Microstructure and thermal shock resistance of the peg-nail structured TBCs treated by selective laser modification

The surface of the discrete peg-nail structured laser modified units shows resolidification with network segmented cracks perpendicular to the surface and columnar grains on the surface. The interface between top coating and bond coating exhibits a metallurgical bond to some degree after the peg-nail structured laser modification. It can be noted that lifetime of the peg-nail structured laser modified coatings, relative to that of the as-sprayed coating, exhibit 3-5 improvement.