Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Fabrication of α-Alumina Nanopowders by Thermal Decomposition of Ammonium Aluminum Carbonate Hydroxide (AACH)

암모늄 알루미늄 탄산염(hhCH)의 열분해에 의한 α-알루미나 나노분말 제조

  • O, Yong-Taeg (Department of Advanced Materials Engineering, Chosun University) ;
  • Shin, Dong-Chan (Department of Advanced Materials Engineering, Chosun University) ;
  • Kim, Sang-Woo (Nano-Materials Research Center, Korea Institute of Science and Technology)
  • 오용택 (조선대학교 신소재공학과) ;
  • 신동찬 (조선대학교 신소재공학과) ;
  • 김상우 (KIST 재료연구부 나노재료연구센터)
  • Published : 2006.04.01
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Abstract

[ ${\alpha}-Al_2O_3$ ] nanopowders were fabricated by the thermal decomposition and synthetic of Ammonium Aluminum Carbonate Hydroxide (AACH). Crystallite size of 5 to 8 nm were fabricated when reaction temperature of AACH was low, $8^{\circ}C$, and the highest $[NH_4{^+}][AlO(OH)_n{(SO_4){^-}}_{3-n/2}][HCO_3]$ ionic concentration to pH of the Ammonium Hydrogen Carbonate (AHC) aqueous solution was 10. The phase transformation fem $NH_4Al(SO_4)_2$, rhombohedral $(Al_2(SO_4)_3)$, amorphous-, ${\theta}-,\;{\alpha}-Al_2O_3$ was examined at each temperature according to the AACH. A Time-Temperature-Transformation (TTT) diagram for thermal decomposition in air was determined. Homogeneous, spherical nanopowders with a particle size of 70 nm were obtained by firing the 5 to 8 m crystallites, which had been synthesized from AACH at pH 10 and $8^{\circ}C,\;at\;1150^{\circ}C$ for 3 h in air.

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References

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