Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Electrical Transport and Joule Heating of ZrB2 Network in SiC Matrix

  • Kim, Jung-Hun (Division of Materials Science and Engineering, Hanyang University) ;
  • Kim, Chang-Yeoul (Nano-Convergence Material Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Choi, Sung-Churl (Division of Materials Science and Engineering, Hanyang University)
  • Received : 2018.04.26
  • Accepted : 2018.08.22
  • Published : 2018.09.30
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Abstract

To control the electrical properties of a SiC heating element, we sintered $SiC-ZrB_2$composites by using the spark plasma sintering method. The addition of $ZrB_2$ particles with lower electrical conductivity to the SiC matrices with comparatively higher electrical resistivity lowers the electrical resistivities of the composite material. The $ZrB_2$ particles aggregate to form large particles and 3-1, 3-2, and 3-3 networks, i.e., conduction paths. In our study, about $1-{\mu}m$-sized $ZrB_2$ powders start to form the conduction path at about 10 vol.% of addition, namely the threshold volume. The Joule heating experiment shows that 20 vol.% $ZrB_2$-added SiC heating element has outstanding heating efficiency.

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References

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