Fabrication of Si3N4–SiBC composite ceramic and its excellent electromagnetic properties

Ye, Fang; Zhang, Litong; Yin, Xiaowei; Zuo, Xinzhang; Liu, Yongsheng; Cheng, Laifei

doi:10.1016/j.jeurceramsoc.2012.07.002

Cited by 35 publications

(21 citation statements)

References 15 publications

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“…As dielectric-loss-type EM absorption materials, silicon carbide (SiC)-based ceramics and silicon nitride (Si 3 N 4 ) ceramics are two main candidates for EM wave absorbers. The Si 3 N 4 and SiC-based ceramics with different elements (boron, nitrogen, nickel, and aluminum), − SiC nanowire-reinforced SiOC ceramics, Si 3 N 4 –SiC/SiO 2 , Si 3 N 4 –SiBC composite, and carbon fiber/silica composites have all been widely studied. However, a uniform combination of a high dielectric constant microwave absorber and a low dielectric transparent matrix is an urgent problem that needs to be addressed.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Stable and Metal-Free Electromagnetic Wave-Absorbing SiBCN Ceramics Derived from Carbon-Rich Hyperbranched Polyborosilazanes

Luo

Tang

Tian

et al. 2018

ACS Appl. Mater. Interfaces

131

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High-temperature stable and metal-free siliconboron carbonitride ceramics with high electromagnetic (EM) wave-absorbing efficiency were achieved through the structural design and pyrolysis of carbon-rich hyperbranched polyborosilazane precursors with pendent phenyl groups. The introduction of benzene rings into the precursors dramatically changes the microstructure and the EM wave-absorbing property of ceramics. It reveals that the ceramics pyrolyzed from the benzene ring-containing preceramic precursors have a higher carbon content and a larger number of sp carbons and generate crystalline carbons (graphitic carbons and tubular carbons) in situ, which lead to excellent EM wave-absorbing properties. The EM wave absorption efficiency and effective absorption bandwidth (EAB, reflection coefficient (RC) below -10 dB) can be tuned via annealing of the ceramics. The ceramics stable at 1320 °C exhibit their optimized EM wave-absorbing performance with a minimum RC (RC) of -71.80 dB and an EAB of 3.65 GHz (8.2-11.85 GHz). We believe that the research extends the design strategy of advanced EM wave-absorbing functional materials, which have great potential as promising absorbers in commercial or military applications.

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Section: Introductionmentioning

confidence: 99%

High-Temperature Stable and Metal-Free Electromagnetic Wave-Absorbing SiBCN Ceramics Derived from Carbon-Rich Hyperbranched Polyborosilazanes

Luo

Tang

Tian

et al. 2018

ACS Appl. Mater. Interfaces

131

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show abstract

“…In the recent few years, with the rapid development of communication technology and advanced electronic devices such as radars, diagnostic, detection systems and traveling‐wave tube, microwave absorption materials have attracted more and more attention not only at common environments but at vacuum and some high temperature environments . Polymer‐derived SiBCN (PDCs‐SiBCN) is a promising candidate due to its high temperature stability up to 2000°C, remarkable high oxidation resistance and excellent electromagnetic wave absorption properties .…”

Section: Introductionmentioning

confidence: 99%

Dielectric and microwave absorption properties of AlN‐SiBCN lossy ceramics

Zhang

et al. 2017

Int J Applied Ceramic Tech

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Dense AlN-SiBCN ceramics were fabricated by pyrolysis of a commercially available polyborosilazane followed by hot-pressing of AlN and SiBCN mixture in N 2 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 Si 3 N 4 , 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 À30.88 dB at 8.5 GHz and the frequency bandwidth of 1 GHz below À10 dB in X-band. K E Y W O R D S dielectric properties, microstructure, microwaves

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“…The RC-thickness relation curves of sample S2, S3 and S4 are shown in Fig.2(d), (e) and (f), the RC min of which attained À 20.4, À 57 and -13.6 dB. Table 1 also summarizes the absorption properties of other ceramic composites materials [2,11,[19][20][21][22]. Therefore, Si 3 N 4 -SiC ceramics with the in-situ formed SiC NWs show very promising absorption property.…”

Section: Resultsmentioning

confidence: 90%

Absorption properties of twinned SiC nanowires reinforced Si3N4 composites fabricated by 3d-prining

et al. 2015

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Fabrication of Si3N4–SiBC composite ceramic and its excellent electromagnetic properties

Cited by 35 publications

References 15 publications

High-Temperature Stable and Metal-Free Electromagnetic Wave-Absorbing SiBCN Ceramics Derived from Carbon-Rich Hyperbranched Polyborosilazanes

High-Temperature Stable and Metal-Free Electromagnetic Wave-Absorbing SiBCN Ceramics Derived from Carbon-Rich Hyperbranched Polyborosilazanes

Dielectric and microwave absorption properties of AlN‐SiBCN lossy ceramics

Absorption properties of twinned SiC nanowires reinforced Si3N4 composites fabricated by 3d-prining

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