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Thermal Transformation of Transition Aluminas

  • Process and Extractive Metallurgy
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Abstract

This paper records conventional (CTEM) and scanning (STEM) microstructural examination of four transition aluminas (γ, δ, χ and κ) prepared from beohmite and hydrargillite. Bright and dark field images, and diffraction on a selected area (3 nm), show that the hydrargillite sequence transforms at 500°C, to ϰ alumina formed from a collection of slightly misoriented 6 to 8 nm microdomains. A very fast sintering to 100 nm microcrystals is observed upon heating at 950°C

In the boehmite branch, γ and δ alumina (50 to 100 nm) platelets often display well-defined diamond shaped outlines, oriented along the axis of the spinel structure. These platelets are constituted of irregularly shaped and sized microdomains (3 to 20 nm) with considerable misorientation. The moderate sintering at 950°C and the stability of Y alumina is attributed to this misorientation.

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Authors
  1. H. Dexpert
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  2. J. F. Larue
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  3. I. Mutin
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  4. B. Moraweck
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  5. Y. Bertaud
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  6. A. Renouprez
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Additional information

H. Dexpert is currently with L.U.R.E. in France.

Y. Bertaud is currently with Aluminium Pechiney in France.

J.F. Larue, I. Mutin, B. Moraweck and A. Renouprez are currently with the Institut de Recherches sur la Catalyse in France

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Dexpert, H., Larue, J.F., Mutin, I. et al. Thermal Transformation of Transition Aluminas. JOM 37, 17–21 (1985). https://doi.org/10.1007/BF03258733

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  • DOI: https://doi.org/10.1007/BF03258733

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