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Sintering and crystallization of mullite powder prepared by sol-gel processing

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Abstract

Mullite powder with the stoichiometric composition (3Al2O3.2SiO2) was synthesized by a sol-gel process, followed by hypercritical drying with CO2. Within the limits of detection by X-ray diffraction, the powder was amorphous. Crystallization of the powder commenced at ≈1200 °C and was completed after 1 h at 1350 °C. In situ X-ray analysis showed no intermediate crystalline phases prior to the onset of mullite crystallization and the pattern of the fully crystallized powder was almost identical to that of stoichiometric mullite. The synthesized powder was compacted and sintered to nearly theoretical density below ≈1250 °C. The microstructure of the sintered sample consisted of nearly equiaxial grains with an average size of ≈0.2 μm. The effect of heating rate (1–15 °C min−1) on the sintering of the compacted powder was investigated. The sintering rate increased with increasing heating rate, and the maximum in the sintering curve shifted to higher temperatures. The sintering kinetics below ≈1150 °C can be described by available models for viscous sintering.

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References

  1. L. C. De Jonghe, M. N. Rahaman and C. H. Hsueh, Acta Metall. 34 (1986) 1467.

    Article  Google Scholar 

  2. M. N. Rahaman and L. C. De Jonghe, J. Amer. Ceram. Soc. 70 (1987) C-348.

    Article  Google Scholar 

  3. R. K. Bordia and R. Raj, ibid. 71 (1988) 302.

    Article  CAS  Google Scholar 

  4. W. H. Tuan, E. Gilbart and R. J. Brook, J. Mater. Sci. 24 (1989) 1062.

    Article  CAS  Google Scholar 

  5. M. N. Rahaman and D.-Y. Jeng, J. Mater. Sci., submitted.

  6. D.-Y. Jeng and M. N. Rahaman, J. Amer. Ceram. Soc., in press.

  7. K. S. Masdiyasni and L. M. Brown, ibid. 55 (1972) 548.

    Article  Google Scholar 

  8. B. L. Metcalf and J. H. Sant, Trans. J. Brit. Ceram. Soc. 74 (1975) 193.

    Google Scholar 

  9. H. Yamada and S. Kimura, J. Ceram. Soc. Jpn 70 (1972) 63.

    Google Scholar 

  10. B. B. Ghate, D. P. H. Hasselman and R. M. Spriggs, Amer. Ceram. Soc. Bull. 52 (1973) 670.

    CAS  Google Scholar 

  11. S. Kanzaki, H. Tabata, T. Kumazawa and S. Ohta, J. Amer. Ceram. Soc. 68 (1985) C-6.

    Article  Google Scholar 

  12. B. E. Yoldas, J. Mater. Sci. 12 (1977) 1203.

    Article  CAS  Google Scholar 

  13. M. N. Rahaman, L. C. De Jonghe, S. L. Shinde and P. H. Tewari, J. Amer. Ceram. Soc. 71 (1988) C-338.

    Google Scholar 

  14. S. Komarneni, Y. Suwa and R. Roy, ibid. 69 (1986) C-155.

    CAS  Google Scholar 

  15. C. J. Brinker and G. W. Scherer, J. Non-Cryst. Solids 70 (1985) 301.

    Article  CAS  Google Scholar 

  16. J. Zarzycki, M. Prassas and J. Phalippou, J. Mater. Sci. 17 (1982) 3371.

    Article  CAS  Google Scholar 

  17. G. W. Scherer, J. Non-cryst. Solids 87 (1986) 199.

    Article  CAS  Google Scholar 

  18. S. S. Kistler, J. Phys. Chem. 36 (1932) 52.

    Article  CAS  Google Scholar 

  19. G. A. Nicholson and S. J. Teichner, Bull. Soc. Chim. Fr. 58 (1968) 1906.

    Google Scholar 

  20. S. P. Mukherjee and J. C. Debsikdar, Amer. Ceram. Soc. Bull. 62 (1983) 413.

    Google Scholar 

  21. P. H. Tewari, A. J. Hunt and K. D. Lofftus, Mater. Lett. 3 (1985) 363.

    Article  CAS  Google Scholar 

  22. G. W. Scherer, J. Amer. Ceram. Soc. 60 (1977) 236.

    Article  CAS  Google Scholar 

  23. I. A. Aksay and J. A. Pask, ibid. 58 (1975) 507.

    Article  CAS  Google Scholar 

  24. J. A. Pask, Ceram. Int. 9 (1983) 107.

    Article  CAS  Google Scholar 

  25. J. K. Mackenzie and R. Shuttleworth, Proc. Phys. Soc. Lond. 62 (1949) 838.

    Google Scholar 

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Jeng, D.Y., Rahaman, M.N. Sintering and crystallization of mullite powder prepared by sol-gel processing. JOURNAL OF MATERIALS SCIENCE 28, 4904–4909 (1993). https://doi.org/10.1007/BF00361154

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