High-temperature corrosion of HfSiO4 environmental barrier coatings exposed to water vapor/oxygen atmosphere and molten calcium magnesium aluminosilicate

The hot corrosion behavior of plasma-sprayed HfSiO4 coatings exposed to molten calcium magnesium aluminosilicate (CMAS) and steam was investigated. No reactive crystallization was observed in the CMAS-attacked HfSiO4 coating which consist of tetragonal HfSiO4 and monoclinic HfO2. The penetration did...

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Bibliographic Details
Published in:Corrosion science 2022-04, Vol.197, p.110081, Article 110081
Main Authors: Dong, Shujuan, Lü, Kaiyue, Wang, Yihui, Zeng, Jinyan, Yuan, Jieyan, Jiang, Jianing, Deng, Longhui, Cao, Xueqiang
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminum silicates
Calcium
CMAS attack
Coatings
Corrosion
Corrosion resistance
Crystallization
EBCs
HfSiO4
High temperature
Hot corrosion
Incompatibility
Magnesium aluminosilicate
Microcracks
Phase transitions
Steam exposure
Water vapor
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Summary:The hot corrosion behavior of plasma-sprayed HfSiO4 coatings exposed to molten calcium magnesium aluminosilicate (CMAS) and steam was investigated. No reactive crystallization was observed in the CMAS-attacked HfSiO4 coating which consist of tetragonal HfSiO4 and monoclinic HfO2. The penetration did not bring obvious volume expansion thanks to the buffering effect of the pores/microcracks. The bilayer environmental barrier coating (EBC) systems using HfSiO4 as top coat and Si as bond coat have the great resistance against steam corrosion. The coating degradation at high temperatures was associated with TGO volatilization and phase transformation as well as thermomechanical incompatibility. •Hot corrosion behavior of plasma-sprayed HfSiO4 coatings exposed to steam and CMAS was investigated.•The bilayer EBCs using HfSiO4 as top coat and Si as bond coat have the great resistance against steam corrosion.•CMAS-attacked HfSiO4 coatings consist of tetragonal HfSiO4 and monoclinic HfO2.•Degradation mechanisms of HfSiO4 coatings exposed to steam and CMAS were discussed.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.110081