systems

Key Points

• Higher top coat porosity significantly increases oxygen diffusion rates, enhancing oxidation.
• Oxygen diffusion was found to vary markedly with porosity levels in thermal barrier coatings.
• Analysis of thermal barrier coating systems revealed distinct oxidation effects linked to porosity.
• Understanding porosity's role may enable improved design of thermal barrier coatings for better performance.