High temperature dielectric and microwave absorption properties of polymer derived SiCN ceramic in X band

Quan Li, Xiaowei Yin, Luo Kong, Wenyan Duan, Litong Zhang, Laifei Cheng

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Polymer derived SiCN ceramic (PDC-SiCN) composed of SiC and Si 3N4 was obtained through pyrolysis of a kind of polysilazane at 1700°C in N2. The high temperature relative complex permittivities of PDC-SiCN were measured at temperatures from room temperature to 600°C in the X band (8.2-12.4 GHz). The average real permittivity, imaginary permittivity and loss tangent of PDC-SiCN were 12.2, 5.8 and 0.47 at room temperature, and increased to 14.4, 9.3 and 0.64, respectively. The microwave absorption property of PDC-SiCN was calculated using metal back-panel model. The average reflectivity of sample in X band with sample thickness of 2.05 mm at room temperature was -12.8 dB, and increased to -8.6 dB at 600°C. The decrease of the microwave absorption property was attributed to the impedance mismatch between air and sample with the increasing temperatures.

Original languageEnglish
Title of host publicationHigh Temperature Ceramic Matrix Composites 8 - A Collection of Papers Presented at the HTCMC 2013 Conference
PublisherAmerican Ceramic Society
Pages195-202
Number of pages8
ISBN (Print)9781118932988
DOIs
StatePublished - 2014
Event8th High Temperature Ceramic Matrix Composites Conference, HTCMC 2013 - Xi'an, Shaanxi, China
Duration: 22 Sep 201326 Sep 2013

Publication series

NameCeramic Transactions
Volume248
ISSN (Print)1042-1122

Conference

Conference8th High Temperature Ceramic Matrix Composites Conference, HTCMC 2013
Country/TerritoryChina
CityXi'an, Shaanxi
Period22/09/1326/09/13

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