Processing and Microwave-absorption Properties of Iron-containing SiC Ceramics

doi:10.11944/j.issn.1000-0518.2018.02.170080

Chinese Journal of Applied Chemistry ›› 2018, Vol. 35 ›› Issue (2): 224-231.DOI: 10.11944/j.issn.1000-0518.2018.02.170080

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Processing and Microwave-absorption Properties of Iron-containing SiC Ceramics

LIU Xingyu,HU Zhiming,WU Pengfei,DONG Xichao,GUO Changqing,SU Zhiming,LIU Anhua()

Fujian Key Laboratory of Advanced Materials,Key Laboratory of High Performace Ceramic Fibers of Ministry of Education,College of Materials,Xiamen University,Xiamen,Fujian 361005,China

Received:2017-03-23 Accepted:2017-05-03 Published:2018-02-01 Online:2018-01-29
Contact: LIU Anhua
Supported by:
Supported by the National Natural Science Foundation of China(No.51603175), the Fundamental Research Funds for the Central Universities(No.20720150082)

Abstract

Abstract:

Different mass fraction of iron-containing silicon carbide(Fe/SiC) ceramics was successfully prepared by firstly synthesizing iron(Fe)-containing precursor via blending Fe colloids formed by the reaction of liquid polycarbosilane(PCS) and carbonyl iron with solid PCS and then the cross-linking and pyrolysis. The effects of the introduction of Fe on the component, structure, and magnetic and dielectric properties were systematically studied. When the mass fraction of iron is less than 8.94%, Fe element can significantly promote the decomposition of SiC_xO_y and generate β-SiC, and the crystallization peak of β-SiC is sharper with increased Fe. But when the Fe mass fraction increases to 11.78%, the main product is Fe₃Si; Fe-SiC ceramics are all ferromagnetic, and their saturation magnetization increases exponentially with the increase of iron. Fe/SiC ceramic with 4.19% Fe has a minimum -9.4 dB reflection loss at 12.4 GHz. The bandwidths of less than -5 dB for Fe/SiC cermic with 4.19% and 8.94% Fe are 2.4 GHz and 3.7 GHz, respectively, which can be used as good microwave-absorption materials.

Key words: SiC ceramics, magnetic loss, dielectric loss, microwave-absorption material

LIU Xingyu, HU Zhiming, WU Pengfei, DONG Xichao, GUO Changqing, SU Zhiming, LIU Anhua. Processing and Microwave-absorption Properties of Iron-containing SiC Ceramics[J]. Chinese Journal of Applied Chemistry, 2018, 35(2): 224-231.

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Processing and Microwave-absorption Properties of Iron-containing SiC Ceramics

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