Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis of Low-Thermal-Expansion Cordierite Ceramics Prepared from Pyrophyllite

엽납석을 활용한 저열팽창 코디어라이트 세라믹스 합성

  • Kim, Dong-Min (Department of Advanced Materials Science and Engineering, Mokpo National University) ;
  • Jung, Sook-In (Research Institute of Ceramic Industry and Technology, Mokpo National University) ;
  • Lee, Hun-Chul (Research Center, Sewon Hardfacing Co., Ltd.) ;
  • Lee, Sang-Jin (Department of Advanced Materials Science and Engineering, Mokpo National University)
  • 김동민 (국립목포대학교 신소재공학과) ;
  • 정숙인 (국립목포대학교 세라믹산업기술연구소) ;
  • 이훈철 ((주)세원하드페이싱 연구소) ;
  • 이상진 (국립목포대학교 신소재공학과)
  • Received : 2015.05.11
  • Accepted : 2015.06.24
  • Published : 2015.07.27
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Abstract

A low thermal expansion ceramic, cordierite ($2MgO{\cdot}2Al_2O_3{\cdot}5SiO_2$), was synthesized using pyrophyllite. Pyrophyllite usually consists of $SiO_2$ and $Al_2O_3$, which are the main components of cordierite. $MgCO_3$ and $Al(OH)_3$ were added in various amounts to pyrophyllite and fired for synthesis and sintering. ${\alpha}$-cordierite crystallized from $1000^{\circ}C$ with mixing of 20 wt% $MgCO_3$ and 1.7 wt% $Al(OH)_3$, and un-reacted cristobalite was also detected with the cordierite. As the temperature was increased to $1400^{\circ}C$, the cordierite yield was gradually increased. Powder compacts of the synthesized cordierite were sintered between $1250^{\circ}C{\sim}1400^{\circ}C$; the sintered samples showed a low thermal expansion coefficient of $2.1{\times}10^{-6}/^{\circ}C$ and typical sintering behavior. It is anticipated that it will be possible to synthesize cordierite ceramics on a mass production scale using the mineral pyrophyllite.

Keywords

References

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Cited by

  1. Preparation of Granule Powders for Thermal Spray Coating by Utilization of Pyrophyllite Minerals vol.53, pp.5, 2016, https://doi.org/10.4191/kcers.2016.53.5.557