Degradation mechanism of SiCf/SiC composites after long-time water vapor and oxygen corrosion at 1300 °C

被引：40

作者：

Zhang, Jin ^{[1
]}

Liu, Rongjun ^{[1
]}

Jian, Yingjie ^{[1
]}

Wan, Fan ^{[1
]}

Wang, Yanfei ^{[1
]}

机构：

[1] Natl Univ Def Technol, Coll Aerosp Sci & Engn, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Hunan, Peoples R China

来源：

CORROSION SCIENCE | 2022年 / 197卷

关键词：

Degradation mechanism; SiCf/SiC composites; Hybrid CVI and PIP technique; Water vapor corrosion; Pyrolytic carbon interphase; HIGH-TEMPERATURE OXIDATION; CERAMIC-MATRIX COMPOSITES; THERMAL-STABILITY; SILICON-CARBIDE; BEHAVIOR; PRESSURE; VOLATILIZATION; KINETICS; AIR; WET;

D O I：

10.1016/j.corsci.2022.110099

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion behavior and corresponding mechanisms of SiCf/SiC composites have been studied in a mixed water vapor and oxygen environment at 1300 degrees C for up to 120 h.It has been unveiled that, the formation of liquid amorphous silica fulfilling gaps left by the oxidation of pyrolytic carbon interphase is extremely detrimental due to that: 1) the precipitation of liquid amorphous silica generates a very strong bonding with fibers; and that 2) the stress accumulation within silica layers owing to phase transformation and growth of silica drives them crack. These cracks would inevitably propagate to break fibers, thereby almost completely degrading composites.

引用

页数：10

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