Effects of microstructure on corrosion behaviors for RE2SiO5 (RE=Gd, Y, Er) environmental barrier coatings against calcium-magnesium-alumino-silicate melts. (1st May 2022)

• Record Type: Journal Article
• Authors: Zhong, Xin; Wang, Yawen; Liu, Pingping; Huang, Liping; Niu, Yaran; Li, Qilian; Zhang, Le; Zheng, Xuebin
• Is Part Of: Corrosion science. Volume 199(2022)
• Publication Date: 2022-05-01
• Subjects: Rare-earth silicates -- Environmental barrier coatings -- CMAS corrosion behaviors -- Corrosion mechanisms; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110174
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The corrosion behaviors and mechanisms of plasma-sprayed X1-Gd2 SiO5 and X2-RE2 SiO5 (RE=Y, Er) environmental barrier coatings against CMAS melts at 1400 °C were explored. Results showed that the RE2 SiO5 coatings dissolved into CMAS melts and formed a continuous dense layer of apatite phase at the interface, while garnet phase was only found in the X2-Er2 SiO5 coating. The recession of RE2 SiO5 was related to its microstructure and RE ionic radius. The RE2 SiO5 with X2 phase and smaller RE ionic radius exhibited better corrosion resistance due to its more stable crystal structure, lower reactivity with CMAS and easier to form garnet phase. Graphical Abstract: ga1 Highlights: ● Crystal structure and RE ionic radius significantly influenced corrosion behaviors. ● RE2 SiO5 with small RE exhibited better corrosion resistance. ● The X2-Er2 SiO5 coating exhibited best corrosion resistance. ● The formation of garnet phase was beneficial to its corrosion resistance.