Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Precursor pH on Synthesizing Behavior and Morphology of Mullite in Stoichiometric Composition

화학양론 조성의 뮬라이트 합성거동과 입자형상에 미치는 전구체 pH의 영향

  • Lee, Jae-Ean (Department of Ceramic Science and Engineering, Changwon National University) ;
  • Kim, Jae-Won (Department of Ceramic Science and Engineering, Changwon National University) ;
  • Jung, Yeon-Gil (Department of Ceramic Science and Engineering, Changwon National University) ;
  • Chang, Jung-Chel (Power Generation Lab., Korea Electric Power Research Institute Korea Electric Power Co.) ;
  • Jo, Chang-yong (High Temperature Materials Group, Korea Institute of Machinery and Materials)
  • 이재언 (창원대학교 재료공학과) ;
  • 김재원 (창원대학교 재료공학과) ;
  • 정연길 (창원대학교 재료공학과) ;
  • 장중철 (한국전력공사 전력연구원 발전연구실) ;
  • 조창용 (한국기계연구원 내열재료그룹)
  • Published : 2002.07.01
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Abstract

Stoichiometric mullite ($3Al_2$$O_3$. $2SiO_2$) precursor sol has been prepared by sol-gel method. The effects of the precursor pH and sintering temperature on the synthesizing behavior and morphology of mullite have been studied. Mullite precursor sol was prepared by dissolution of aluminum nitrate enneahydrate (Al($NO_3$)$_3$.9H$_2O) into the mixture of silica sol. Precursor pH of the sols was controlled to acidic condition ($PH\leq$ 1~1.5) and to basic condition ($pH\geq$8.5~9). The synthesized aluminosilicate sols were formed under 20 MPa pressure after drying at $150^{\circ}C$ for 24 hours, and then sintered for 3hours in the temperature range of $1100~1600^{\circ}C$. From TGA/DTA analysis, total weight loss in the aluminosilicate gel of the acidic sample was (equation omitted) 56% and that of the basic sample was (equation omitted) 85%, indicating that the synthesizing temperature of mullite phase for acidic and basic samples was above $1200^{\circ}C$ and $1300^{\circ}C$, respectively. The morphologies of the synthesized mullite were fine and needle-like (or rod-like) for acidic sample, and granular for basic sample that has been sintered above $1300^{\circ}C$. It was found that the morphology of mullite particle was predominantly governed by precursor pH and sintering temperature.

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References

  1. P.C. Dokko, J.A. Pask, K.S. Nazdiyasni, J. Am. Ceram. Soc., 60 (3-4), 150 (1997) https://doi.org/10.1111/j.1151-2916.1977.tb15492.x
  2. R.R. Tummala, J. Am. Ceram. Soc., 74 (5),99 (1983)
  3. I.A. Aksay, D.M. Dabbs, M. Sarikaya, J. Am. Ceram. Soc., 74 (10),2343 (1991) https://doi.org/10.1111/j.1151-2916.1991.tb06768.x
  4. J. Klug and S. Prochaka, J. Am. Ceram. Soc., 70, 750 (1987) https://doi.org/10.1111/j.1151-2916.1987.tb04875.x
  5. K. Okada et al., Am. Ceram. Soc. Bull., 70, 1633 (1991).
  6. T.L Mah and K.S. Mazdiyashi, J. Am. Ceram. Soc., 66, 699 (1983) https://doi.org/10.1111/j.1151-2916.1983.tb10532.x
  7. Y.G. Choi, J. Kor. Cerm. Soc., 7, 773 (1999)
  8. Y. Hirata, K. Sakeda, V. Matsuchma, K. Schirnada, V. Ishihara, J. Am. Ceram. Soc., 72 (6),995 (1989) https://doi.org/10.1111/j.1151-2916.1989.tb06258.x
  9. D.W. Hoffman, R. Roy, S. Komarneni, J. Am. Ceram. Soc., 67, 468 (1984) https://doi.org/10.1111/j.1151-2916.1984.tb19636.x
  10. I. Jayrnes, A. Douy, D. Massiot, J.P. Coutures, J. Mater. Sci., 3, 4581 (1996) https://doi.org/10.1007/BF00366355
  11. S. Rajendran, H.J. Rossell, J.V. Sanders, J. Mater. Sci., 25,4462 (1990) https://doi.org/10.1007/BF00581109
  12. A.K. Chakraborty, J. Mater. Sci., 29, 6131 (1994) https://doi.org/10.1007/BF00354552
  13. G.M. Anilkumar, P. Mukundan, A.D. Damodaran, K. G. W. Warrier, Mater. Lett., 33, 117 (1997) https://doi.org/10.1016/S0167-577X(97)00090-6
  14. K. Okada and N. Otuska, J. Am. Ceram. Soc., 74, 2414 (1991) https://doi.org/10.1111/j.1151-2916.1991.tb06778.x
  15. J.S. Hong, X.X. Huang, J.K. Guo, Mater. Lett., 24, 327 (1995) https://doi.org/10.1016/0167-577X(95)00118-2
  16. K.C. Song, Mater. Lett., 35, 290 (1998) https://doi.org/10.1016/S0167-577X(97)00268-1
  17. B.L. Metcalfe and J.H. Sant, Trans. J. Br. Ceram. Soc., 74 (6), 193 (1975)
  18. J.W. Kim, H.C. Kim, D.H. Kim, S.M. Seo, C.Y. Jo, S.J. Choe and J.C. Kim, Kor. J. Mater. Res., 10 (3), 233 (2000)
  19. J.W. Kim, D.H. Kim, S.M. Seo, C.Y. Jo, S.J. Choe, J.C. Kim and Y.K. Park, Kor. J. Mater. Res., 9 (2), 1188 (1999)
  20. C.G. Ha, Y.G. Jung, J.W. Kim, C.Y. Jo, U. Paik, 'Effect of particle size on gelcasting process and green properties in alumina', Mater. Sci. & Eng. A., in press https://doi.org/10.1016/S0921-5093(02)00034-5
  21. H. Schneider, K. Okada, J.A. Pask, 'Mullite and Mullite Ceramics', John Wiley & Sons, 1994
  22. J. Temunjin, K. Okada, K.J.D. Mackenzie, Ceram. Inter., 25,85 (1999) https://doi.org/10.1016/S0272-8842(98)00005-4
  23. M.D. Sacks, H.W. Lee, J.A. Pask, 'A review of powder preparation methods and densification procedures for fabricating high density mullite', In: S. Sorniya, R.F. Davis, J.A. Pask (Eds.), 'Ceramic Transactions', Vol 6, 'Mullite and Mullite Matrix Composites', Am. Ceram. Soc., Westerville, OH, (1990)
  24. H. Schneider, B. Saruhan, D. Voll, 1. Merwin, A. Sebald, J. Euro. Ceram. Soc., 11,87 (1993) https://doi.org/10.1016/0955-2219(93)90062-V
  25. K. Okada, N. Otsuka, 'Formation process of mullite', In : S. Somiya, R.F. Davis, J.A. Pask (Eds.), 'Ceramic Transactions', Vol 61, 'Mullite and Mullite Matrix Composites', Am. Ceram. Soc., Westerville, OH, (1990)
  26. T.A. Ring, 'Fundamentals of Ceramic powder processing and synthesis', 340, Academic Press, 1996
  27. A. chakravorty, D.K. Ghosh, J. Am. Ceram. Soc., 71 (11), 978 (998) https://doi.org/10.1111/j.1151-2916.1988.tb07568.x