Abstract: This paper emphasizes the effect of electron beam physical vapor deposition ( EB-PVD) thermal barriercoatings on the diameters of the punctures by laser puncturing. The specimens were initially punctured with differentpunctures in diameter and direction by the laser puncturing method and then deposited with MCrAlY bond coat andZrO₂ ceramic topcoat by means of EB-PVD. Thereafter, the changes of the pores were evaluated. It is found that theangles of incidence of the pores have little influence on the diameters of the punctures. The bigger the original punctures, the smaller the relative changes of punctures after being coated with thermal barrier coatings. The diametersof the punctures coated with the EB2PVD ZrO₂ ceramic topcoat were decreased by approximately 15 % comparedwith those of the original punctures. The results show that the changes of punctures in diameter can be ignored after100 thermal circles.

Key words: EB PVD, thermal barrier coatings, the cooling punctu res, thermal circles