☆ 4.7 Article

Effect of fibre directionality on the microwave absorption properties of 3D braided SiCf/SiC composites

CERAMICS INTERNATIONAL (2019)

期刊

CERAMICS INTERNATIONAL

卷 45, 期 6, 页码 7797-7803

出版社

ELSEVIER SCI LTD

DOI: 10.1016/j.ceramint.2019.01.085

关键词

3D SiCf/SiC composites; Preform architecture; Microwave absorption; Dielectric properties

类别

Materials Science, Ceramics

资金

National Natural Science Foundation of China [21071011]

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Reagent

摘要

SiCf/SiC composites reinforced with three-dimensional (3D) four- and five-directional braided SiC fibre preforms were successfully prepared through precursor infiltration pyrolysis method. The microwave absorption and dielectric performances of the two-composites were compared and investigated in the X-band. The 3D five-directional braided SiCf/SiC composites exhibited superior microwave absorption abilities with a minimum reflection loss of - 16.1 dB at 8.2 GHz and an effective bandwidth of 1.5 GHz with a thickness of 5 mm which were larger than those of the 3D four-directional composites. The differences in these properties of the two composites were attributed to the presence of axial yarns in the 3D five-directional braided composites. The fibre placement in the preform significantly affected the dielectric and microwave absorption properties of the composites. Results suggested that 3D five-directional braided SiCf/SiC composites are promising high-performance microwave absorption materials.

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