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J. Korean Ceram. Soc. > Volume 32(2); 1995 > Article
Journal of the Korean Ceramic Society 1995;32(2): 171.
실리케이트 광물을 이용한 내열충격성 LAS계 세라믹스의 제조에 관한 연구 (III) Eucryptite와 Spondumene 소결특성
박한수, 조경식1, 문종수2
홍익대학교 과학기술대 무기재료공학과
1연세대학교 세라믹공학과
2경남대학교 무기재료공학과
The Study on Fabrication of LAS System Ceramics for Thermal Shock Resistance from Silicate Minerals (III) Sintering Characteristics of Eucryptite and Spodumene
ABSTRACT
Five eucryptite and ten spodumene compositional powders were syntehsized from three sillimanite group, two kaolin group, and five pyrophyllite group silicate minerals. Those powders were isotatically pressed and fired at 1200~135$0^{circ}C$ for 2 hrs, and then the sintered bodies were characterized. Silicate minerals with molar ratio of Al2O3 to SiO2 correspond to those of eucryptite and spodumene are kaolin and pyrophyllite group silicate minerals, respectively. Sintering characteristics of eucryptite from kaolin group and spodumene from pyrophyllite group mineral were superior to those from other silicate minerals. Eucryptite sintered bodies with 95~97% relative densities and densified microstructures can be obtained using Hadong pink kaolin as starting materials by sintering over broad temperature zone(1250~135$0^{circ}C$). The eucryptite sintered bodies which were fired at 130$0^{circ}C$ for 2hrs, from Hadong pink kaolin had within 3.0wt% microstructural compositional variations compaired with stoichiometric compound, and had good negative thermal expansiion property with -3.55$times$10-6/$^{circ}C$ thermal expansion coefficient. Spodumene sintered bodies which were prepared from pyrophyllite group silicate minerals, had dense microstructures and high densities by densification through liquid phase sintering with enlarged temperature range. The specimens which were fired at 130$0^{circ}C$ for 2 hrs from Gusipyrophillite, had dense microstructure with crystallines mainly, and low thermal expansion property with 0.62$times$10-6/$^{circ}C$ thermal expansion coefficient. The porous texture and residual glass phase in LAS system ceramics which were prepared from silicate minerals, tend to increase the thermal expansion properties of sintered bodies to positive direction.
Key words: LAS ceramics, Eucryptite, Spodumene, Silicate minerals, Sintering, Microstructure, Thermal expansion coefficient
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