Effect of PyC interphase thickness on mechanical behaviors of SiBC matrix modified C/SiC composites fabricated by reactive melt infiltration
作者： Xiaoyu Cao , Xiaowei Yin , Xiaomeng Fan , Laifei Cheng , Litong Zhang
DOI: 10.1016/J.CARBON.2014.05.092
关键词: Composite material 、 Silicon carbide 、 Fracture toughness 、 Materials science 、 Interphase 、 Chemical vapor infiltration 、 Pyrolytic carbon 、 Infiltration (hydrology) 、 Flexural strength 、 Matrix (chemical analysis)
摘要: Abstract A dense carbon fiber reinforced silicon carbide matrix composites modified by SiBC (C/SiC-SiBC) was prepared a joint process of chemical vapor infiltration, slurry infiltration and liquid infiltration. The effects pyrolytic (PyC) interphase thickness on mechanical properties oxidation behaviors C/SiC-SiBC were evaluated. results showed that with an optimal PyC 450 nm exhibited flexural strength 412 MPa fracture toughness 24 MPa m1/2, which obtained 235% 300% improvement compared the one 50 nm-thick interphase. enhanced increase due to weakened interfacial bonding decrease micro-crack amount associated reduction thermal residual stress. With in porosity density, 450 nm-thick excellent resistance. after oxidized at 800, 1000 1200 °C air for 10 h 490, 500 480 MPa, increased 206%, 130% 108% those C/SiC composites.
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