Thermal barrier coating

摘要

A ceramic thermal barrier coating on a substrate wherein the coating comprises primary columnar grains that extend transversely of a surface of the substrate and that include integral secondary columnar grains extending laterally therefrom relative to a respective column axis. The secondary columnar grains typically extend from the primary columnar grains at an acute angle of less than 90 degrees relative to the column axis of the primary columnar grains. The coating structure exhibits reduced thermal conductivity as compared to a conventional thermal barrier coating.