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The effect of graphite addition on thermal conductivity, microstructure, and electrochemical impedance spectroscopy of AlN ceramics

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Abstract

Graphite/aluminum nitride (AlN) multiphase ceramics are pressureless sintered under 1850 °C using Dy2O3 and CaF2 as sintering additives. The effects of added graphite on microstructure, thermal conductivity, and electrochemical impedance spectroscopy of AlN ceramics were investigated. It was found that with 1wt% graphite addition the thermal conductivity of AlN in the through-plane to can achieve 210 W/(m K), which 25% higher than that of AlN without graphite. The graphite addition eliminates the oxygen impurity in AlN by a carbon reduction reaction in form of nanosized Dy2O3 particles. From electrochemical impedance spectroscopy manifested that the activation energy (Ea,g) of samples in grains is increased from 0.784 to 1.112 eV, suggesting that the concentrations of defects and impurities of Graphite/AlN multiphase ceramics are lower than those of monophase AlN ceramics.

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The authors declare that all data supporting the findings of this study are available within this published article.

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Acknowledgments

The authors acknowledge the Loughborough Materials Characterization Centre (LMCC) for providing the characterization facilities. This work was supported by the Shanghai Municipal Natural Science Foundation, China (Granted No.19ZR1418500).

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  1. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China

    Tun Wang, Jianjun Xie, Lei Zhang, Tao Lu, Maomao Ding, Lingcong Fan & Ying Shi

  2. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai, 200235, China

    Ding Zhou

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Wang, T., Xie, J., Zhang, L. et al. The effect of graphite addition on thermal conductivity, microstructure, and electrochemical impedance spectroscopy of AlN ceramics. Journal of Materials Research 37, 2749–2760 (2022). https://doi.org/10.1557/s43578-022-00633-y

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