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Thermal Cycling Behavior of Air Plasma-Sprayed and Low-Pressure Plasma-Sprayed Environmental Barrier Coatings
| Content Provider | MDPI |
|---|---|
| Author | Chen, Dianying Pegler, Aaron Dwivedi, Gopal Wet, Daniel De Dorfman, Mitchell |
| Copyright Year | 2021 |
| Description | $Yb_{2}Si_{2}O_{7}$/Si environmental barrier coatings (EBCs) were produced by air plasma spray (APS) and low-pressure plasma spray (LPPS) processes. The phase composition, microstructure, and bonding strength of APS and LPPS EBCs were investigated. Thermal cycling tests were performed in air and in steam atmosphere respectively at 1316 °C for both APS and LPPS EBCs. There is no coating failure in air atmosphere for both APS and LPPS EBCs after 900 cycles. In contrast, APS EBCs have an average life of 576 cycles in a steam cycling test in 90% $H_{2}$O + 10% air at 1316 °C while LPPS EBCs survived 1000 cycles without failure. The superior durability of the LPPS EBCs compared to APS EBCs in the same steam cycling environment is attributed to the significantly reduced thermally grown oxide (TGO) growth rate because of the denser and crack-free microstructure, higher bonding strength, and reduced coefficient of thermal expansion (CTE) mismatch (less $Yb_{2}SiO_{5}$ phase) in the LPPS $Yb_{2}Si_{2}O_{7}$/Si EBCs. |
| Starting Page | 868 |
| e-ISSN | 20796412 |
| DOI | 10.3390/coatings11070868 |
| Journal | Coatings |
| Issue Number | 7 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-07-20 |
| Access Restriction | Open |
| Subject Keyword | Coatings Environmental Engineering Yb2si2o7 Environmental Barrier Coatings Air Plasma Spray Low-pressure Plasma Spray Thermal Cycling Thermally Grown Oxide (tgo) |
| Content Type | Text |
| Resource Type | Article |
