期刊
APPLIED SURFACE SCIENCE
卷 270, 期 -, 页码 611-616出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2013.01.093
关键词
SiC fibers; BN coating; Dielectric property; Impedance matching; Tensile strength
类别
资金
- Natural Science Foundation of China [50972119, 51002120]
- 111 Project [B08040]
- fund of the state key laboratory of solidification processing in Northwestern Polytechnical University [KB200920]
This work investigated electromagnetic wave (EMW) absorption and mechanical properties of silicon carbide (SiC) fibers with and without boron nitride (BN) coating by chemical vapor infiltration (CVI). The dielectric property and EM shielding effectiveness of SiC fiber bundles before and after being coated by BN were measured by wave guide method. The EM reflection coefficient of SiC fiber laminates with and without BN coating was determined by model calculation and NRL-arc method, respectively. Tensile properties of SiC fiber bundles with and without BN coating were tested at room temperature. Results show that SiC fibers with BN coating had a great improvement of EMW absorbing property because the composites achieved the impedance matching. BN with the low permittivity and dielectric loss contributed to the enhancive introduction and reduced reflection of EMW. The tensile strength and Weibull modulus of SiC fiber bundles coated by BN increased owing to the decrease of defects in SiC fibers and the protection of coating during loading. (C) 2013 Elsevier B.V. All rights reserved.
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