Thermal Barrier Coatings (TBCs) serve as thermal protection for various components in gas turbines. In line with the trend towards higher inlet temperatures and thus improved efficiencies, improved thermal shock properties are required. Laser post-treatments and laser hybrid spray processes were used to extend the service life with regard to thermal shock. These studies showed that laser-induced cracking increases resistance to thermal shock. However, the investigation of such modified layers requires special preparation techniques with regard to thermally induced stresses during embedding and preparation. In this article, fluorescent epoxy resins are used for vacuum infiltration. The relationship between the TBC microstructure and thermal shock resistance is further investigated. Paper includes a German-language abstract.