Corrosion behavior of precracked SiCf/SiC composites under 1200–1300°C Na2SO4‐wet‐oxygen environment

SiCf/SiC composites, as promising materials for the hot‐section components of turbine engines, are susceptible to hot corrosion due to the steam environments. Especially, under rotational and thermal stress, numerous microcracks may be generated in the SiCf/SiC ceramic matrix, which can trigger the...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2024-06, Vol.107 (6), p.3701-3715
Main Authors: Guo, Feiyu, Chen, Xiaowu, Zhang, Junmin, Yang, Jinshan, Zhang, Xiangyu, Kan, Yanmei, Xue, Yudong, Qin, Hao, Dong, Shaoming
Format: Article
Language:English
Subjects:
Ceramic fiber reinforced ceramics
Composite materials
Corrosion
corrosion behavior
Cracking (fracturing)
Failure mechanisms
Hot corrosion
Matrix cracks
Mechanical properties
Microcracks
Na2SO4‐wet‐oxygen
Oxidation
Oxygen
precrack
Prestressing
SiCf/SiC
Silicon carbide
Tensile strain
Thermal stress
Turbine engines
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Summary:SiCf/SiC composites, as promising materials for the hot‐section components of turbine engines, are susceptible to hot corrosion due to the steam environments. Especially, under rotational and thermal stress, numerous microcracks may be generated in the SiCf/SiC ceramic matrix, which can trigger the rapid invasion of corrosive gases and deteriorate the composite mechanical properties. Therefore, it is of great importance to investigate the degradation mechanisms of SiCf/SiC with precracks existing. Here, the corrosion behavior of precracked SiCf/SiC in the Na2SO4‐wet‐oxygen environment was evaluated. By comparing mechanical evolution under different corrosion conditions, microfailure mechanisms of SiCf/SiC were revealed. The results indicate that brittle cracking of the matrix and oxidation erosion of fibers are the key factors in reducing the tensile strain of composites. Specifically, the composite damage resistance increases at 67 MPa‐1300°C. At this point, the prestress level is moderate and close to the matrix cracking limit. The prefabricated microcracks can be healed at 1300°C by liquid oxidation products, which hinders cracks bridging large‐scale. This study is conducive to a better understanding of failure mechanisms of SiCf/SiC in complex service environments.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.19676