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首页> 外文期刊>CERAMICS INTERNATIONAL >Mechanical and electromagnetic shielding properties of SiCf/SiC composites fabricated by combined CVI and PIP process
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Mechanical and electromagnetic shielding properties of SiCf/SiC composites fabricated by combined CVI and PIP process

机译：CVI和PIP结合制备的SiCf / SiC复合材料的机械和电磁屏蔽性能

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摘要

2.5D KD-I SiC_f/SiC composites were fabricated by combined chemical vapor infiltration (CVI) and precursor infiltration-pyrolysis (PIP) processes for electromagnetic interference (EMI) shielding applications. The effects of PyC interphase and Al_2O_3 filler on mechanical and EMI shielding properties of SiC_f/SiC composites were studied. The PyC interphase effectively improves the accommodation of the fibers and matrix, and Al_2O_3 filler compensates for matrix shrinkage and acts as a strengthening phase to improve the capability of bearing force for the composites. Thus, the composites with PyC interphase and Al_2O_3 filler possess the maximum flexural strength and fracture toughness with the values of 313 MPa and 12.7 MPa m~(1/2). Owing to the existence of excess carbon and PyC interphase, the composites also maintain the highest SE_T and SE_A values of 30 and 20 dB, respectively, indicating its advantages as a kind of structural and functional materials. The superior SE_A value is mainly attributed to the repeated reflection and dissipation of electromagnetic wave between the interfaces of PIP-SiC matrix and Al_2O_3 particles.
机译：2.5D KD-I SiC_f / SiC复合材料是通过化学气相渗透（CVI）和前体渗透热解（PIP）工艺相结合制成的，用于电磁干扰（EMI）屏蔽应用。研究了PyC中间相和Al_2O_3填料对SiC_f / SiC复合材料的机械和EMI屏蔽性能的影响。 PyC中间相有效地改善了纤维和基体的适应性，而Al_2O_3填料可补偿基体的收缩并充当强化相，以提高复合材料的承受力。因此，具有PyC中间相和Al_2O_3填料的复合材料具有最大的弯曲强度和断裂韧性，分别为313 MPa和12.7 MPa m〜（1/2）。由于存在过多的碳和PyC中间相，该复合材料还分别保持了最高SE_T和SE_A值30和20 dB，表明其作为一种结构和功能材料的优势。较高的SE_A值主要归因于PIP-SiC基质与Al_2O_3颗粒的界面之间电磁波的反复反射和耗散。

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