Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Microstructure and PTCR Characteristics of Porous BaTiO3-based Ceramics Prepared by Adding Carbon Black

카본블랙을 첨가하여 제조한 다공성 BaTiO3계 세라믹스의 미세구조 및 PTCR 특성 변화

  • Lee, Ki-Ju (School of Materials Science and Engineering, Inha University) ;
  • Tang, Dongxu (School of Materials Science and Engineering, Inha University) ;
  • Cho, Won-Seung (School of Materials Science and Engineering, Inha University)
  • 이기주 (인하대학교 신소재공학부) ;
  • 당동욱 (인하대학교 신소재공학부) ;
  • 조원승 (인하대학교 신소재공학부)
  • Received : 2011.01.03
  • Accepted : 2011.02.08
  • Published : 2011.02.28
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Abstract

As a pore precursor, carbon black with different content of 0 to 60 vol% were added to (Ba,Sr)$TiO_3$ powder. Porous (Ba,Sr)$TiO_3$ ceramics were prepared by pressureless sintering at $1350^{\circ}C$ for 1h under air. Effects of carbon black content on the microstructure and PTCR characteristics of porous (Ba,Sr)$TiO_3$ ceramics were investigated. The porosity of porous (Ba,Sr)$TiO_3$ ceramics increased from 6.97% to 18.22% and the grain size slightly decreased from $7.51\;{\mu}m$ to $5.96\;{\mu}m$ with increasing carbon black contents. PTCR jump of the (Ba,Sr)$TiO_3$ ceramics prepared by adding carbon black was more than $10^5$, and slightly increased with increasing carbon black. The PTCR jump in the (Ba,Sr)$TiO_3$ ceramics prepared by adding 40 vol% carbon black showed an excellent value of $9.68{\times}10^5$, which was above two times higher than that in (Ba,Sr)$TiO_3$ ceramics. These results correspond with Heywang model for the explanation of PTCR effect in (Ba,Sr)$TiO_3$ ceramics. It was considered that carbon black is an effective additive for preparing porous $BaTiO_3$ based ceramics. It is believed that newly prepared (Ba,Sr)$TiO_3$ cermics can be used for PTC thermistor.

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