TY  - JOUR
AU  - Bakan, Emine
AU  - Sohn, Yoo Jung
AU  - Vaßen, Robert
TI  - Metastable to stable phase transformation in atmospheric plasma sprayed Yb-silicate coating during post-heat treatment
JO  - Scripta materialia
VL  - 225
SN  - 1359-6462
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2022-05647
SP  - 115169 -
PY  - 2023
AB  - Yb-silicate is used as volatilization barrier material in environmental barrier coating applications. In this study, metastable to stable phase transformation in highly amorphous atmospheric plasma sprayed Yb-silicate coating was investigated during post-heat treatment. High-temperature X-ray diffraction (HT-XRD) was used to analyze the phase composition of the coating at elevated temperatures. Three metastable phases (Yb2Si2O7 (P-1), Yb2SiO5 (P21/c), Yb4.67Si3O13 (P63/m)) and two stable phases (Yb2Si2O7 (C2/m), Yb2SiO5 (I2/a)) preferentially crystallized from the amorphous coating starting at 1000 °C. Metastable phases transformed into stable Yb2Si2O7 and Yb2SiO5 at higher temperatures. HT-XRD data were used to estimate the volume expansion in the coating due to the phase transformation and the results were compared to the dilatometry measurements. The estimated expansion from HT-XRD data was larger than the measured expansion in dilatometry. Microstructural investigation revealed crack healing in the coating during the measurements which was associated with the lower expansion measured in dilatometry
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000902223100002
DO  - DOI:10.1016/j.scriptamat.2022.115169
UR  - https://juser.fz-juelich.de/record/912468
ER  -