Influence of the acrylamide-based monomer on the sintering of ceramics shaped by gelcasting

Laurie Gaüzère (1, 2) , Clémence Besnard (2) , Maël Pontoreau (1) , Stéphane Carlotti (3, 4) , Samuel Couillaud (2) , Jean-Marc Heintz (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Galtenco Solutions Company
3 LCPO - Laboratoire de Chimie des Polymères Organiques
4 Team 1 LCPO : Polymerization Catalyses & Engineering

Alumina ceramics were prepared by gelcasting, based on an in-situ polymerization that promotes the formation of homogeneous green ceramic parts and allows the preparation of complex shapes and/or large-size ceramics. The influence of the monomer on the sintering behaviour of alumina pellets has been studied by considering three acrylamide-based monomers, i.e. acrylamide (AM), methacrylamide (MAM) and dimethylacrylamide (DMAA). Slurries with an alumina solid content of 50 vol% have been cast and pre-sintered pellets (1000 • C) with relative densities around 55% were obtained. These presintered pellets exhibit different granular packing, depending on the initial monomer used, as demonstrated by X-ray tomography, SEM and Hg porosimetry analyses. This results in significant differences in sintering behaviour, giving rise to very different final densities after 1 h sintering at 1530 • C: from 88% to 98%. This behaviour is described in terms of shrinkage rate, linked to the granular packing induced by the gelation process.

Mots clés: Alumina; Gelcasting; Grain packing; Green microstructure; Sintering

Domaines: Matériaux

Laurie Gaüzère, Clémence Besnard, Maël Pontoreau, Stéphane Carlotti, Samuel Couillaud, et al.. Influence of the acrylamide-based monomer on the sintering of ceramics shaped by gelcasting. Open Ceramics, 2023, 16, pp.100447. ⟨10.1016/j.oceram.2023.100447⟩. ⟨hal-04199163⟩