Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Synthesis of Mullite Powder from Alkoxides and the Properties of the Mullite-Zircocnia Composites

알콕사이드로부터 Mullite 분말의 합성 및 Mullite-Zirconia 복합체의 특성

  • 함종근 (연세대학교 공과대학 요업공학과) ;
  • 이홍림 (연세대학교 공과대학 요업공학과)
  • Published : 1990.02.01
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Abstract

The mullite-15v/o ZrO2 composites were prepared by dispersing ZrO2-3m/o Y2O3 powders into the mullite matrix in order to improve the mechanical properties of the mullite. The densification and retention of t-ZrO2 in the matrix of synthetic mullite were also investigated. From IR spectroscopic analysis, the obtained amorphous SiO2-Al2O3 powder was observed to have Si-O-Al chemical bond in its structure which might result in the homogeneous mullite composition. The lattice parameter of the mullite powder calcined above 130$0^{\circ}C$ (a0=7.5468$\AA$) is nearly close to the value of stoichiometric mullite (71.8wt% Al2O3, a0=7.5456$\AA$). The sintering behavior, microstructure, flexural strength and fracture toughness of the mullite and mullite-15v/o ZrO2 composites have been studied. The mullite-15v/o ZrO2(+3m/o Y2O3) ceramics with relative densities of 96% were obtained when sintered at 1$600^{\circ}C$. The flexural strength and fractrue toughness of the composites sintered at 1$600^{\circ}C$(calcination temperature of mullite powders ; 125$0^{\circ}C$) had maximum values of 307MPa and 2.50MPa.m1/2, respectively. The fracture toughness improvement in the mullite-ZrO2 cmoposite is assumed to be resulted from the combined effect of the stress-induced phase transformation of tetragonal ZrO2 and the crack deflection due to microcracking by the monoclinic ZrO2 formation.

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References

  1. J. Am Ceram. Soc. v.68 no.1 Sintering and Mechanical Properties of Stoichiometric Mullite S. Kanzaki;H. Tabata;T. Kumazawa;S. Ohta
  2. Yogyo-Kyokai-Shi v.93 no.7 Dependency of Mechanical Property of Sintered Mullite on Chemical Composition S. Kanzaki;T. Kumazawz;J. Asami;O. Abe;H. Tabata
  3. J. Am. Ceram. Soc. v.65 no.9 Development of Low-Thermal Expansion Mullite Bodies M.H. Leipold;J.D. Sibold
  4. Introduction to Ceramics W.D. Kingery;H.K. Bowen;D.R. Uhlman
  5. J. Am. Ceram. Soc. v.58 no.3-4 Creep of Polycrystalline Mullite P.A. Lessing;R.S. Gordon;K.S. Mazdiyasni
  6. ibid v.60 no.3-4 High-Temperature Mechanical Properties of Mullite under Compression P.C. Dokko;J.A. Pask;K.S. Mazdiyasni
  7. ibid v.63 no.3-4 Mechanical Properties of Sintered, in Situ-Reacted Mullite-Zirconia Composites N. Claussen;J. Jahn
  8. J. Kor. Ceram. Soc. v.26 no.6 알콕사이드로 부터 Mullite 분말의 합성 및 그 특성 Hong-Lim Lee;Jong-keun Ham
  9. J. Am. Ceram. Soc. v.55 no.6 Phase Analysis in Zirconia Systems R.C. Garvie;P.S. Nicholson
  10. ibid v.59 no.7-8 Fracture Toughness Determination by Indentation A.G. Evans;E.A. Charles
  11. ibid v.19 no.9 Characterization of Spinel Phase from SiO₂-Al₂O₃ Xerogels and the Formation Process of Mullite K. Okada;N. Otsuka
  12. ibid v.69 no.10 Characterization of Spinel Phase Formed in the Kaolin-Mullite Thermal Sequence K. Okada;N. Otauka;J. Ossaka
  13. ibid v.55 no.2 Infrared Frequency Calculations for Ideal Mullite(3Al₂O₃-2SiO₂) K.J.D. Mackenzie
  14. J. Mater. Sci. v.24 The Origins of Mullite Formation I.M. Low;R. Mcpherson
  15. J. Am. Ceram. Soc. v.72 no.6 Characterization and Sintering Behavior of Alkoxide-Derived Aluminosilicate Powders Y. Hirata;K. Sakeda;Y. Matsushita;K. Shimada;Y. Ishihara
  16. ibid v.62 no.3-4 Formation of Silicon-Aluminium Spinel A.K. Chakraborty
  17. ibid v.70 no.3 Crystallization Behavior of Al₂O₃ in the Presence of SiO₂ A.K. Chakraborty;D.K. Ghosh
  18. Yogyo-kyokai-Shi v.93 no.1 Property of SiO₂-Al₂O₃ Powders Prepared form Metal Alkoxide Y. Hirata;H. Minamizono;K. Shimada
  19. ibid v.96 no.1 Preparation of Ultra Fine Mullite Powder from Metal Alkoxides H. Suzuki;Y. Tomokiyo
  20. Am. Ceram. Soc. Bull. v.56 no.11 Composition and Cell Dimensions of Mullite W.E. Cameron
  21. Am. Mineral. v.62 Mullite, A Substituted Alumina W.E. Cameron
  22. J. Am. Cerms. Soc. v.65 no.12 Critical Microstructure for Microcracking in Al₂O₃-ZrO₂ Composites D.J. Green
  23. ibid v.69 no.3 Exaggerated Grain Growth in ZrO₂-Toughened Alumina B. Kibbel;A.H. Heuer
  24. J. Mater. Sci. v.19 Microstructure and Mechanical Properties of Mullite/ZrO₂ Composites J.S. Moya;M.I. Osendi