Complex permittivity and microwave absorbing properties of SiC fiber woven fabrics

Ding, Donghai; Zhou, Weihua; Zhang, Biao; Luo, Fa; Zhu, Dongmei

doi:10.1007/s10853-010-5140-x

Cited by 86 publications

(26 citation statements)

References 28 publications

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“…The ceramic powders were homogeneously mixed with molten paraffin wax (weight ratio ceramic/paraffin wax of 4:6) and pressed into hollow cylinder‐shaped samples (inner diameter: 3.04 mm; external diameter: 7.00 mm; height: ≈ 2.5 mm). The paraffin wax is an insulator with the real and imaginary part of permittivity of ε′ ≈ 2.26 and ε″ ≈ 0 in the X‐band, respectively . The volume fraction of the ceramic powders within the composite samples is approximately 15 vol%.…”

Section: Methodsmentioning

confidence: 99%

Microwave Absorption of SiC/HfC_xN_1−x/C Ceramic Nanocomposites with HfC_xN_1−x‐Carbon Core–Shell Particles

Wen

Feng

et al. 2016

J. Am. Ceram. Soc.

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The dielectric properties of high‐temperature stable single‐source precursor‐derived SiC/HfCxN1−x/C ceramic nanocomposites are determined by microwave absorption in the X‐band (8.2–12.4 GHz) at room temperature. The samples synthesized at 1700°C, denoted as SiC/5HfCxN1−x/C‐1700°C and SiC/15HfCxN1−x/C‐1700°C ceramics, comprising ≈ 1.3 and ≈ 4.2 vol% HfCxN1−x, respectively, show enhanced microwave absorption capability superior to hafnium‐free SiC/C‐1700°C. The minimum reflection loss of SiC/5HfCxN1−x/C‐1700°C and SiC/15HfCxN1−x/C‐1700°C are −47 and −32 dB, and the effective absorption bandwidth amount to 3.1 and 3.6 GHz, respectively. Segregated carbon, including graphitic carbon homogeneously dispersed in the SiC matrix and less ordered carbon deposited as a thin film on HfCxN1−x nanoparticles, accounts for the unique dielectric behavior of the SiC/HfCxN1−x/C ceramics. Due to their large reflection loss and their high chemical and temperature stability, SiC/5HfCxN1−x/C‐1700°C and SiC/15HfCxN1−x/C‐1700°C ceramics are promising candidate materials for electromagnetic interference applications in harsh environment.

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Section: Methodsmentioning

confidence: 99%

Microwave Absorption of SiC/HfC_xN_1−x/C Ceramic Nanocomposites with HfC_xN_1−x‐Carbon Core–Shell Particles

Wen

Feng

et al. 2016

J. Am. Ceram. Soc.

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“…The RL values were calculated to predict the high-temperature microwave absorption properties of SiC f /SiC-Al 2 O 3 composites, which can be expressed as the following equation [25]:…”

Section: Evaluation Of Microwave Absorption Propertymentioning

confidence: 99%

“…It has been identified by Liu that the turbostratic PyC is the main constituent on the surface layer of KD-I SiC fiber [28]. This PyC phase generally contributes to enhancing the electrical conductivity of SiC fabrics and leads to strong reflections of the electromagnetic microwaves [25]. Thus, the decarbonization process was conducted to decrease the relative carbon content of the fibers.…”

Section: Dielectric Properties Of Sic F /Sic-al 2 O 3 Composites At Hmentioning

confidence: 99%

Temperature-dependent dielectric and microwave absorption properties of SiC /SiC–Al2O3 composites modified by thermal cross-linking procedure

Yang

Zhou

Yang

et al. 2015

Journal of the European Ceramic Society

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“…[3][4][5][6] However, the utilization of such materials is limited by their low toughness with a value of approximately 3-4 MPa m 1/2 . [10][11][12][13] In a number of SiC f /SiC composites, the reinforcing bers are usually coated with layered structures such as pyrolytic carbon (PyC) and/or boron nitride (BN). [7][8][9] This is achieved when debonding of the ber-matrix interface and ber pullout are activated, which is facilitated by a ber coating that provides an interfacial layer that debonds fairly readily during loading of the composite.…”

Section: Introductionmentioning

confidence: 99%

Influence of dip-coated MgO interphase on the mechanical and dielectric properties of 2D-SiC_f/SiC composites

et al. 2016

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This work focused on the use of the dip-coating process to prepare magnesium oxide (MgO) coatings on silicon carbide fibers (SiC f ) as an interfacial system for SiC f /SiC composites. The MgO coatings were prepared on KD-I SiC f using thermal decomposition of magnesium acetate tetrahydrate (C 4 H 6 MgO 4 $4H 2 O) in a vacuum furnace. The effect of the amount of C 4 H 6 MgO 4 $4H 2 O on the coating's microstructure and morphology, mechanical and dielectric properties of SiC f /SiC composites were investigated. The Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray diffraction results show that the coating's surface is relatively smooth and uniform as the content of C 4 H 6 MgO 4 $4H 2 O reaches 3 wt%. The SiC f /SiC composites containing an 0.18 mm thick MgO interphase show improved mechanical properties in terms of flexural strength and failure displacement. Also the complex permittivity for composites with an MgO interphase is a little lower than the as-received composites because of the low electric conductivity of MgO. The effective microwave absorbingbandwidth (below À10 dB) for composites is in the range 8.8-11.5 GHz, and the minimal reflection loss reached À12.56 dB.

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Complex permittivity and microwave absorbing properties of SiC fiber woven fabrics

Cited by 86 publications

References 28 publications

Microwave Absorption of SiC/HfC_xN_1−x/C Ceramic Nanocomposites with HfC_xN_1−x‐Carbon Core–Shell Particles

Microwave Absorption of SiC/HfC_xN_1−x/C Ceramic Nanocomposites with HfC_xN_1−x‐Carbon Core–Shell Particles

Temperature-dependent dielectric and microwave absorption properties of SiC /SiC–Al2O3 composites modified by thermal cross-linking procedure

Influence of dip-coated MgO interphase on the mechanical and dielectric properties of 2D-SiC_f/SiC composites

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Complex permittivity and microwave absorbing properties of SiC fiber woven fabrics

Cited by 86 publications

References 28 publications

Microwave Absorption of SiC/HfCxN1−x/C Ceramic Nanocomposites with HfCxN1−x‐Carbon Core–Shell Particles

Microwave Absorption of SiC/HfCxN1−x/C Ceramic Nanocomposites with HfCxN1−x‐Carbon Core–Shell Particles

Temperature-dependent dielectric and microwave absorption properties of SiC /SiC–Al2O3 composites modified by thermal cross-linking procedure

Influence of dip-coated MgO interphase on the mechanical and dielectric properties of 2D-SiCf/SiC composites

Contact Info

Product

Resources

About

Microwave Absorption of SiC/HfC_xN_1−x/C Ceramic Nanocomposites with HfC_xN_1−x‐Carbon Core–Shell Particles

Microwave Absorption of SiC/HfC_xN_1−x/C Ceramic Nanocomposites with HfC_xN_1−x‐Carbon Core–Shell Particles

Influence of dip-coated MgO interphase on the mechanical and dielectric properties of 2D-SiC_f/SiC composites