High-energy X-ray phase analysis of CMAS-infiltrated 7YSZ thermal barrier coatings: Effect of time and temperature

Stein, Zachary; Kenesei, Peter; Park, Jun-Sang; Almer, Jonathan; Naraparaju, Ravisankar; Schulz, Uwe; Raghavan, Seetha

doi:10.1557/jmr.2020.212

High-energy X-ray phase analysis of CMAS-infiltrated 7YSZ thermal barrier coatings: Effect of time and temperature

Journal Article · Fri Aug 28 00:00:00 EDT 2020 · Journal of Materials Research

DOI:https://doi.org/10.1557/jmr.2020.212· OSTI ID:1757973

Stein, Zachary ^[1]; Kenesei, Peter ^[2]; Park, Jun-Sang ^[2]; Almer, Jonathan ^[2]; Naraparaju, Ravisankar ^[3]; Schulz, Uwe ^[3]; ^[1]

Univ. of Central Florida, Orlando, FL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
German Aerospace Centre (DLR), Cologne (Germany)

Calcium–magnesium–alumino-silicate (CMAS) particulates enter the aero-engine in a sandy environment, melt and infiltrate into 7 wt% yttria-stabilized zirconia (7YSZ) thermal barrier coatings (TBCs), reducing their lifetime. This leads to chemical degradation in 7YSZ accompanied by tetragonal to monoclinic phase transformation upon cooling. In this work, electron-beam physical vapor deposition coatings were infiltrated with a synthetic CMAS. Here, synchrotron X-ray diffraction measurements show that CMAS infiltration at 1250 °C has about 43% higher monoclinic phase volume fraction (PVF) at the coating surface compared to 1225 °C and remains consistently higher throughout the coating depth. Additionally, the increase in annealing time from 1 to 10 h results in a 31% higher monoclinic phase at the surface. Scanning electron microscopy revealed the presence of globular monoclinic phases corresponding spatially with the above findings. These results resolve the impact of time and temperature on CMAS infiltration kinetics which is important for mitigation.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1757973

Journal Information:: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 17 Vol. 35; ISSN 0884-2914

Publisher:: Materials Research SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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