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Interceram - International Ceramic Review

, Volume 65, Issue 7, pp 60–64 | Cite as

Preparation of Sphere-like α-Al2O3 from Commercial Al(OH)3 with a Mechanical Ball Milling Process

  • Lingling Zhu
  • Ying Zhou
  • Wei Li
  • Chunhui Sun
  • Shangxue Jun
  • Guotian Ye
Special Technologies

Abstract

In comparison to the typically worm-like α-Al2O3 powders of 20–30 µm size from unmilled Al(OH)3 precursor fired at 1450°C, almost-spherical α-Al2O3 powders of ∼0.5 µm size were synthesized from 9 h-milled Al(OH)3 precursor with the same heat treatment. The effect of the commercial Al(OH)3 precursor milling treatment on phase transformation and morphology of α-Al2O3 was studied by XRD and SEM. It was found that the milling treatment of the commercial Al(OH)3 precursor not only led ho an accleration of α-transformation during calcination, but also changed the morphology and particle size distribution of the α-Al2O3 powders. As the Al(OH)3 precursors were broken into irregularly shaped pieces with a ≤1 µm size range by the milling treatment, the resulting sharp corners with high vapor pressure would alter the evaporation-condensation mechanism into one that is mainly based on diffusion in the α-Al2O3 calcination process and promotes the tendency to form spherical α-Al2O3 powders.

Keywords

sphere-like alumina precursor milling treatment morphology modification 

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Copyright information

© Springer Fachmedien Wiesbaden 2016

Authors and Affiliations

  • Lingling Zhu
    • 1
  • Ying Zhou
    • 1
  • Wei Li
    • 2
  • Chunhui Sun
    • 1
  • Shangxue Jun
    • 1
  • Guotian Ye
    • 1
  1. 1.School of Materials Science and EngineeringZhengzhou UniversityZhengzhouChina
  2. 2.College of Basic Medical SciencesZhengzhou UniversityZhengzhouChina

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