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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References

  1. H. Emoto and J. Hojo: J. Ceram. Soc. Jpn., 100 (1992) 555. https://doi.org/10.2109/jcersj.100.555
  2. H. Nagamoto, H. Kagotani and T. Okubo: J. Am. Ceram. Soc., 76 (1993) 2053. https://doi.org/10.1111/j.1151-2916.1993.tb08332.x
  3. I. C. Ho and H. L. Hsieh: J. Am. Ceram. Soc., 76 (1993) 2385. https://doi.org/10.1111/j.1151-2916.1993.tb07784.x
  4. I. C. Ho: J. Am. Ceram. Soc., 77 (1994) 829. https://doi.org/10.1111/j.1151-2916.1994.tb05372.x
  5. H. F. Cheng, T. F. Lin and C. T. Hu: J. Am. Ceram. Soc., 76 (1993) 827. https://doi.org/10.1111/j.1151-2916.1993.tb05302.x
  6. B. C. Lacourse and V. R. W. Amarakoon: J. Am. Ceram. Soc., 78 (1995) 3352. https://doi.org/10.1111/j.1151-2916.1995.tb07976.x
  7. W. Heywang: J. Am. Ceram. Soc., 47 (1964) 484. https://doi.org/10.1111/j.1151-2916.1964.tb13795.x
  8. W. Heywang: J. Mater. Sci., 6 (1971) 1214. https://doi.org/10.1007/BF00550094
  9. P. W. Haaijiman and R. W. Dam: German Patent 929, 350 (1955).
  10. G. H. Jonker: Solid State Electronics, 7 (1964) 895. https://doi.org/10.1016/0038-1101(64)90068-1
  11. M. Kuwabara: J. Am. Ceram. Soc., 64 (1981) 639. https://doi.org/10.1111/j.1151-2916.1981.tb15861.x
  12. T. R. Shrout, D. Moffatt and W. Huebner: J. Mater. Sci., 26 (1991) 145. https://doi.org/10.1007/BF00576045
  13. S. M. Su, L. Y. Zhang, H. T. Sun and X. Yao: J. Am. Ceram. Soc., 77 (1994) 2154. https://doi.org/10.1111/j.1151-2916.1994.tb07111.x
  14. K. J. Lee, D. Tang, K. Park and W. S. Cho: Met. Mater. Int., 16 (2010) 99. https://doi.org/10.1007/s12540-010-0099-3
  15. J. B. Nelson and D. P. Riley: Proc. Phys. Soc., 57 (1945) 160. https://doi.org/10.1088/0959-5309/57/3/302
  16. K. Park: Mat. Sci. Eng., B 107 (2004) 19. https://doi.org/10.1016/j.mseb.2003.10.003
  17. B. Li, X. Wang, L. Li, H. Zhou, X. Liu, X. Han, Y. Zhang, X. Qi and X. Deng: Mat. Chem. Phys., 83 (2004) 23. https://doi.org/10.1016/j.matchemphys.2003.08.009
  18. S. A. Saltykov: Stereometric Metallography (2nd edn), (1958) 446.
  19. P. Bomlai, N. Sirikulrat and T. Tunkasiri: Mater. Lett., 59 (2005) 118.
  20. J. G. Kim, W. P. Tai, Y. J. Kwon, K. J. Lee, W. S. Cho, N. H. Cho, C. M. Whang and Y. C. Yoo: J. Mat. Sci., 15 (2004) 807.
  21. B. Huybrechts, K. Ishizaki and M. Takata: J. Mater. Sci. Rev., 30 (1995) 2463. https://doi.org/10.1007/BF00362121