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J. Korean Ceram. Soc. > Volume 30(5); 1993 > Article
Journal of the Korean Ceramic Society 1993;30(5): 381.
$Li_2O-Al_2O_3-SiO_2$계 소지의 Mullite 첨가에 의한 열적, 기계적 특성에 관한 연구
최도문, 유재근, 이응상
한양대학교 무기재료공학과
Thermal, Mechanical Properties of LAS with the Addition of Mullite
ABSTRACT
Due to the anisotropy of thermal expansion, LAS system which has low thermal expansion property is hard to obtain a dense sintered body. Therefore, the thermal expansion coefficient and the mechanical strength were decreased. In this study, mullite, which has good mechanical properties in high temperature and comparatively low thmeral expansion coefficient, was taken as a additive in LAS system. And then, sintering, thermal, and mechanical properties were investigated. The results are follows; When mullite is added in eucryptite composition (Li2O.Al2O3.2SiO2) of LAS system, the creation of liquid phase results in the densification of sintered body and the specimen sintered at 136$0^{circ}C$ for 2 hours shows optimum sintering condition. With the addition of mullite in eucryptite composition, mechanical strength is increased by the control of grain growth. Especially, flexual strength of EM0 specimen was about double value than the basic composition. Thermal expansion coefficients of EM0 and EM15 specimens sintered at 136$0^{circ}C$ were -8.23$times$10-6/$^{circ}C$ and -4.90$times$10-6/$^{circ}C$ in the temperature range of RT.~80$0^{circ}C$. As the mullite content are increased, negative thermal expansion ratios are decreased.
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