Wear of thermal barrier coatings (TBCs) in a gas turbine environment is gradual which eventually leads to failure of the coated component if not detected and repaired. The goal of the present study is to understand the kinetics and mechanism of wear in reciprocating and erosive environments which is normally observed in gas turbine engines. Yttria stabilized zirconia (YSZ) based duplex and compositionally graded TBCs were manufactured using thermal spray techniques. Detailed characterizations of the coating (both the top surface and cross-section) were undertaken out to understand the microstructure and phase distribution in the coatings. The wear behavior of coated samples was evaluated by linear reciprocating wear against WC surface and compared with the uncoated Inconel 718. Erosion wear behavior of duplex and compositionally graded TBCs were also investigated at room temperature and 500 ºC. Presence of metallic phases and ceramic phases in the layer have shown to alter the mechanism of wear in erosion. Development of thermal residual stress have also resulted in altering the mechanism of erosive wear.
|Number of pages||27|
|Publication status||Unpublished - 2018|