☆ 4.4 Article

Dielectric properties of porous SiC/Si3N4 ceramics by polysilazane immersion-pyrolysis

PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL (2019)

期刊

PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL

卷 29, 期 2, 页码 184-189

出版社

ELSEVIER SCIENCE INC

DOI: 10.1016/j.pnsc.2019.03.009

关键词

SiC; Si3N4; Dipping; Dielectric properties

类别

Materials Science, Multidisciplinary Multidisciplinary Sciences

资金

National Natural Science Foundation of China [51572154]

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摘要

The SiC nanotubes were synthesized on porous Si3N4 matrix by polysilazane immersion-pyrolysis. The beta-SiC and free C contents increased with the increasing dipping times, which cause some clear vibration and loss peaks of the dielectric constant patterns emerged at around 12.9 GHz and 14.7 GHz in the samples of 20 wt% and 30 wt% benzoic acid, respectively. The reflectivity of the obtained ceramics were -7dB similar to -10dB from the frequency of 8 GHz-18 GHz, which means that the amount of 80%-90% electromagnetic wave could be attenuated. The ceramics containing 40 wt% benzoic acid showed the high loss, low reflectivity and a wide absorbing band, indicating the high absorbing efficiency and good dielectric properties.

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