期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 739, 期 -, 页码 817-826出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.12.297
关键词
Environmental barrier coatings; Thermally grown silica oxide; Oxidants; Diffusion controlled processes
资金
- Chinese Natural Science Foundation [51032006, 51172181]
- Research Fund of State Key Laboratory of Solidification Processing [56-TZ-2010]
- project 111 [B08040]
- China Post-doctoral Science Foundation [2014M560656]
Environmental barrier coatings (EBCs) have widely been employed as protective coatings for SiC-based ceramic matrix composites (CMC-SiCs) against combustion corrosion in advanced gas turbines. During service, a layer of oxides forms beneath EBCs, which plays key role in lifetime of coated CMC-SiC parts. In this study, the kinetics of thermally grown silica oxide (silica-TGO) were examined through rare earth disilicates coated CMC-SiC composites subjected to corrosion under 50% H2O-50%O-2 gas flow environment. Results revealed that growth of silica-TGO followed parabolic behavior, indicating diffusion controlled process. Calculated growth rates and activation energies of silica-TGO suggested that oxygen ion was the main active oxidant involved at relatively low partial pressure of water vapor. Corrosion environments containing different H2O/O-2 ratios were also investigated and the data indicated that water vapor was also involved in growth of silica-TGO. The role of EBCs in corrosion process was also analyzed and discussed. (c) 2017 Elsevier B.V. All rights reserved.
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