Evaluation and Characterization of a Durable Composite Phase Thermal Barrier Coating in Solid Particle Erosion and Burne
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Evaluation and Characterization of a Durable Composite Phase Thermal Barrier Coating in Solid Particle Erosion and Burner Rig Tests Xinqing Ma1 • Kristina Rivellini1 • Peter Ruggiero1 • George Wildridge2
Submitted: 22 June 2020 / in revised form: 4 August 2020 / Accepted: 11 September 2020 ASM International 2020
Abstract A new concept of composite phase ceramic had been proposed for the topcoat of a durable thermal barrier coating (TBC) system which is one of the critical technologies for advanced turbine engines. The composite phase TBCs showed promising performance related benefits over conventional single phase TBCs, including durability, material affordability, thermal stability and low thermal conductivity. The present work is to continue the effort to exploring the TBC behaviors of erosive wear by solid particle erosion test and thermal cyclic shock by special burner rig test. In the erosion test, the investigation was focused on the most important characteristics of erosion test results using different characterization methods, including the variations of erosion damages with impingement angle and finally the effect of high temperature sintering. In the burner rig test, the TBC was exposed to a rapidly thermal cycling condition introduced by a high heat flux and high-velocity combustion torch. The TBC damages and failure modes were identified and explained in terms of microstructural observation and mechanism discussion. The composite phase c ? t0 TBC demonstrated improved erosion resistance relative to a Gd2Zr2O7 TBC
This article is an invited paper selected from abstracts submitted for the 2020 International Thermal Spray Conference, ITSC2020 that was to be held from June 10-12, 2020, in Vienna, Austria. The conference was cancelled due to the coronavirus (COVID-19) pandemic. The paper has been expanded from the planned presentation. & Xinqing Ma [email protected] 1
Surface Technologies Division, Curtiss-Wright Corporation, East Windsor, CT, USA
2
IMR Test Labs, Curtiss-Wright Corporation, Lansing, NY, USA
and equivalent thermal shock resistance to a conventional 8YSZ TBC. Keywords air plasma spray burner rig test coating characterization erosion test thermal barrier coating
Introduction Thermal barrier coatings (TBCs) have been widely applied to the surfaces of components in various high temperature environments, not limited to the critical turbine engine parts such as combustion liners, fuel nozzles, blades and vanes in turbine hot sections (Ref 1-3). Advanced TBCs will allow higher inlet temperatures for improved engine efficiency and extended lifetime. Therefore, it is necessary to develop optimal materials and offer the best possible solutions to meet the demands for advanced TBCs (Ref 46). In authors’ previous work, a composite phase ceramic was designed, optimized and tested for the topcoat in a TBC, and the test results of oxidation, thermal shock and thermal stability are very promising in comparison to a regular 8YSZ TBC and also a zirconate-based TBC (Ref 7). Addi
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