Method for preparing a porous structure using silica-based...

C - Chemistry – Metallurgy – 04 – B

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C04B 38/08 (2006.01) B01D 53/94 (2006.01) C04B 35/565 (2006.01)

Patent

CA 2616922

The invention concerns a method for making a honeycomb-type silicon carbide porous structure, said method being characterized in that it includes the following steps: forming a paste from a mixture of silicon carbide grains whereof the diameter d50 ranges between 5 µm and 300 µm, of an organic binder, in the form of silica-based particles whereof the global porosity is higher than 70 %, shaping a crude honeycomb-shaped plastic monolith, drying said monolith and curing the monolith up to a temperature higher than 2100 °C. The structure obtained by the method may be used as catalytic support in a diesel or gas engine exhaust line or as particulate filter in a diesel engine exhaust line.

L'invention se rapporte à un procédé de fabrication d'une structure poreuse en carbure de silicium du type en nid d'abeilles, ledit procédé étant caractérisé en ce qu'il comprend des étapes de formation d'une pâte à partir d'un mélange de grains de carbure de silicium dont le diamètre d50 est compris entre 5 ~m et 300 ~m, d'un liant organique et d'un agent porogène inorganique, sous forme de particules à base de silice et dont la porosité globale est supérieure à 70 %, de mise en forme d'un monolithe plastique brut en forme de nid d'abeille, de séchage dudit monolithe et de cuisson du monolithe jusqu'à une température supérieure à 2100 ~C. La structure obtenue par le procédé peut être utilisée comme support catalytique dans une ligne d'échappement d'un moteur diesel ou essence ou comme filtre à particules dans une ligne d'échappement d'un moteur diesel.

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