Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Mullite Precursor Using Silicic Acid Extracted by Tetrahydrofuran from Sodium Silicate

규산나트륨으로부터 Tetrahydrofuran으로 추출된 규산을 이용한 Mullite 전구체 제조

  • 노재성 (충남대학교 공과대학 정밀공업화학과) ;
  • 홍성수 (호서대학교 공과대학 재료화학공학부) ;
  • 이범재 (충남대학교 공과대학 정밀공업화학과) ;
  • 이병기 (충남대학교 공과대학 정밀공업화학과) ;
  • 박은희 (충남대학교 공과대학 정밀공업화학) ;
  • 정홍호 (충남대학교 공과대학 정밀공업화학과)
  • Published : 1996.08.01
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Abstract

Fine mullite precursor was prepared by colloidal sol-gel processes. Aluminum isopropoxide $[Al(i-OC_3H_7)_3]$ as a starting material of $Al_2O_3$ and silicic acid extracted by THF from sodium silicate as a starting material of $SiO_2$ were used. Sodium silicate was first acidified by dilute sulfuric acid to form silicic acid. ; followed by extraction using THF, Mullite precursor was synthesized by sol-gel processes from aluminum isopropoxide and sillicic acid considering the degree of extraction of Si and the removal efficiency of Na. The impurity content of silicic acid extracted by THF was below 0.04% Synthetic mullite precursor consisted of $3Al_2O_3{\cdot}2SiO_2$ and showd spherical particles of $0.05{\mu}m$ diameter and below 0.462% of impurites. The mullite precursor was characterized by EDS, XRD, TG/DSC SEM, FT-IR spectroscopy ICP and TEM.

콜로이드 졸-겔법에 의해 초미립자 mullite 분말을 제조하였다. Al2O3의 출발 물질로 aluminum isopropoxide $[Al(i-OC_3H_7)_3]$을, $SiO_2$ 출발 물질로 규산 나트륨으로부터 tetrahydrofuran(이후 THF로 약기함)으로 추출한 규산을 사용하였다. 규산 나트륨은 규산을 생성시키기 위하여 묽은 황산으로 산성화시킨 다음 THF로 추출하였다. Mullite 분말은 졸-겔법에 의해서 Si 추출율와 Na 제거율을 조사한 규산과 aluminum isopropoxide로 부터 합성되었다. THF로 추출한 규산의 불순물 함량은 0.04% 이하이었다. 합성된 mullite 분말은 $3Al_2O_3{\cdot}2SiO_2$ 조성을 갖고 불순물의 함량은 0.0462% 이하의 직경 $0.05{\mu}m$ 정도의 결정상이었다. EDS, XRD, TG/DSC, SEM, FT-IR, ICP, TEM등으로 mullite 분말의 특성을 조사하였다.

Keywords

References

  1. High Temperature Oxides Mullite R.F. Davis;J.A. Pask
  2. Trans. J. Brit. Cer. Soc. v.72 no.279 Microwave Dielectric Properties of Mullite G.S. Perry
  3. J. Am. Ceram. Soc. v.60 no.3-4 High-Temperature Mechanical Properties of Mullite under Compression P.C. Dokoko;Joseph A. Pask
  4. 요업학회지 v.31 no.3 Fabrication of Porous Mullite Ceramics and Its Properties 김병훈;나용한
  5. J. Am. Ceram. Soc. v.61 no.3-4 Reexamination of the Kaolinite-to-Millite Reaction Series A.K. Chakraborty;D.K. Ghosh
  6. 요업학회 추계총회 초록집 v.25 A Study on the Sintering Characteristic of Mullite Prepared from Condensed Ethyl Silicate 노재성;이신영;서신석
  7. 요업학회지 v.26 no.3 Low-Temperature Synthesis of Mullite Powders by the Emulsion Technique 한상훈;이희수;송승룡
  8. J. Polym. Sci. Polym. Chem.(Ed.) v.21 Preparation of Ploysiloxanes from Silicic Acid. III Y. Abe;T. Misono
  9. J. Polym. Sci. Polym. Lett. (Ed.) v.22 Preparation of Ploysiloxanes from Silicic Acid VI Y. Abe;T. Misono
  10. J. Polym. Sci. Polym. Chem. Ed. v.22 Preparation of Ploysiloxanes from Silicic Acid. VIII Y. Abe;N. Shintani;T. Misono
  11. J. Polym. Sci. Polym. Chem. Ed. v.25 Preparation of Ploysiloxanes from Silicic Acid. IX Y. Abe;A. Kaijou;N. Shintani;Y. Nagao;T. Misono
  12. J. Polym. Sci. Polym. Chem. Ed. v.18 Silylation of Water Glass. I. S. Kohama;H. Inoue;T. Yasuda
  13. Nippon Kagaku Kaishi v.7 Preparation of Polysiloxanes by the Silylation of Silicic Acid Extracted with Tetrahydrofuran Y. Abe;T. Misono
  14. J. Am. Ceram. Soc. v.55 no.2 Infrared Frequency Caculations for Ideal Mullite K.J.D. Mackenzie