Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Flaky α-Al2O3 Crystals by Transition Metal Salts Addition

전이금속염 첨가에 의한 판상 α-Al2O3 결정체 제조

  • Song, Hyo-Kyung (Center of Chemical Engineering, Korea Research Institute of Chemical Technology) ;
  • Park, Byung-Ki (Center of Chemical Engineering, Korea Research Institute of Chemical Technology) ;
  • Lee, Jung-Min (Center of Chemical Engineering, Korea Research Institute of Chemical Technology)
  • 송효경 (한국화학연구원 화학공정 연구센터) ;
  • 박병기 (한국화학연구원 화학공정 연구센터) ;
  • 이정민 (한국화학연구원 화학공정 연구센터)
  • Published : 2005.06.01
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Abstract

[ ${\alpha}-Al_2O_3$ ] precursor was synthesised by sol-gel method using aluminum sulfate, sodium sulfate and sodium carbonate as law materials. The flaky ${\alpha}-Al_2O_3$ crystals were prepared by heating using precursor about $1,050^{\circ}C$. In this study, the effect of some transition-metal sulfate ($FeSO_4,\;SnSO_4,\;ZnSO_4$) addition have been investigated. When iron sulfate was added, it could see that act on impurities in crystal growth process. In case of tin sulfate, distribution of Platelets was very broad. When flaky ${\alpha}-Al_2O_3$ crystals were prepared zinc sulfate addition, thickness, size, and distribution of platelets was suited to industrial application. The average diameter of flaky ${\alpha}-Al_2O_3$ crystals was about 20 $\mu$m, and its thickness was about 0.3 $\mu$m. Increasing addition of zinc sulfate, thickness of ${\alpha}-Al_2O_3$ platelet was decreased.

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References

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