Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Mullite Formation and Effect in Porcelain Body by Replacing Kaolinite with Pyrophyllite

납석으로 카올린을 대체한 도자기 소지의 뮬라이트 형성과 특성

  • 곽안나 (한국세라믹기술원 도자세라믹센터) ;
  • 김근희 (한국세라믹기술원 도자세라믹센터) ;
  • 피재환 (한국세라믹기술원 도자세라믹센터) ;
  • 김종영 (한국세라믹기술원 도자세라믹센터) ;
  • 조우석 (한국세라믹기술원 도자세라믹센터) ;
  • 김경자 (한국세라믹기술원 도자세라믹센터) ;
  • 이종근 (대한세라믹스 주식회사)
  • Received : 2011.10.17
  • Accepted : 2012.04.27
  • Published : 2012.05.31
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Abstract

Mullite formation in a porcelain body was promoted extensively by replacing kaolinite with pyrophyllite. Effects of mullite formation and vitrification by substitution of kaolinite with pyrophyllite on the mechanical and thermal properties were investigated. Addition of 45-55% pyrophyllite (pyrophyllite (45-55%)-feldspar (30%)-Gairome clay (20%)) could vitrify the sintered samples (water absorption : 0.05%, bulk density : 2.66g/cc) and improve the flexural strength (122MPa) when fired at $1280^{\circ}C$. Mullite formation was found to be decreased with increasing content of pyrophyllite. On the contrary, beyond 50% of pyrophyllite quartz and cristobalite phases was found to be increased. Thermal expansion coefficient of the samples decreased with increase of mullite phase. In triaxial system of pyrophyllite-feldspar-clay, the mullite formation of the samples with 50% pyrophyllite reaches about 78.7% and thermal expansion coefficient was found to be $5.4{\times}10^{-6}/K$.

Keywords

References

  1. S. M. Koh, "Suggestion on Quality Specifications of Domestic Pyrophyllite According to Utilization (in Korean)," J. Miner. Soc. Kor., 20 [1] 61-70 (2007).
  2. K. H. Lee, "Supply and Demand Analysis of Pyrophyllite (in Korean)," J. Miner. Soc. Kor., 15 [1] 15-24 (2002).
  3. H. G. Jho, "Pyrophyllite Application (in Korean)," J. Miner. Soc. Kor., 13 [1] 28-38 (2000).
  4. S. J. Lee, Y. J. Kim, and H. S. Moon, "Phase Transformation Sequence from Kaolinite to Mullite Investigated by an Energy-Filtering Transmission Electron Microscope," J. Am. Ceram. Soc., 82 [10] 2841-48 (1999).
  5. S. J. Lee, Y. J. Kim, and H. S. Moon, "An Investigation of the Transfotmation Sequence from Pyrophyllite to Mullite by EF-TEM (in Korean)," J. Kor. Ceram. Soc., 38 [2] 199-206 (2001).
  6. C. J. Jung, H. J. Jung, and S. Y. Yang, "Preparation of Machinable Ceramics Using Domestic Pyrophyllite (in Korean)," J. Kor. Ceram. Soc., 28 [7] 531-40 (1991).
  7. T. K. Mukhopadhyay, Syamal Ghosh, S. Ghatak and H. S. Maiti, "Effect of Pyrophyllite on Vitrification and on Physical Properties of Triaxial Porcelain," Ceram. Int., 32 871-76 (2006). https://doi.org/10.1016/j.ceramint.2005.07.002
  8. C. J. Jung, N. I. Kim, and K. Y. Oh, "Effect of Alkali Oxides on the Cristobalitization of Quartz in Whiteware Body (in Korean)," J. Kor. Ceram. Soc., 29 [12] 981-89 (1992).
  9. T. K. Mukhopadhyay, S. Ghatak, and H.S. Maiti, "Effect of Pyrophyllite on the Mullitization in Triaxial Porelain System," Ceram. Int., 35 1493-500 (2009). https://doi.org/10.1016/j.ceramint.2008.08.002
  10. Z. Mattyasovszky, "Mechanical Strength of Porcelain," J. Am. Ceram. Soc., 40 [9] 299-306 (1957). https://doi.org/10.1111/j.1151-2916.1957.tb12626.x
  11. B. S. Kim, D. Y. Lee, H. K. Kim, and J. W. Jang, "The Decision on the Thermal Expansion Coefficient of the Glass Infiltrated in All Ceramic Crown (in Korean)," J. Kor. Ceram. Soc., 40 [1] 93-7 (2003). https://doi.org/10.4191/KCERS.2003.40.1.093

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