엽납석을 활용한 저열팽창 코디어라이트 세라믹스 합성

김동민; 정숙인; 이훈철; Dong-Min Kim; Sook-In Jung; Hun-Chul Lee; 이상진

Korean Journal of Materials Research, Vol.25, No.7, 330-335, July, 2015

DOI10.3740/MRSK.2015.25.7.330 Export Citation

엽납석을 활용한 저열팽창 코디어라이트 세라믹스 합성

Synthesis of Low-Thermal-Expansion Cordierite Ceramics Prepared from Pyrophyllite

김동민¹, 정숙인², 이훈철³, ^{1, 2, †}

¹국립목포대학교 신소재공학과
²국립목포대학교 세라믹산업기술연구소
³(주)세원하드페이싱 연구소

Dong-Min Kim¹, Sook-In Jung², Hun-Chul Lee³, and 이상진^{1, 2, †}

¹Department of Advanced Materials Science and Engineering, Mokpo National University, Muan 534-729, Korea
²Research Institute of Ceramic Industry and Technology, Mokpo National University, Muan 534-729, Korea
³Research Center, Sewon Hardfacing Co., Ltd, Mokpo 530-370, Korea

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A low thermal expansion ceramic, cordierite (2MgO·2Al2O3·5SiO2), was synthesized using pyrophyllite. Pyrophyllite usually consists of SiO2 and Al2O3, which are the main components of cordierite. MgCO3 and Al(OH)3 were added in various amounts to pyrophyllite and fired for synthesis and sintering. α-cordierite crystallized from 1000 oC with mixing of 20 wt% MgCO3 and 1.7 wt% Al(OH)3, and un-reacted cristobalite was also detected with the cordierite. As the temperature was increased to 1400 oC, the cordierite yield was gradually increased. Powder compacts of the synthesized cordierite were sintered between 1250 oC ~ 1400 oC; the sintered samples showed a low thermal expansion coefficient of 2.1 × 10.6/ oC 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:pyrophyllite;cordierite;synthesis;thermal expansion coefficient;sintering

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[13] Beal RJ, Cooke RL, J. Am. Ceram. Soc., 35(2), 53 (1952)