control of the γ-alumina to α-alumina phase transformation for an optimized alumina densification
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2017
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Abstract
In this work, we studied the aptitude to sintering green bodies using γ-Al2O3 transition alumina as raw powder. We focused on the influence of the heating rate on densification and microstructural evolution. Phase transformations from transition alumina γ → δ → θ → α-Al2O3 were studied by in situ X-rays diffraction from the ambient to 1200 °C. XRD patterns revealed coexistence of various phase transformations during the heating cycle. DTA and dilatometry results showed that low heating rate leads to a significant reduction of the temperature of the α-Al2O3 alumina formation. Around 1190, 1217 and 1240 °C were found when using 5, 10 and 20 °C/min of heating rate, respectively. The activation energy for θ-Al2O3 → α-Al2O3 transformation calculated by Kissinger and JMA equations using dilatometry method were 464.29 and 488.79 kJ/mol, respectively and by DTA method were 450.72 and 475.49 kJ/mol, respectively. In addition, the sintering of the green bodies with low heating rate promotes the rearrangement of the grains during θ-Al2O3 → α-Al2O3 transformation, enhancing the relative density to 95% and preventing the development of a vermicular structure.
| Reference Key |
lamouri2017boletncontrol
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| Authors | ;Samir Lamouri;Mohamed Hamidouche;Noureddine Bouaouadja;Houcine Belhouchet;Vincent Garnier;Gilbert Fantozzi;Jean François Trelkat |
| Journal | medicinal chemistry (shariqah (united arab emirates)) |
| Year | 2017 |
| DOI |
10.1016/j.bsecv.2016.10.001
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