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Effect of hot-pressing sintering on thermal and electrical properties of AlN ceramics with impedance spectroscopy and dielectric relaxations analysis

机译:热压烧结对AlN陶瓷热和电性能的影响,阻抗光谱和介电松弛分析

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摘要

The effects of hot-pressing sintering on the phase composition, microstructure, thermal and electrical properties of AlN ceramics with CeO2-CeF3 additives were studied. During hot-pressing sintering, high pressure reduced the grain boundary phase CeAlO3 and decreased the concentration of oxygen in AlN ceramics. The hot-pressing sintered AlN samples had a much higher thermal conductivity of 191.9 W/m.K than pressureless sintered ones because of the great reduction of grain boundary phases and oxygen impurities in AlN ceramic. As the carbon content in hot-pressing sintered sample was very high, carbon contamination led to the decrease in electrical resistivity and changes in polarization mechanisms for AlN ceramics. The relaxation peak in the dielectric temperature spectrum with an activation energy of 0.64 eV for hot-pressing sintered samples was caused by electrons from free carbon at low temperature. Overall, hot-pressing sintering can effectively increase the thermal conductivity and change the electrical properties of AlN ceramics.
机译:研究了热压烧结对AlN陶瓷与CEO2-CEF3添加剂的相组成,微观结构,热和电性能的影响。在热压烧结期间,高压降低了晶界相CealO3并降低了AlN陶瓷中的氧气浓度。热压烧结AlN样品的导热率高于无气烧结的导热率,因为AlN陶瓷中的晶粒边界阶段和氧杂质的大大降低。随着热压烧结样品中的碳含量非常高,碳污染导致了ALN陶瓷的电阻率降低和偏振机构的变化。具有0.64eV的激活能量的介电温度光谱中的弛豫峰是由低温下游离碳的电子引起的0.64eV。总的来说,热压烧结可以有效地提高导热系数并改变ALN陶瓷的电性能。

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  • 作者单位

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Sch Opt &

    Elect Informat 1037 Luoyu Rd Wuhan 430074 Hubei Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 陶瓷工业;
  • 关键词

    Aluminum nitride (AlN); Hot-pressing sintering; Thermal conductivity; Dielectric relaxation; Impedance spectroscopy;

    机译:氮化铝(ALN);热压烧结;导热率;介电松弛;阻抗光谱;

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