A CO 2 continuous wave laser with BIZ transmissive beam integrators was used for laser remelting(LR) the surface of plasma sprayed(PS) ZrO 2-8wt pct Y 2O 3(8YSZ)/Ni22Cr10A1Y thermal barrier coatings (TBCs) on GH536 superalloy substrate.The uniform energy distribution of beam with rectangular profiles of 9mm×3mm was obtained.The thermal shock tests were conducted to both PS samples and LR samples at 1050℃.With the different failure criterions,the mechanism of failure was discussed.It was indicated that t...