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

SCRIPTA MATERIALIA

卷:194

Article

de Beauvoir, Thomas Herisson¹  Estournes, Claude¹ 

[1] Univ Toulouse 3 Paul Sabatier, CIRIMAT, CNRS INP UPS, 118 Route Narbonne, F-31062 Toulouse 9, France

关键词: Sintering;    Ceramics;    Alumina;   

DOI  :  10.1016/j.scriptamat.2020.113650

来源: Elsevier

【 摘 要 】

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 degrees C led to the release of OH groups and partial crystallization into boehmite gamma-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 intermediate boehmite phase, which is brittle due to its oriented layer structure. Further heat treatment in an oven at 500 degrees C induces the transformation of boehmite into gamma-Al2O3. Here we demonstrate the possibility to produce optically translucent ceramics of low temperature stability gamma alumina structure. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All right sreserved.

【 授权许可】

Free