C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/624 (2006.01)
Patent
CA 2575052
The invention relates to a method of obtaining porous ceramics.More specifically, the invention relates to a method of producing a porous ceramic piece, comprising the following successive steps: (a) preparation of a mixture M containing a suspended ceramic powder, at least one gelling agent and at least one foaming agent, at a mixing temperature greater than the gelling temperature of the gelling agent; b) shearing of mixture M at a foaming temperature greater than the gelling temperature, until a foam is obtained; c) gelling of the foam, consisting in cooling mixture M to a temperature lower than the gelling temperature of the gelling agent and d) drying of the gelled foam such as to obtain a preform. According to the invention, a stabilising agent is added to mixture M, said agent having a viscosity which increases by at least a factor ten when a shearing speed of the stabilising agent falls from 100 s-1 to 0 s-1.
Procédé de fabrication d'une pièce céramique poreuse comprenant les étapes successives suivantes : a) préparation d'un mélange M contenant une poudre céramique en suspension, au moins un agent gélifiant et au moins un agent moussant, à une température de mélange supérieure à la température de gélification de l'agent gélifiant ; b) cisaillement du mélange M à une température de moussage supérieure à la température de gélification, jusqu'à obtention d'une mousse ; c) gélification de la mousse par refroidissement du mélange M à une température inférieure à la température de gélification de l'agent gélifiant ; d) séchage de la mousse gélifiée de manière à obtenir une préforme. Selon l'invention, on ajoute au mélange M un agent stabilisant dont la viscosité augmente d'au moins un facteur dix quand une vitesse de cisaillement de l'agent stabilisant diminue de 100 s-1 à 0 s-1.
His Christian
Mercier Emmanuel
Tardivat Caroline
Villermaux Franceline
Robic
Saint-Gobain Centre de Recherches Et D'etudes Europeen
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