Abstract
Thermal barrier coatings (TBC) is indispensable technique for advanced gas turbines. However, thermally grown oxide (TGO) is formed at the interface between top coating (TC) and bond coating (BC) of the TBC in a high temperature environment, and the TGO can induce delamination or spallation of the TBC. By Cerium (Ce) addition to conventional CoNiCrA1Y bond coat material, a wedge-like TGO is formed in a high temperature environment and improve delamination resistant properties drastically. In this study, several kind of TBC specimens with Ce added BCs, which exposed to 1100℃ in air for several exposure times, were prepared. Moreover, four-point bending tests were carried out under tensile and compressive loading conditions for TBC. In the case of tensile loading, delamination resistance property of TBC specimens with Ce added BCs were obviously higher than that of the TBC with conventional BC, and the delamination resistance property of TBC specimens with Ce added BCs were maintained up to 500 hours exposure. In the case of compressive loading, TBC specimens with Ce added BCs showed almost same strength as the TBC specimen with conventional BC.
