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Preparation and Dielectric Properties of Si_3N_4/BN(CB) Composite Ceramic

机译：Si_3N_4 / BN（CB）复合陶瓷的制备及介电性能

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摘要

Si_3N_4ano-carbon black (CB) composite ceramics with boron nitride (BN) as interphase were fabricated by gelcasting. The results of scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed that the structures of BN interphase and BN coated CB were formed and were uniform distributed in the Si_3N_4 ceramic. The permittivity (ε'ε") of BN-coated CB was obviously lower than that of the pure CB, and the impedance of the BN-coated CB particles was close to the Z_0 (Z_0 = 1, Z_0 is impedance under vacuum) compared with that of the CB particles; therefore, electromagnetic wave can enter into the BN-coated CB particles and be dissipated due to the high conductivity of CB particles. When incorporating the BN (CB) into Si_3N_4 substrate, the electromagnetic wave can pass through Si_3N_4ano-CB composite ceramics easily and be absorbed by CB, so the tgδ of the composite ceramic increased as the mass content of BN(CB) increased. The tgδ of the composite ceramic was about 0.43 when the content of BN(CB) increased to 15 wt%.
机译：通过凝胶浇铸法制备了以氮化硼（BN）为界面相的Si_3N_4 /纳米炭黑（CB）复合陶瓷。扫描电子显微镜（SEM）和X射线衍射（XRD）的结果表明，在Si_3N_4陶瓷中形成了BN相间结构和BN包覆的CB，并均匀分布。 BN包覆的CB的介电常数（ε'ε“）明显低于纯CB的介电常数，并且BN包覆的CB颗粒的阻抗接近Z_0（Z_0 = 1，Z_0是真空下的阻抗）因此，电磁波可以进入覆有BN的CB粒子中，并且由于CB粒子的高导电性而被消散；当将BN（CB）掺入Si_3N_4基板时，电磁波可以穿过Si_3N_4 / nano-CB复合陶瓷容易被CB吸收，因此随着BN（CB）含量的增加，复合陶瓷的tgδ增加；当BN（CB）的含量增加时，复合陶瓷的tgδ约为0.43。至15重量％。

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  • 来源
    《High temperature materials and processes》 |2016年第5期|523-529|共7页
  • 作者

    Xiao Weiling; Xiao Peng; Luo Heng; Zhou Wei; Li Yang;

  • 作者单位

    State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China Wuhan Electromagnetism Ltd. Company of China Aerospace Science and Industry Corporation, Wuhan 430074, China;

    State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;

    State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;

    State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;

    State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nano-carbon black; boron nitride; coating; Si_3N_4; dielectric property;

    机译：纳米炭黑;氮化硼涂层;Si_3N_4;介电性能;

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