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首页> 外文期刊>RSC Advances >Boron carbide composites with highly aligned graphene nanoplatelets: light-weight and efficient electromagnetic interference shielding materials at high temperatures
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Boron carbide composites with highly aligned graphene nanoplatelets: light-weight and efficient electromagnetic interference shielding materials at high temperatures

机译：碳化硼复合材料具有高度对齐的石墨烯纳米键：在高温下轻质和有效的电磁干扰屏蔽材料

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摘要

B4C-based ceramic composites containing 0-2 vol% highly aligned graphene nanoplatelets (GNPs) are fabricated. The electromagnetic interference (EMI) shielding properties of the obtained composites are investigated at X-band (8.2-12.4 GHz) frequency range from room-temperature up to 800 degrees C. All composites exhibit outstanding EMI shielding properties with satisfactory frequency- and thermal-stability. The shielding effectiveness (SE) of GNP/B4C composites increases monotonically with increasing GNP loading. Superior room-temperature SE close to 40 dB is achieved with only 2 vol% GNPs and high SE around 35 dB still persists at 800 degrees C. Considering their relatively low density, GNP/B4C composites possess a high specific shielding effectiveness (SSE) of 16 dB cm(3) g(-1) which is among the highest values in reported ceramic-based shielding composites. Especially, the GNP/B4C composite with 2 vol% GNPs exhibits the highest SSE/t (SSE divided by thickness) values at temperatures above 200 degrees C for all reported shielding composites, indicating that GNP/B4C composites belong to the most promising high-temperature shielding composites. The excellent shielding properties of GNP/B4C composites arise mainly from the high electrical conductivity, high dielectric loss and the multiple reflections by the highly aligned and large-sized GNP layers.
机译：制造含有0-2体积高度高度对准的石墨烯纳米纳薄纳米片（GNPS）的B4C基陶瓷复合材料。在X波段（8.2-12.4GHz）频率范围内研究得到的复合材料的电磁干扰（EMI）屏蔽性能，从室温高达800℃。所有复合材料都具有令人满意的频率和热 - 稳定。 GNP / B4C复合材料的屏蔽效能（SE）随着GNP负载的增加而单调增加。高级室温Se接近40 dB，只有2 Vol％GNPS，高约35 dB仍然存在于800摄氏度仍然存在。考虑到它们的相对低密度，GNP / B4C复合材料具有高特定的屏蔽效果（SSE） 16dB cm（3）g（-1），其是报告基于陶瓷的屏蔽复合材料的最高值之​​一。特别地，对于所有报告的屏蔽复合材料，具有2 Vol％GNP的GNP / B4C复合材料在高于200摄氏度的温度下，在高于200℃的温度下表现出最高的SSE / T（SSE除以厚度）值，表明GNP / B4C复合材料属于最有前途的高度 - 温度屏蔽复合材料。 GNP / B4C复合材料的优异屏蔽性能主要来自高电导和大型GNP层的高电导率，高介电损耗和多重反射。

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  • 来源
    《RSC Advances》 |2018年第69期|共7页
  • 作者

    Tan Y. Q.; Luo H.; Zhou X. S.; Peng S. M.; Zhang H. B.;

  • 作者单位

    China Acad Engn Phys Inst Nucl Phys &

    Chem Innovat Res Team Adv Ceram Mianyang 621900 Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem Innovat Res Team Adv Ceram Mianyang 621900 Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem Innovat Res Team Adv Ceram Mianyang 621900 Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem Innovat Res Team Adv Ceram Mianyang 621900 Peoples R China;

    China Acad Engn Phys Inst Nucl Phys &

    Chem Innovat Res Team Adv Ceram Mianyang 621900 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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