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Effect of composition on the dielectric properties and thermal conductivity of α-SiAlON ceramics

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Abstract

In this study, a series of dense Ym/3Si12-(m+n)Alm+nOnN16-n (m = 1.1–1.5, n = 1.0) ceramics were prepared by hot-pressing at 1900 °C for 1 h. The effects of composition on the thermal conductivity, dielectric, and wave-transparent properties of Y-α-SiAlON ceramics were investigated. The X-ray diffraction (XRD) results showed that all ceramic samples exhibited a pure α-SiAlON phase. The dielectric properties of Y-α-SiAlON at 1 kHz–120 MHz and 8.2–12.4 GHz were investigated. The results indicate that a smaller m value leads to weaker ion and interfacial polarisations, resulting in a lower dielectric constant. The three-dimensional relationship between microwave transmittance, frequency, and sample thickness was calculated by simulation, and the results showed that Y0.40Si9.8Al2.2O1.0N15.0 had the best wave-transparent properties. The thermal conductivity of the Y-α-SiAlON ceramics showed a decreasing trend with increasing m value and temperature. The single-phase dense Y0.50Si9.5Al2.5O1.0N15.0 exhibited the minimum thermal conductivity, which was 9.75–5.21 W/m·K (20–1000 °C). Therefore, Y-α-SiAlON ceramics are expected to be promising high-temperature window materials owing to their excellent thermal insulation and wave-transparent properties.

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Funding

This work was supported by the International Cooperation Foundation of Shaanxi Province, China (No. 2022KW-34), the Fundamental Research Funds for the Central Universities (No. D5000210722), the National Natural Science Foundation of China (No. 52072301), State Key Laboratory of New Ceramic and Fine Processing Tsinghua University (No. KFZD202102), State Key Laboratory of Solidification Processing (NPU) (No. 2021-TS-08), the China-Poland International Collaboration Fund of National Natural Science Foundation of China (No. 51961135301). We would like to acknowledge the Analytical & Testing Centre of Northwestern Polytechnical University for the XRD, SEM, and other analyses.

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Authors and Affiliations

  1. State 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

    Jia Guo, Jie Xu, Runwu Yang & Feng Gao

  2. NPU-QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an, 710072, China

    Jie Xu, Haixue Yan & Feng Gao

  3. School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK

    Kan Chen & Haixue Yan

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  1. Jia Guo
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Contributions

JG and RWY: performed the experiment and manuscript preparation. JX and KC: contributed significantly to analysis and manuscript preparation. HXY and FG: helped perform the analysis with constructive discussions.

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Correspondence to Jie Xu or Feng Gao.

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Guo, J., Xu, J., Yang, R. et al. Effect of composition on the dielectric properties and thermal conductivity of α-SiAlON ceramics. J Mater Sci: Mater Electron 33, 22480–22491 (2022). https://doi.org/10.1007/s10854-022-09026-7

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