期刊
CORROSION SCIENCE
卷 124, 期 -, 页码 131-137出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2017.05.016
关键词
Ceramic matrix composites; Molten salt; SEM; XRD; Exfoliation corrosion; High temperature corrosion
资金
- Strategic Priority Research Programme of the Chinese Academy of Sciences [XDA02040203]
- National Nature Science Foundation of China [51502323]
- Natural Science Foundation of Shanghai, China [14ZR1445800]
High temperature mechanical properties and microstructure evolution of chemical-vapor-infiltrated SiC fiber reinforced SiC ceramic matrix composites (SiCf/SiC) in 46.5LiF-11.5NaF-42.0KF (mol.%, FLiNaK) eutectic salt were investigated. The results indicate that the corrosion of SiCf/SiC composites was accelerated with increase of corrosion temperature. Interlayer boundaries in SiC matrix with higher oxygen content were corroded preferentially. The F- formed Si-F coordinate bond with SiC and replaced carbon, followed by the corrosion of SiC matrix. While single SiC fiber tensile strength suffered no depravation after corrosion, corrosion and damage of SiC matrix, led to deteriorated high temperature mechanical properties of SiCf/SiC composites.
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