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

Runwu Yang; Jie Xu; Jia Guo; Xuanyu Meng; Ping Zhang; Fengying Fan; Yanan Qu; Feng Gao

doi:10.26599/JAC.2023.9220756

Journal of Advanced Ceramics 2023, 12(6): 1273-1287 https://doi.org/10.26599/JAC.2023.9220756

Research Article |

Open Access | Issue | Published: 29 May 2023

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

Show Author's Information Hide Author's Information Runwu Yang^{^a}, Jie Xu^{^a^,^b}(

), Jia Guo^{^a}, Xuanyu Meng^{^a}, Ping Zhang^{^a}, Fengying Fan^{^a}, Yanan Qu^{^c}, Feng Gao^{^a^,^b}

aState Key Laboratory of Solidification Processing, MIIT Key Laboratory of Radiation Detection Materials and Devices, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China

bNPU–QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an 710072, China

cRailway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China

Keywords:

flexural strength, thermal conductivity, α-SiAlON, porous ceramics, wave-transmittance materials

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Yang R, Xu J, Guo J, et al. High wave transmittance and low thermal conductivity Y–α-SiAlON porous ceramics for high-temperature radome applications. Journal of Advanced Ceramics, 2023, 12(6): 1273-1287. https://doi.org/10.26599/JAC.2023.9220756

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Abstract

With the development of hypersonic vehicle 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 applications, its intrinsic low transmittance and high thermal conductivity limit its applications. Herein, we prepared Y–α-SiAlON porous ceramics through tert-butanol (TBA) gel-casting using the self-synthesized α-SiAlON powder. The Y–α-SiAlON porous ceramics exhibited a uniform micron-level connected pore structure with the porosity (P) of 44.2%–58.6%. The real part of permittivity ( $ε^{'}$ ) was 3.13–4.18 (8.2–12.4 GHz), which decreased significantly with the increasing porosity. The wave transmittance ( $| T |^{2}$ ) of the sample with porosity of 58.6% could exceed 80% in the thickness range of 6–10 mm. The thermal conductivity was 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 44.73–88.33 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 applications.

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

Show Author's information Hide Author's Information Runwu Yang^{^a}, Jie Xu^{^a^,^b}(

), Jia Guo^{^a}, Xuanyu Meng^{^a}, Ping Zhang^{^a}, Fengying Fan^{^a}, Yanan Qu^{^c}, Feng Gao^{^a^,^b}

bNPU–QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an 710072, China

cRailway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China

Abstract

Keywords: flexural strength, thermal conductivity, α-SiAlON, porous ceramics, wave-transmittance materials

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Publication history

Received: 06 February 2023

Revised: 14 April 2023

Accepted: 16 April 2023

Published: 29 May 2023

Issue date: June 2023

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Acknowledgements

This work was supported by the International Cooperation Foundation of Shaanxi Province, China (No. 2022KW-34), the National Natural Science Foundation of China (Nos. 52072301, 51908551, and 52272123), State Key Laboratory of New Ceramics & Fine Processing, Tsinghua University (No. KFZD202102), the Fundamental Research Funds for the Central Universities (No. D5000210722), Guangxi Science and Technology Plan Project (No. Gui Ke AB22035043), and State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology (No. P2023-003). We would like to acknowledge the Analytical & Testing Center, Northwestern Polytechnical University for the XRD, SEM, and other analyses.

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