Characterization of functionally graded ZrO₂ thermal barrier coatings sprayed by supersonic plasma spray with dual powder feed ports

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ÎÄÕÂÒ³Â룺257 - 260

Key words£ºsupersonic plasma spray (S-PS)£» dual powder feed ports£» functionally graded thermal barrier coatings (FG-TBCs)£» thermal shock

Abstract: The functionally graded thermal barrier coatings £¨FG-TBCs£© with 80%ZrO₂-13%CeO₂-7%Y₂O₃ £¨C-YSZ£©/NiCoCrAlY were prepared using a recently developed supersonic plasma spraying£¨S-PS£© with dual powder feed ports system. The thermal shock experiment of FG-TBCs specimens was carried out by means of the automatic thermal cycle device, in which the samples were heated to 1¤@200¤@¡æ by oxygen-acetylene flame jet then water-quenched to ambient temperature. The temperature¡ªtime curves of specimens and photographs can be watched on-line and recorded by a computer during the test. The results show that the totally 1¤@mm-thick FG-TBCs have excellent thermal shock resistance due to the fact that the coatings have no any peeling-off after 200 thermal cycles. The microstructures and morphologies of FG-TBCs were characterized and analyzed by SEM.