Dielectric and microwave absorption properties of AlN-SiBCN lossy ceramics

Yongqin He; Xiaoyun Li; Jingxian Zhang; Xiaoguang Li; Mingxian Yu; Yusen Duan; Dongliang Jiang; Tai Qiu

doi:10.1111/ijac.12793

Dielectric and microwave absorption properties of AlN-SiBCN lossy ceramics

Yongqin He, Xiaoyun Li, Jingxian Zhang, Xiaoguang Li, Mingxian Yu, Yusen Duan, Dongliang Jiang, Tai Qiu

College of Materials Science and Engineering

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

14 Scopus citations

Abstract

Dense AlN-SiBCN ceramics were fabricated by pyrolysis of a commercially available polyborosilazane followed by hot-pressing of AlN and SiBCN mixture in N₂ atmosphere. The effect of SiBCN content on phase behavior, microstructure, electrical conductivity, dielectric and microwave absorption properties of the composites were investigated. The results showed that characteristic peaks of Si₃N₄, SiC, and BNC appeared above 1650°C during the annealing of SiBCN powder. The composites fabricated with 30 wt.% SiBCN had the highest electrical conductivity and dielectric permittivity, which can be attributed to the formation of SiC nanoparticles. With further increase in SiBCN content, the composites showed the lowest reflection coefficient of −30.88 dB at 8.5 GHz and the frequency bandwidth of 1 GHz below −10 dB in X-band.

Original language	English
Pages (from-to)	522-530
Number of pages	9
Journal	International Journal of Applied Ceramic Technology
Volume	15
Issue number	2
DOIs	https://doi.org/10.1111/ijac.12793
State	Published - 1 Mar 2018

Keywords

dielectric properties
microstructure
microwaves

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10.1111/ijac.12793

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title = "Dielectric and microwave absorption properties of AlN-SiBCN lossy ceramics",

abstract = "Dense AlN-SiBCN ceramics were fabricated by pyrolysis of a commercially available polyborosilazane followed by hot-pressing of AlN and SiBCN mixture in N2 atmosphere. The effect of SiBCN content on phase behavior, microstructure, electrical conductivity, dielectric and microwave absorption properties of the composites were investigated. The results showed that characteristic peaks of Si3N4, SiC, and BNC appeared above 1650°C during the annealing of SiBCN powder. The composites fabricated with 30 wt.% SiBCN had the highest electrical conductivity and dielectric permittivity, which can be attributed to the formation of SiC nanoparticles. With further increase in SiBCN content, the composites showed the lowest reflection coefficient of −30.88 dB at 8.5 GHz and the frequency bandwidth of 1 GHz below −10 dB in X-band.",

keywords = "dielectric properties, microstructure, microwaves",

author = "Yongqin He and Xiaoyun Li and Jingxian Zhang and Xiaoguang Li and Mingxian Yu and Yusen Duan and Dongliang Jiang and Tai Qiu",

note = "Publisher Copyright: {\textcopyright} 2017 The American Ceramic Society",

year = "2018",

month = mar,

day = "1",

doi = "10.1111/ijac.12793",

language = "英语",

volume = "15",

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TY - JOUR

T1 - Dielectric and microwave absorption properties of AlN-SiBCN lossy ceramics

AU - He, Yongqin

AU - Li, Xiaoyun

AU - Zhang, Jingxian

AU - Li, Xiaoguang

AU - Yu, Mingxian

AU - Duan, Yusen

AU - Jiang, Dongliang

AU - Qiu, Tai

PY - 2018/3/1

Y1 - 2018/3/1

N2 - Dense AlN-SiBCN ceramics were fabricated by pyrolysis of a commercially available polyborosilazane followed by hot-pressing of AlN and SiBCN mixture in N2 atmosphere. The effect of SiBCN content on phase behavior, microstructure, electrical conductivity, dielectric and microwave absorption properties of the composites were investigated. The results showed that characteristic peaks of Si3N4, SiC, and BNC appeared above 1650°C during the annealing of SiBCN powder. The composites fabricated with 30 wt.% SiBCN had the highest electrical conductivity and dielectric permittivity, which can be attributed to the formation of SiC nanoparticles. With further increase in SiBCN content, the composites showed the lowest reflection coefficient of −30.88 dB at 8.5 GHz and the frequency bandwidth of 1 GHz below −10 dB in X-band.

AB - Dense AlN-SiBCN ceramics were fabricated by pyrolysis of a commercially available polyborosilazane followed by hot-pressing of AlN and SiBCN mixture in N2 atmosphere. The effect of SiBCN content on phase behavior, microstructure, electrical conductivity, dielectric and microwave absorption properties of the composites were investigated. The results showed that characteristic peaks of Si3N4, SiC, and BNC appeared above 1650°C during the annealing of SiBCN powder. The composites fabricated with 30 wt.% SiBCN had the highest electrical conductivity and dielectric permittivity, which can be attributed to the formation of SiC nanoparticles. With further increase in SiBCN content, the composites showed the lowest reflection coefficient of −30.88 dB at 8.5 GHz and the frequency bandwidth of 1 GHz below −10 dB in X-band.

KW - dielectric properties

KW - microstructure

KW - microwaves

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U2 - 10.1111/ijac.12793

DO - 10.1111/ijac.12793

M3 - 文章

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SN - 1546-542X

VL - 15

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EP - 530

JO - International Journal of Applied Ceramic Technology

JF - International Journal of Applied Ceramic Technology

IS - 2

ER -

Dielectric and microwave absorption properties of AlN-SiBCN lossy ceramics

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Keywords

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