Strong effect of atmosphere on the microstructure and microwave absorption properties of porous SiC ceramics

Shun Dong; Xinghong Zhang; Dongyang Zhang; Boqian Sun; Liwen Yan; Xiaoguang Luo

doi:10.1016/j.jeurceramsoc.2017.07.034

Strong effect of atmosphere on the microstructure and microwave absorption properties of porous SiC ceramics

Shun Dong^*
, Xinghong Zhang
, Dongyang Zhang
, Boqian Sun
, Liwen Yan
, Xiaoguang Luo

^*Corresponding author for this work

School of Astronautics

Harbin Institute of Technology
China Aerospace Science and Technology Corporation

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

Excellent microwave absorption properties of porous SiC ceramics were successfully synthesized using SiC/camphene slurries with various polycarbosilane (PCS) contents related to the SiC powder. The compositions of the nanowires (NWs) growth in the pore channels of porous SiC ceramics strongly depended on the pyrolysis atmosphere, with N₂-generating Si₃N₄ NWs and Ar SiC NWs. With the increase of PCS content, the minimum reflection coefficient (RC) of porous SiC ceramics decreased from −7.6 dB to −67.4 dB in Ar and from −10.9 dB to −24.7 dB in N₂, respectively. The effective absorption bandwidth (EAB) of porous SiC ceramics could be up to 8.1 GHz in Ar and 4.5 GHz in N₂. The enhanced microwave absorption properties of porous SiC ceramics could be attributed to the formation of SiC nano-crystalline, nanosized carbon and the NWs, which would increase the amount of boundaries and defects, leading to the electronic dipole polarization and interfacial scattering.

Original language	English
Pages (from-to)	29-39
Number of pages	11
Journal	Journal of the European Ceramic Society
Volume	38
Issue number	1
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2017.07.034
State	Published - Jan 2018

Keywords

Atmosphere
Microwave absorption property
Nanowires
Porous
SiC

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10.1016/j.jeurceramsoc.2017.07.034

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title = "Strong effect of atmosphere on the microstructure and microwave absorption properties of porous SiC ceramics",

abstract = "Excellent microwave absorption properties of porous SiC ceramics were successfully synthesized using SiC/camphene slurries with various polycarbosilane (PCS) contents related to the SiC powder. The compositions of the nanowires (NWs) growth in the pore channels of porous SiC ceramics strongly depended on the pyrolysis atmosphere, with N2-generating Si3N4 NWs and Ar SiC NWs. With the increase of PCS content, the minimum reflection coefficient (RC) of porous SiC ceramics decreased from −7.6 dB to −67.4 dB in Ar and from −10.9 dB to −24.7 dB in N2, respectively. The effective absorption bandwidth (EAB) of porous SiC ceramics could be up to 8.1 GHz in Ar and 4.5 GHz in N2. The enhanced microwave absorption properties of porous SiC ceramics could be attributed to the formation of SiC nano-crystalline, nanosized carbon and the NWs, which would increase the amount of boundaries and defects, leading to the electronic dipole polarization and interfacial scattering.",

keywords = "Atmosphere, Microwave absorption property, Nanowires, Porous, SiC",

author = "Shun Dong and Xinghong Zhang and Dongyang Zhang and Boqian Sun and Liwen Yan and Xiaoguang Luo",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2018",

month = jan,

doi = "10.1016/j.jeurceramsoc.2017.07.034",

language = "英语",

volume = "38",

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T1 - Strong effect of atmosphere on the microstructure and microwave absorption properties of porous SiC ceramics

AU - Dong, Shun

AU - Zhang, Xinghong

AU - Zhang, Dongyang

AU - Sun, Boqian

AU - Yan, Liwen

AU - Luo, Xiaoguang

PY - 2018/1

Y1 - 2018/1

N2 - Excellent microwave absorption properties of porous SiC ceramics were successfully synthesized using SiC/camphene slurries with various polycarbosilane (PCS) contents related to the SiC powder. The compositions of the nanowires (NWs) growth in the pore channels of porous SiC ceramics strongly depended on the pyrolysis atmosphere, with N2-generating Si3N4 NWs and Ar SiC NWs. With the increase of PCS content, the minimum reflection coefficient (RC) of porous SiC ceramics decreased from −7.6 dB to −67.4 dB in Ar and from −10.9 dB to −24.7 dB in N2, respectively. The effective absorption bandwidth (EAB) of porous SiC ceramics could be up to 8.1 GHz in Ar and 4.5 GHz in N2. The enhanced microwave absorption properties of porous SiC ceramics could be attributed to the formation of SiC nano-crystalline, nanosized carbon and the NWs, which would increase the amount of boundaries and defects, leading to the electronic dipole polarization and interfacial scattering.

AB - Excellent microwave absorption properties of porous SiC ceramics were successfully synthesized using SiC/camphene slurries with various polycarbosilane (PCS) contents related to the SiC powder. The compositions of the nanowires (NWs) growth in the pore channels of porous SiC ceramics strongly depended on the pyrolysis atmosphere, with N2-generating Si3N4 NWs and Ar SiC NWs. With the increase of PCS content, the minimum reflection coefficient (RC) of porous SiC ceramics decreased from −7.6 dB to −67.4 dB in Ar and from −10.9 dB to −24.7 dB in N2, respectively. The effective absorption bandwidth (EAB) of porous SiC ceramics could be up to 8.1 GHz in Ar and 4.5 GHz in N2. The enhanced microwave absorption properties of porous SiC ceramics could be attributed to the formation of SiC nano-crystalline, nanosized carbon and the NWs, which would increase the amount of boundaries and defects, leading to the electronic dipole polarization and interfacial scattering.

KW - Atmosphere

KW - Microwave absorption property

KW - Nanowires

KW - Porous

KW - SiC

UR - https://www.scopus.com/pages/publications/85026651529

U2 - 10.1016/j.jeurceramsoc.2017.07.034

DO - 10.1016/j.jeurceramsoc.2017.07.034

M3 - 文章

AN - SCOPUS:85026651529

SN - 0955-2219

VL - 38

SP - 29

EP - 39

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 1

ER -

Strong effect of atmosphere on the microstructure and microwave absorption properties of porous SiC ceramics

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Keywords

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