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Article Dans Une Revue Scripta Materialia Année : 2020

Translucent γ-AlOOH and γ-Al2O3 glass-ceramics using the cold sintering process

Résumé

Cold Sintering Process has been applied to hydroxide precursors Al(OH) 3 , xH 2 O to promote in situ reactive sintering. The application of sintering temperatures < 400 °C led to the release of OH groups and partial crystallization into boehmite γ-AlOOH. This latter step is accompanied by a densification stage leading to the production of dense translucent pellet. From skeletal density measurements, it appears that not all the pellet is composed of crystalline phase, but contains a mix of amorphous and crystalline phase. The presence of amorphous phase seems to favor the mechanical stability of the samples made of the inter- mediate boehmite phase, which is brittle due to its oriented layer structure. Further heat treatment in an oven at 500 °C induces the transformation of boehmite into γ-Al 2 O 3 . Here we demonstrate the possibility to produce optically translucent ceramics of low temperature stability gamma alumina structure.

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Dates et versions

hal-03100689 , version 1 (06-01-2021)

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Thomas Hérisson de Beauvoir, Claude Estournès. Translucent γ-AlOOH and γ-Al2O3 glass-ceramics using the cold sintering process. Scripta Materialia, 2020, 194, pp.113650. ⟨10.1016/j.scriptamat.2020.113650⟩. ⟨hal-03100689⟩
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