Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Preparation of Ultrafine Mullite Powder from Metal Alkoxides

금속 알콕사이드로부터 Mullite 초미분체의 제조

  • Yim, Going (Dept. of Nanopolym. Mat. Eng., Col. of Eng., Paichai University) ;
  • Yim, Chai-Suk (Hyosung Corp., R & D.B. Labs, Cent. Res. Inst.) ;
  • Kim, Young-Ho (Doowon C & C Co., Tech. R & D Center)
  • 임굉 (배재대학교 나노고분자재료공학과) ;
  • 임재석 ((주)효성 기술원 중앙연구소) ;
  • 김영호 ((주)두원 C&C 기술연구소)
  • Published : 2006.12.27
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Abstract

Ultrafine mullite powder was prepared from aluminium-secbutoxide and tetraethyl orthosilicate(TEOS) in the molar $Al_2O_3/SiO_2$=3/2. Sol-gel method by partial hydrolysis technique, as it were, first, TEOS was partially hydrolysized and then mixed with Al-secbutoxide for complete hydrolysis was used. X-ray diffraction, infrared spectroscopy and transmission electron microscopy, etc. confirmed that the mullite powder prepared by this method is in the stoichiometric $Al_2O_3/SiO_2$ ratio. Al-Si spinel was formed at $980^{\circ}C$ and ultrafine mullite powder with about 20 nm particle size was obtained above $1,200^{\circ}C$. Also mullite powders calcined at $1,600^{\circ}C$ had a stoichiometric composition, $3Al_2O_3{\cdot}2SiO_2$ and the lattice constants of the mullite powders calcined above $1,200^{\circ}C$ were almost coincided with theoretical values.

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References

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