Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Si Addition on Resistivity of Porous SiC-Si Composite for Heating Element Application

다공성 SiC-Si 복합체의 전기비저항에 미치는 Si 첨가량의 영향

  • Jun, Shinhee (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Wonjoo (Research Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Kong, Young-Min (School of Materials Science and Engineering, University of Ulsan)
  • 전신희 (울산대학교 첨단소재공학부) ;
  • 이원주 (한국화학연구원 그린정밀화학연구센터) ;
  • 공영민 (울산대학교 첨단소재공학부)
  • Received : 2015.04.30
  • Accepted : 2015.05.14
  • Published : 2015.05.27
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Abstract

To fabricate porous SiC-Si composites for heating element applications, both SiC powders and Si powders were mixed and sintered together. The properties of the sintered SiC-Si body were investigated as a function of SiC particle size and/or Si particle contents from 10 wt% to 40 wt%, respectively. Porous SiC-Si composites were fabricated by Si bonded reaction at a sintering temperature of $1650^{\circ}C$ for 80 min. The microstructure and phase analysis of SiC-Si composites that depend on Si particle contents were characterized using scanning electron microscope and X-ray diffraction. The electrical resistivity of SiC-Si composites was also evaluated using a 4-point probe resistivity method. The electrical resistivity of the sintered SiC-Si body sharply decreased as the amount of Si addition increased. We found that the electrical resistivity of porous SiC-Si composites is closely related to the amount of Si added and at least 20 wt% Si are needed in order to apply the SiCSi composites to the heating element.

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References

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