Isothermal oxidation behavior and kinetics of thermal barrier coatings produced by cold gas dynamic spray technique

Abstract

The cold gas dynamic spray (CGDS) method was employed to deposit the CoNiCrAIY bond coats of thermal barrier coating (TBC) system. The oxidation behavior of the coatings were investigated under isothermal oxidation at 1000 degrees C, 1100 degrees C and 1200 degrees C for 8, 24, 50 and 100 h. Recent studies on TBCs have concentrated on the CGDS process and its properties under working conditions. The motivation of this study is to investigate the oxidation behavior of TBCs produced using CGDS technique under service conditions and to determine the oxidation growth kinetics of thermally grown oxide (TGO). The results show that the isothermal degradation of coatings was considerably influenced by microstructure of coating, interfacial oxide growth rate, oxidation temperature and time. (C) 2016 Elsevier B.V. All rights reserved.