TY - JOUR
T1 - Calcium–magnesium aluminosilicate corrosion of barium–strontium aluminosilicates with different strontium content
AU - Jiang, Fengrui
AU - Cheng, Laifei
AU - Wang, Yiguang
AU - Huang, Xuanxuan
N1 - Publisher Copyright:
© 2016 Elsevier Ltd and Techna Group S.r.l.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - In this study, the hot corrosion of barium–strontium aluminosilicate (B1−xSxAS) attacked by calcium–magnesium aluminosilicate (CMAS) was investigated at temperatures in the 1200–1400 °C range. Moreover, a corrosion mechanism based on the interdiffusion of Ba/Sr and Ca cations was also proposed. The proposed corrosion mechanism indicated the diffusion of Ba/Sr cations into the CMAS, and Ca cations into the B1−xSxAS during the hot corrosion process. At 1200 °C, a thin corrosion zone was formed at the interface of B1−xSxAS and CMAS due to weak diffusion of Ba/Sr and Ca cations. Further increase in the temperature led to an enhancement in the interdiffusion of Ba/Sr and Ca cations, thus significantly widening the corrosion zone. Moreover, oriental dendrites, identified as monoclinic B1−xSxAS, were found to precipitate in the molten CMAS. Attributed to the faster diffusion rate of Sr cations compared to that of the Ba cations, B1−xSxAS with a higher Sr content was found to be more prone to CMAS-induced corrosion due to the rapid loss of Sr.
AB - In this study, the hot corrosion of barium–strontium aluminosilicate (B1−xSxAS) attacked by calcium–magnesium aluminosilicate (CMAS) was investigated at temperatures in the 1200–1400 °C range. Moreover, a corrosion mechanism based on the interdiffusion of Ba/Sr and Ca cations was also proposed. The proposed corrosion mechanism indicated the diffusion of Ba/Sr cations into the CMAS, and Ca cations into the B1−xSxAS during the hot corrosion process. At 1200 °C, a thin corrosion zone was formed at the interface of B1−xSxAS and CMAS due to weak diffusion of Ba/Sr and Ca cations. Further increase in the temperature led to an enhancement in the interdiffusion of Ba/Sr and Ca cations, thus significantly widening the corrosion zone. Moreover, oriental dendrites, identified as monoclinic B1−xSxAS, were found to precipitate in the molten CMAS. Attributed to the faster diffusion rate of Sr cations compared to that of the Ba cations, B1−xSxAS with a higher Sr content was found to be more prone to CMAS-induced corrosion due to the rapid loss of Sr.
KW - Barium–strontium aluminosilicates
KW - Calcium–magnesium aluminosilicate
KW - Environmental barrier coatings
KW - Hot corrosion
UR - http://www.scopus.com/inward/record.url?scp=84996555403&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2016.09.138
DO - 10.1016/j.ceramint.2016.09.138
M3 - Article
AN - SCOPUS:84996555403
SN - 0272-8842
VL - 43
SP - 212
EP - 221
JO - Ceramics International
JF - Ceramics International
IS - 1
ER -