| abstract |
A coating system 102 disposed on a surface 115 of a substrate 120 is provided. The coating system may include a bond coating layer 140 on the surface of the substrate, a dense TBC layer 145 on the bond coating layer, and a columnar TBC layer 110 on the dense TBC layer, with the columnar TBC layer defines a plurality of elongated surface-connected voids 130. The dense TBC layer generally includes a ceramic material and has a porosity of about 15% or less. A method is also provided for forming a coating system on a surface of a substrate. |