Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Low-Temperatrue Synthesis of Mullite Powders by the Emulsion Technique

MgO-Al2O3-SiO2계 요업원료의 제조 및 소결특성 -에멀젼법에 의한 Mullite분체의 저온합성-

  • 현상훈 (연세대학교 요업공학과) ;
  • 이희수 (연세대학교 요업공학과) ;
  • 송승룡 (연세대학교 요업공학과)
  • Published : 1989.03.01
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Abstract

Mullite powders were synthesized from the common solution of aluminum sulfate and sodium silicate solutions by the emulsion-hot kerosene technique. The reaction temperature and mechanism for mullitization and the characteristics of synthesized mullite powders were investigated. The effect of Na components introduced from sodium silicate solution on the physical property and microstructure of sintered mullite was also examined. It was proved that mullites were formed at 75$0^{\circ}C$ through the reaction mechanism of Na2O.2.2SiO2＋3.3Al2(SO4)3longrightarrow1.1(3Al2O3.2SiO2)＋Na2SO4＋8.9SO3. Synthetic mullite powders consisted of the compositiion of 3Al2O3.2SiO2 and showed highly agglomeration of hollow spherical particles of 1${\mu}{\textrm}{m}$ diameter. The density and fracture toughness of sintered mullites were somewhat reduced because of the effect of a very small amount of residual Na components.

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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. J.Am.Ceram.Soc. v.42 no.7 The Kaolinite Mullite Reaction Series: Ⅲ, The High-Temperature Phases G.W Brindley;M.Nakahira
  5. J.Am.Ceram.Soc. v.61 no.3-4 Reexamination of the Kaolinite-to-Mullite Reaction Series A.K.Chakraborty;D.K.Ghosh
  6. J.Am.Ceram.Soc. v.34 no.8 W.H.Bauer;I.Gordon
  7. J.Am.Ceram.Soc. v.55 no.11 Synthesis and Mechanical Properties Of Stoichiometric Aluminum Silicate(Mullite) K.S.Mazdiyasni;L.M.Brown
  8. Ceram.Int. v.18 Powder Synthesis from Metal-Organic Precursors K.S.Mazdiyasni
  9. Adv.Ceram.Mat. v.3 no.3 Sol-Gel Processing of Infrared Transparent Mullite Birol Sonuparlak
  10. J.Korean.Ceram.Soc. v.24 no.6 Preparation of Al₂O₃-ZrO₂Composite Powders by the Use of Emulsions : I.Thermodynamic Model of the Emulsion Stability S.H.Hyun;J.G.park;S.R.Song
  11. The chemistry of Silica R.K.Uer
  12. J.Korean.Ceram.Soc. v.25 no.3 Preparation of Al₂O₃-ZrO₂Composite Powders by the Use of Emulsion :Ⅱ. Emulsion-Hot Kerosene Drying Method S.H.Hyun;J.G.Paik
  13. J.Am.Ceram.Soc. v.55 no.2 Infrared Frequency Calculations for Idal Mullite(3Al₂O₃.2SiO₂) K.J.D.Mackenzie
  14. J.Am.Ceram.Soc. v.68 no.1 Sintering and Mechanical Properties of Stoichiometric Mullite S.Kanzaki;H.Tabata