Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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A Study on the Thermal Resistance Strength with the Formation of the Zircon Phase in LAS System

$Li_2O-Al_2O_3-SiO_2$계 소지내에 Zircon상 형성에 따른 내열 강화 특성

  • 전덕일 (한양대학교 무기재료공학과) ;
  • 김정욱 (한양대학교 무기재료공학과) ;
  • 이응상 (한양대학교 무기재료공학과)
  • Published : 1992.12.01
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Abstract

The LAS system with good thermal properties has a narrow range of firing and sintering temperature near the melting point. So it is difficult to sinter LAS to dense sintered body. In this study, the petalite (Li2O.Al2O3.8SiO2) with good thermal properties, was taken as a base composition, and zironia was added in this composition to broaden the firing range, increase the mechanical strength, and control the thermal expansion. The thermal and mechanical properties were investigated. The results are as follows; 1. Zirconia phase was formed in LAS matrix and apparent porosity was decreased from 0.9% to 0.5%, and the mechanical strength was kincreased from 112 MPa to 190 MPa, by the densification of body. 2. The composition Li2O.Al2O3.8SiO2 has a negative thermal expansion, but the thermal expansion was changed from negative to positive with the densification and the increase of amount of synthesized zircon phase which had positive thermal expansion. The coefficient of thermal expansion, with the increase of the amount of additives, was low as -0.74~9.06$\times$10-7/$^{\circ}C$ in 20~$600^{\circ}C$, and 7.95~20.13$\times$10-7/$^{\circ}C$ in 20~80$0^{\circ}C$. 3. The mechanical strength of LZ15 (added with ZrO2.SiO2 15 wt%) composition thermal-shocked was stable in the temperature range of 0~$600^{\circ}C$, but rapidly decreased due to the increase of thermal expansion above $600^{\circ}C$.

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References

  1. セラミンクス v.14 低膨脹セラミソクス 宇田川 重和;井川 博行
  2. J. Am. Ceram. Soc. v.71 The System Lithium Metasilicatespodume-Silica Rustum Roy;E. F. Osborn
  3. J. Am. Ceram. Soc. v.33 Compositional and Stability Relationship among the Lithium Aluminosilicate Rustum Roy;E. F. Osborn;Della M. Roy
  4. J. Am. Ceram. Soc. v.33 Observation on the Thermal Expansion of Crystalline and Glassy Substances F. A. Hummel
  5. J. Am. Ceram. Soc. v.34 Thermal Expansion Properties of Some Synthetic Lithia Minerals F. A. Hummel
  6. J. Am. Ceram. Soc. v.51 Thermal Expansion of Synthetic β-Spodumene and β-Spodumene-Silica Solid Solutions W. Ostertag;G. R. Fischer;J. P. William
  7. J. Am. Ceram. Soc. v.72 Sinterable β-Spodumene Glass Ceramics Sarah Knickerbocker;Michell R. Tuzzolo;Samuel Lauhorne
  8. Journal of Mat. Sci. v.17 SiC Fiber reinforced Glass-Ceramic Matrix Composite Exhibiting High Strength and Toughness John. J. Brennan;M. Prewo
  9. J. Am. Ceram. Soc. v.72 Effect of Interface mechanical Properties on Pullout in a SiC-Fiber-Reinforced LAS Glass-Ceramic Michalel D Thouless;Orfeo Sbaizero;Lorenz S Sigl;Anthony G. Evans
  10. 제1회 Conference세라믹장갑재료 Sol-Gel Process로 합성한 LAS Sol의 Rheology와 SiC Fiber에의 코팅 특성 장현명
  11. セラミソクスの製造 プロセス 窯業協會編輯委員會講座小委員會
  12. Am. Ceram. Soc. Bulletin v.45 Esperimental Evidence for Thermal Shock Damage Resistance J. Nakayama;M. Ishizuka
  13. J. Am. Ceram. Soc. v.52 Unified Theory of Thermal Shock Fracture Initation and Crack Propergation D. P. H. Hasselman