Tuning the dielectric properties of porous BN/Si3N4 composites by controlling porosity

Ye, Jian; Zhang, Biao; Zhang, Haoqian; Zhong, Zhaoxin; Wang, Yan; Liu, Qiang; Ye, Feng

doi:10.1016/j.jeurceramsoc.2022.10.035

Cited by 17 publications

(2 citation statements)

References 37 publications

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“…This is partly related to the smaller dielectric constant of BN (∼4.9) compared to Si 3 N 4 (∼7.9). , On the contrary, when the quantity of BNNSs incorporated into the composites increases, the porosity gradually enhances. This results in a gradual reduction in the real component of the dielectric constant of the composites, , as the dielectric constant of air is 1. As demonstrated in Figure b,e, the curves present the variation of the imaginary component of the dielectric constant of the composite samples across the X and Ku bands.…”

Section: Resultsmentioning

confidence: 99%

Efficient Preparation of BNNSs and Their Performance Study of Reinforced Porous Si₃N₄ Composites by Gel Casting

Liang,

Bi,

Yin

et al. 2024

ACS Appl. Eng. Mater.

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The preparation of boron nitride nanosheets (BNNSs) with high efficiency and low cost has consistently been a primary obstacle, limiting their large-scale applications. In this study, BNNSs with well crystallization were efficiently synthesized at 1000 °C, by using solid state method to efficiently synthesize blocky ZnB 2 O 4 with low melting point as the precursors. This preparation method can achieve a boron source utilization of up to 76% and a single batch yield up to the gram level. In addition, BNNS/Si 3 N 4 microwave-transparent composites were prepared to investigate the potential for large-scale applications of the BNNSs produced by this method. The composite with the addition of 0.5% BNNSs exhibits low bulk density as well as excellent mechanical and microwave-transparent properties, with bulk density, bending strength, fracture toughness, dielectric constant, and loss angle tangent at 18 GHz reaching 2.015 g/cm 3 , 249.61 MPa, 2.89 MPa• m 1/2 , 4.06, and 2.9 × 10 −4 , respectively. Therefore, the low-temperature and high-efficiency preparation of BNNSs by this method provides a simple and dependable method for large-scale application in the field of microwave-transparent materials.

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Section: Resultsmentioning

confidence: 99%

Efficient Preparation of BNNSs and Their Performance Study of Reinforced Porous Si₃N₄ Composites by Gel Casting

Liang,

Bi,

Yin

et al. 2024

ACS Appl. Eng. Mater.

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“…Meanwhile, the mechanical properties can also be improved through the mechanism of crack deflection, crack bridging and grain pullingout effect by successfully introducing Y-α-SiAlON rod-like grains [5,6,36,37]. Table 1 shows the properties of prepared Y-α-SiAlON porous ceramics compared to those of typical high-temperature wave-transmitting materials [16][17][18][38][39][40][41][42].…”

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

High wave transmittance and low thermal conductivity Y– α-SiAlON porous ceramics for high-temperature radome applications

Yang¹,

Xu²,

Guo³

et al. 2023

Journal of Advanced Ceramics

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With the development of hypersonic vehicles technology, ceramic based radome materials are highly demanded due to their high operating temperatures, good dielectric properties, and high mechanical properties. Although α-SiAlON is an ideal material for radome application, its intrinsic low transmittance and high thermal conductivity limit its application. Herein, we prepared Y-α-SiAlON porous ceramics through tert-butanol gel-casting using self-synthesised α-SiAlON powder. Y-α-SiAlON porous ceramics exhibited a uniform micron-level connected pore structure with a porosity of 44.2%-58.6%. The real part of permittivity was 3.13-4.18 (8.2-12.4 GHz), which decreased significantly with increasing porosity. The wave transmittance of the sample with a porosity of 58.6% could exceed 80% in the thickness range of 6-10 mm. The thermal conductivity maintained at a low level of 1.38-2.25 W•m -1 •K -1 owing to the introduction of the pore structure. The flexural strength was 44.75-88.33 MPa, which may be increased by rod-like α-SiAlON grains. The results indicate that the prepared Y-α-SiAlON porous ceramics meet the requirements of high-temperature wave-transmitting materials for radome application.

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Preparation of Si3N4f/Si3N4 wave-transparent composites by vat photopolymerization combined with chemical vapor infiltration

Wang,

Duan,

et al. 2024

Additive Manufacturing

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Tuning the dielectric properties of porous BN/Si3N4 composites by controlling porosity

Cited by 17 publications

References 37 publications

Efficient Preparation of BNNSs and Their Performance Study of Reinforced Porous Si₃N₄ Composites by Gel Casting

Efficient Preparation of BNNSs and Their Performance Study of Reinforced Porous Si₃N₄ Composites by Gel Casting

High wave transmittance and low thermal conductivity Y– α-SiAlON porous ceramics for high-temperature radome applications

Preparation of Si3N4f/Si3N4 wave-transparent composites by vat photopolymerization combined with chemical vapor infiltration

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Tuning the dielectric properties of porous BN/Si3N4 composites by controlling porosity

Cited by 17 publications

References 37 publications

Efficient Preparation of BNNSs and Their Performance Study of Reinforced Porous Si3N4 Composites by Gel Casting

Efficient Preparation of BNNSs and Their Performance Study of Reinforced Porous Si3N4 Composites by Gel Casting

High wave transmittance and low thermal conductivity Y– α-SiAlON porous ceramics for high-temperature radome applications

Preparation of Si3N4f/Si3N4 wave-transparent composites by vat photopolymerization combined with chemical vapor infiltration

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Efficient Preparation of BNNSs and Their Performance Study of Reinforced Porous Si₃N₄ Composites by Gel Casting

Efficient Preparation of BNNSs and Their Performance Study of Reinforced Porous Si₃N₄ Composites by Gel Casting