Damage mechanisms of SiC fibers and BN interphase in SiCf/SiC composites during NITE process

被引:0
|
作者
Zhang, Yu [1 ,2 ,3 ]
Shen, Xu [1 ,2 ,3 ]
Ma, Qin [1 ,2 ,3 ]
Mu, Shuang [1 ,2 ,3 ]
Dong, Shaoming [1 ,2 ]
Yang, Jinshan [1 ,2 ]
机构
[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine M, Shanghai 200050, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Ceram, Struct Ceram & Composites Engn Res Ctr, Shanghai 200050, Peoples R China
[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
NITE process; Mechanical behavior; Damage mechanism; SILICON; MICROSTRUCTURE; IMPREGNATION; TEMPERATURE; PYROLYSIS; THICKNESS; STRENGTH; BEHAVIOR;
D O I
10.1016/j.compositesb.2024.111923
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this work, the mechanical behavior of NITE-SiCf/SiC composites, accompanied by the damage mechanisms of SiC fibers and BN interphase during NITE process, are investigated. The results show that the fracture characteristic of NITE-SiCf/SiC composite is transformed from quasi-ductile mode to brittle mode with the elevating temperature, as well as severe damage of SiC fiber and BN interphase. The damage of SiC fibers is originated from high temperature, sintering aids corrosion and matrix compression. High temperature and sintering aids diffusion lead to the grain growth and strength degradation of SiC fibers. The damage of BN interphase is caused by the sintering aids corrosion, mainly the reaction of Al2O3, and matrix compression. The stress distribution is simulated via finite element analysis proving that up to 17.5 GPa and 17.0 GPa stress originated from matrix shrinkage during sintering process is applied to the fiber and interphase respectively, making the fiber deformation and interphase fragmentation. The degraded fiber strength and destroyed interphase structure weaken the load-bearing capacity and crack deflection ability, causing degradation of mechanical properties and reliability of composites. This work helps to comprehensively understand and optimize the properties of SiCf/SiC composites prepared by NITE process.
引用
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页数:12
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