High temperature corrosion of (Er0.25Tm0.25Yb0.25Lu0.25)2Si2O7 environmental barrier coating material subjected to water vapor and molten calcium–magnesium–aluminosilicate (CMAS). (October 2020)

• Record Type: Journal Article
• Authors: Sun, Luchao; Luo, Yixiu; Tian, Zhilin; Du, Tiefeng; Ren, Xiaomin; Li, Jialin; Hu, Wanpeng; Zhang, Jie; Wang, Jingyang
• Is Part Of: Corrosion science. Volume 175(2020)
• Publication Date: 2020-10
• Subjects: Environmental barrier coating -- Rare-earth disilicates -- Multicomponent -- Water vapor corrosion -- Calcium–magnesium–aluminosilicate (CMAS) corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.108881
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Multicomponent β-(Er0.25 Tm0.25 Yb0.25 Lu0.25 )2 Si2 O7 disilicate is reported as a good environmental barrier coating material. β-(Er0.25 Tm0.25 Yb0.25 Lu0.25 )2 Si2 O7 demonstrates good resistances to water vapor and molten CMAS corrosion at high temperatures. Our material shows improved resistance to CMAS corrosion at 1500 °C compared with its RE2 Si2 O7 counterparts containing single RE species. The results suggest a strategic multicomponent engineering in EBC candidate for corrosion resistance optimization. Abstract: Environmental barrier coatings (EBCs) are being developed to improve the durability of SiCf /SiC CMC components against harsh combustion environment. Among the most promising EBC candidates, rare-earth (RE) disilicates attract attentions for the good thermal and chemical compatibility with SiC CMCs. We herein investigate the high temperature corrosion resistances of a new multicomponent β-(Er0.25 Tm0.25 Yb0.25 Lu0.25 )2 Si2 O7 disilicate subjected to hot water vapor and molten CMAS. Multicomponent (Er0.25 Tm0.25 Yb0.25 Lu0.25 )2 Si2 O7 shows superior water vapor corrosion resistance at 1400 °C and significantly enhanced CMAS resistance at 1500 °C compared with single principal RE disilicates. The present results highlight the merit of multiple RE engineering in advanced EBCs for the improvement of crucial high temperature corrosion resistances in engine applications.