| Environmental barrier coatings on SiC without a silicon bond coating: oxidation resistance, failure modes, and future improvements |
Mackenzie Ridley1
, Kenneth Kane2, Bruce Pint1 |
1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
2The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA |
|
|
|
Received: November 2, 2023; Revised: January 24, 2024 Accepted: March 2, 2024. Published online: May 31, 2024. |
|
|
|
| ABSTRACT |
|
Environmental barrier coatings (EBCs) are used to mitigate chemical reactions between SiC ceramic matrix composite (CMC) components and the H2O in combustion gas in turbine hot sections. CMCs are currently temperature-limited by the Si-bond coating, which melts at ~ 1414 °C. This work explores EBCs where the bond coating was removed to achieve higher operating temperatures. Various versions of enhanced roughness SiC were utilized to improve EBC adhesion to the substrates prior to 1 h furnace cycle testing in steam at 1250–1425 °C. The enhanced SiC roughness resulted in short coating lifetimes as the roughness was oxidized away with SiO2 formation. Further, isothermal furnace exposures at 1400–1600 °C showed Yb2Si2O7/Yb2SiO5 EBC microstructural changes, resulting in premature debonding from the substrates. This work provides baseline requirements for the development of both next-generation EBCs and bond coating strategies to overcome the current limitation of the Si-bond coating melting temperature. |
| Key words:
Environmental barrier coating · Oxidation · Adhesion |
|
|
|
PDF Links 
Full text via DOI
Download Citation 
