The invention provides an improved thermal barrier coating system for a hot section component (10). The thermal barrier coating has a metallic bond coat (12) and a ceramic top coat made of two constituents. The top coat is formed so that there is provided a graded interface (16) between the monolithic layers (14, 18) of the two top coat constituents. This allows an increase in overall thickness of the thermal barrier coating which provides a higher thermal insulation for the component (10) being protected.
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