@article{Tian2023, 
author = {Zhilin Tian and Keyu Ming and Liya Zheng and Zhilin Chen and Fan Zhou and Peng Liu and Zihao Qiu and Donghui Wei and Bin Li and Jingyang Wang},
title = {In-situ observation and mechanism of calcium–magnesium–alumina–silicate (CMAS) melts-induced degradation of RE2SiO5 (RE = Tb, Dy, Ho, Y, Er, Tm, and Yb) ceramics at 1500 °C},
year = {2023},
journal = {Journal of Advanced Ceramics},
volume = {12},
number = {12},
pages = {2315-2330},
keywords = {high temperature, calcium–magnesium–alumina–silicate (CMAS) corrosion, environmental barrier coating, rare earth (RE) silicate},
url = {https://www.sciopen.com/article/10.26599/JAC.2023.9220822},
doi = {10.26599/JAC.2023.9220822},
abstract = {Rare earth (RE) silicate is one of the most promising environmental barrier coatings for silicon-based ceramics in gas turbine engines. However, calcium–magnesium–alumina–silicate (CMAS) corrosion becomes much more serious and is the critical challenge for RE silicate with the increasing operating temperature. Therefore, it is quite urgent to clarify the mechanism of high-temperature CMAS-induced degradation of RE silicate at relatively high temperatures. Herein, the interaction between RE2SiO5 and CMAS up to 1500 ℃ was investigated by a novel high-temperature in-situ observation method. High temperature promotes the growth of the main reaction product (Ca2RE8(SiO4)6O2) fast along the [001] direction, and the precipitation of short and horizontally distributed Ca2RE8(SiO4)6O2 grains was accelerated during the cooling process. The increased temperature increases the solubility of RE elements, decreases the viscosity of CMAS, and thus elevates the corrosion reaction rate, making RE2SiO5 fast interaction with CMAS and less affected by RE element species.}
}